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• Graphics card artifacting

  - by White Phoenix

  This is my current build: EVGA X58 (first generation) motherboard Intel i7 965 @ stock clocks 3x 2GB DDR3-1600 Corsair RAM at stock timings and voltages Corsair AX750 80 Plus Gold PSU 1 Optical Drive 1 Seagate 7200.10 500 GB drive 2x Western Digital Caviar Black 1 TB drives OCZ Vertex 1 60 GB EVGA GTX 460 Antec 1200 case HT-Omega Striker 7.1 Sound Card Windows 7 32-bit Professional (PAE Enabled) My graphics card started artifacting while I was playing a game. It artifacted, the display blinked, then I got an NVIDIA driver has crashed and recovered message. Kept going, more artifacts, another crash, but this time my display blanked out and I couldn't do anything. Restarted my computer - artifacting is in the BIOS - got to Windows 7 but it BSOD'd before I could even log in. I restarted the computer again - artifacts cleared themselves out and I managed to get to Win7, but it soon started blinking in and out and artifacting again. Checked the card temps and they're well within range. (50 idle, 70 full load) The ambient temperature here is about 80-85F with high humidity. Tried Safe Mode and it still froze up/BSOD'd. Already tried the following to fix this problem: - Reseat the graphics card and swapped in a different slot. - Removed cover on card and sprayed with compressed air to clean it out. - Swapped around memory and/or went with only using one stick at a time. - Underclocked card I called EVGA Tech Support and they said that the voltage on the 12V rail of my Corsair AX750 PSU was on the high end of the "acceptable" range (12.4V, highest within acceptable range is 12.6V - optimal is obviously 12V). They gave me an RMA number anyway, but I want to get a second opinion from you all before I send this thing off, as shipping from where I live to EVGA is kind of pricey. This PSU is only 6 months old. So that I don't have to play RMA tag, which case would be most likely? I'm strapped for cash at the moment so I want to reduce the amount of RMAs I have to do since shipping is expensive here. Is there any surefire way to test to see if it's really the graphics card or the PSU? I tried unplugging any devices that were connected to the 12V rail (except for my SSD and graphics card) as I do have 3 mechanical hard drives, but the voltage for that rail didn't drop (it remained at 12.4V). I'm fairly sure it isn't the drivers since I'm getting the artifacting at the BIOS too. Right now I'm back in Windows 7 but I don't know for how long until it messes up again. Any ideas?

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• Managing hosts and iptables in scalable architecture

  - by hakunin

  Let's say I have a load balancer in front of 3 app servers. Let's say I also have these services available at certain IPs: Postgres server Redis server ElasticSearch server Memcached server 1 Memcached server 2 Memcached server 3 So that's 6 nodes at 6 different IP addresses. Naturally, every one of my 3 app servers needs to talk to these 6 servers above. Then, to make it a bit funkier, I also have 3 worker servers. And each worker also talks to the above 6 servers, but thankfully workers and apps never need to talk to each other. Now's the kicker. Everything is on Digital Ocean VPS. What that means is: you have no private network, no private IPs. You only have separate, random IP address on each machine. You can't mask them or anything. So in order to build a secure environment I would have to configure some iptables. For example: Open app servers be accessed by load balancer server Open redis, ES, PG, and each memcached servers to be accessed by each app's IP and each worker's IP This means that every time I add an app or worker I have to also reconfigure iptables in those above 6 servers to welcome the new app or worker. Is there a way to simplify this type of setup? I was thinking — what if there was a gateway machine between apps/workers and the above 6 machines. This way all the interaction would always happen via the gateway server, and when I add a new app or worker I wouldn't need to teach the 6 servers to let it in. If I went this route, then I'd hope a small 512mb server could handle that perhaps, and there wouldn't be almost any overhead. Or would there? Please help with best way to handle this situation. I would appreciate an answer as concrete as possible. I don't think this is too specific, because this general architecture is very common, and Digital Ocean is becoming increasingly popular. A concrete solution here would be much appreciated by many.

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• Why do I sometimes get 'sh: $'\302\211 ... ': command not found' in xterm/sh?

  - by amn

  Sometimes when I simply type a valid command like 'find ...', or anything really, I get back the following, which is completely unexpected and confusing (... is command name I type): sh: $'\302\211...': command not found There is some corruption going on I think. I don't use color in my prompt, I am using the Bash shell in POSIX mode as sh (chsh to /bin/sh and so on - $SHELL is sh). What is going on and why does this keep happening? Anything I can debug? I think this is more of an xterm issue than sh, or at least a combination of the two. Files, for context: My /etc/profile, as distributed with Arch Linux x86-64: # /etc/profile #Set our umask umask 022 # Set our default path PATH="/usr/local/sbin:/usr/local/bin:/usr/bin" export PATH # Load profiles from /etc/profile.d if test -d /etc/profile.d/; then for profile in /etc/profile.d/*.sh; do test -r "$profile" && . "$profile" done unset profile fi # Source global bash config if test "$PS1" && test "$BASH" && test -r /etc/bash.bashrc; then . /etc/bash.bashrc fi # Termcap is outdated, old, and crusty, kill it. unset TERMCAP # Man is much better than us at figuring this out unset MANPATH My /etc/shrc, which I created as a way to have sh parse some file on startup, when non-login shell. This is achieved using ENV variable set in /etc/environment with the line ENV=/etc/shrc: PS1='\u@\H \w \$ ' alias ls='ls -F --color' alias grep='grep -i --color' [ -f ~/.shrc ] && . ~/.shrc My ~/.profile, I am launching X when logging in through first virtual tty: [[ -z $DISPLAY && $XDG_VTNR -eq 1 ]] && exec xinit -- -dpi 111 My ~/.xinitc, as you can see I am using the system as a Virtual Box guest: xrdb -merge ~/.Xresources VBoxClient-all awesome & exec xterm And finally, my ~/.Xresources, no fancy stuff here I guess: *faceName: Inconsolata *faceSize: 10 xterm*VT100*translations: #override <Btn1Up>: select-end(PRIMARY, CLIPBOARD, CUT_BUFFER0) xterm*colorBDMode: true xterm*colorBD: #ff8000 xterm*cursorColor: S_red Since ~/.profile references among other things /etc/bash.bashrc, here is its content: # # /etc/bash.bashrc # # If not running interactively, don't do anything [[ $- != *i* ]] && return PS1='[\u@\h \W]\$ ' PS2='> ' PS3='> ' PS4='+ ' case ${TERM} in xterm*|rxvt*|Eterm|aterm|kterm|gnome*) PROMPT_COMMAND=${PROMPT_COMMAND:+$PROMPT_COMMAND; }'printf "\033]0;%s@%s:%s\007" "${USER}" "${HOSTNAME%%.*}" "${PWD/#$HOME/~}"' ;; screen) PROMPT_COMMAND=${PROMPT_COMMAND:+$PROMPT_COMMAND; }'printf "\033_%s@%s:%s\033\\" "${USER}" "${HOSTNAME%%.*}" "${PWD/#$HOME/~}"' ;; esac [ -r /usr/share/bash-completion/bash_completion ] && . /usr/share/bash-completion/bash_completion I have no idea what that case statement does, by the way, it does look a bit suspicious though, but then again, who am I to know.

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• Why Does My Windows 7 PC Freeze After Waking from Sleep?

  - by Blaenk

  Hey guys. I have Windows 7 running on my computer and everything is perfect. There's only one little problem. Sometimes when I leave my computer, I come back and my monitor is turned off or asleep, whichever it is. This is fine, I set it to do this. However, after turning on the monitor and moving the mouse around, the mouse cursor freezes; both the keyboard and mouse don't respond to anything, for example the keyboard's windows key won't bring up the start menu and moving the mouse around does not move the cursor around on the screen. I have to wait about a minute or two before things start working again. I figured this was a power savings setting problem, so I went into Control Panel Power Options. I only have Turn off Display = 30 minutes and Put Computer to Sleep = Never. Of course, I went into the advanced power settings to look through there. I put Never to turn off the hard disk, Sleep after never, and that's about it. Nothing else there looks like it might be causing this. I went into the device manager and checked the mouse and the keyboard, and they both have the Allow this device to wake the computer checked for both of them. Perhaps this other bit of information might help: Sometimes I VNC into my PC using my MacBook, and sometimes, as soon as it shows me the desktop, the same thing happens. The mouse won't move and VNC won't register any events on the server (Which is my PC of course). I close the client (And I know it has nothing to do with the client), then immediately restart it and try to connect. When I click the connect button, it hangs there, as if the PC is not responding. Basically it's like whenever I try to wake the computer from sleep, it does so by showing me the desktop, then it freaks out. Then again, I guess the computer isn't sleeping because the setting is set to 'Sleep after = Never'. I honestly don't know what's going on, would appreciate any insight. Thanks!

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• Unable to boot from LiveCD/USB and even Super Grub Disk!

  - by Reuben L.

  Hi all, I'm in a fix. Basically this morning, I decided to format my Win7 as it was getting really slow and I did so with no problems. I also have a Linux Mint OS on dual boot. Since I was springcleaning my windows partition, I decided it was a good idea to do the same to my linux partition. I downloaded the latest version of Linux Mint (Julia) and burned the LiveCD. Now here is where the problem lies, when I restarted Windows and chose to boot from the LiveCD, it didn't work. No joke. There was just a little underscore blinking for a long time before it went back to GRUB which prompted me to select an OS to boot. However, when I went into my old Linux Mint OS and restarted the machine, the LiveCD worked... to a certain extent. It would load and look as though it was ready to install Linux Mint 10 but the moment it got to the option screen, the whole screen turned into a checkered and jumbled mess. At this point I thought it was the LiveCD or the .iso file. I had an Ubuntu LiveUSB for recovery purposes and I tried that. The exact same thing happened. Can't boot the LiveUSB if I restarted from Windows, but works when I reboot from Linux. BUT still the same checkered screen that doesnt respond. Did a bit of googling and reckoned it might be something wrong with my GRUB. Did some updating and didnt make a difference. Then I tried the Super Grub Disk and STUPIDLY uninstalled GRUB. (Note that booting to SGD had the exact same problem - can't be done if I rebooted from Windows). Now I can't access my Linux Mint 9 cos the the bootup screen (mbr) only has Windows 7 as an option. Remember me mentioning that I can't boot from any CD/USB/recovery CD when I reboot from Windows? And now that I can't access Linux, there's no way for me to do any form of recovery! I've tried using the command prompt utility at startup recovery but to no avail. Anyone can help me with this?

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• How do I (robustly) remotely execute tasks on Windows workstations in a domain?

  - by Zac B

  I'm not even sure if "robustly" is a word. Anyway. Context: We have a few hundred Windows 7 workstations on a LAN. We use AD/GPO management pretty heavily, but there are a lot of periodic and/or manual maintenance tasks we need to do that can't be done via GPO/scheduled task. For example, say I want to execute program X (which runs silently, in the background, and doesn't bother the user) on workstation Y, or say I want to execute task A on a workstation group B either on a schedule or on demand. Kicking the users off of their computers to do this (i.e. using RDP) is a no-no, and doesn't work on groups anyway. Question: What's the best way to do this that is robust enough that, after setup, I could give it to beginner support people (read: people who are phobic of the command line, and get confused with GUI interfaces more complicated than Firefox)? I'm a competent programmer, and, if there is a robust set of tools or framework out there for this type of task, I'd consider hacking something together myself if it didn't take too long. If there's some combination of tools or techniques that others use to make remote-workstation-administration doable by beginners, I have yet to find it. For those who care about the "why": I'm midlevel IT, and was told to implement a remote management solution that allows arbitrary/scheduled remote execution, with confirmation that programs actually ran remotely, and the ability to view what they returned. "Why?" I asked, "Can't I just use PsExec and the task scheduler on a dispatcher machine?" "No," I was told, "'Joe' the second-week tech is going to be in charge of this one, and he needs something simple with a GUI." What I've tried: I've played with making a bunch of one-clickable "transfer files to remote computer and run them with PsExec" batch/VB scrips, but those tend to break down and don't easily support running on customizable groups. I've played a little bit with the Windows version of Puppet, but it doesn't support arbitrary-time remote execution (it's ability to group computers into a tree/node structure is really nice though). I've used an older version of Altiris, and, while it does a lot of what I want, it's interface is awful, it's slow, crashes a lot, and is probably too expensive for management. SwiftWater's DMS solution does some of what I want, but it's very underdeveloped, closed-source (not a deal breaker but not ideal), and I get the impression that support and reliability are lacking.

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• How to link specific ports to specific domains with Apache virtual hosts?

  - by theJoe

  We have a forward-facing linux box running Apache HTTP server that is acting as a reverse proxy for several back-end servers. The servers are accessed through specific domain names and ports and are set up as virtual hosts within Apache as such: Listen 8001 Listen 8002 <Virtualhost *:8001> ServerName service.one.mycompany.com ProxyPass / http://internal.one.mycompany.com:8001/ ProxyPassReverse / http://internal.one.mycompany.com:8001/ RewriteEngine On RewriteCond %{REQUEST_METHOD} ^(TRACE|TRACK) RewriteRule .* - [F] </Virtualhost> <Virtualhost *:8002> ServerName service.two.mycompany.com ProxyPass / http://internal.two.mycompany.com:8002/ ProxyPassReverse / http://internal.two.mycompany.com:8002/ RewriteEngine On RewriteCond %{REQUEST_METHOD} ^(TRACE|TRACK) RewriteRule .* - [F] </Virtualhost> The proxy server has only one IP address, and both domains are pointing to it. Accessing internal.one via service.one works fine, as does accessing internal.two via service.two. Now the problem is that Apache does not take the requesting domain into account when accessing the virtual hosts. What I mean is that both domains work for both ports: requests for service.one:8002 proxies to internal.two:8002, and requests for service.two:8001 proxies to internal.one:8001, where ideally both these requests should be denied. I can get around this by creating more virtual hosts that explicitly deny these requests: NameVirtualHost *:8001 NameVirtualHost *:8002 <Virtualhost *:8001> ServerName service.two.mycompany.com Redirect permanent / http://errorpage.mycompany.com/ </Virtualhost> <Virtualhost *:8002> ServerName service.one.mycompany.com Redirect permanent / http://errorpage.mycompany.com/ </Virtualhost> But this is not an ideal solution, since we plan to add more services to the proxy, and each new port would need to be explicitly denied on all the other domains, and each new domain would need to be explicitly denied on all ports it is not utilizing. As we add more services, the number of virtual hosts can get out of hand quickly. My question, then, is whether there is a better way? Can we explicitly tie specific ports to specific domains in a virtual host so that only that domain-port combination is processed, and all other combinations are not? Things I’ve tried: Adding NameVirtualHost *:8001, etc. without the additional virtual hosts. Setting ProxyRequests On and Off, as well as ProxyPreserveHost On and Off Adding the server name or IP address to the virtual host header, e.g. <VirtualHost service.one.mycompany.com:8001> Using the <proxy> directive inside the virtual host directive. Lots and lots of googling. The proxy server is running CentOS 6.2 64-bit, Apache HTTPD server 2.2.15. As mentioned, the proxy server has only one IP address, and all the domains we are using are pointing to it.

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• Deployment/provisioning tool for commercial applications (not developed in-house)

  - by mfinni

  I help manage a few hosted commercial applications, and we have a lot of manual processes involved when doing new customer-instance deployments into the shared (multitenant) environment. Allow me to describe the most relevant features, and then we can talk about the tools. We have an application on AIX, that requires dozens of changes to config files (some plain text, some XML) as well as a good number of commands to be run on multiple servers - some to start the new instance, some to restart our shared authentication and reporting engines, etc. The config changes follow templates, of course. The servers in question will also depend on the initial conditions specified by the implementer/deployer - we may choose to deploy a given customer to our servers in Europe, or one set of servers may be active-active whereas a different set of servers is active-passive - in short, there's a lot of complications. We have another application that run on IIS 6 and SQL. The DBAs don't want any automation of the SQL components and that's fine with me, but automating the IIS bit would be great. For a new customer instance, we make a filesystem copy of a template Virtual Directory target named after the new customer, make a new AppPool to match, edit a VirDir template .xml file to replace the filepaths and AppPool names with the new ones, and then make a new VirDir from the modified template XML to point to the new filesystem folder and app pool. For the first case, something like ControlTier or Chef might be good. For the second, the new(ish) Web Deploy from MS would probably do a good job. Has anyone used these tools or others to do something similar for applications? More of a nice-to-have, not a fixed requirement - Has anyone used anything that works on both platforms? I'm looking for something free, because the official word is that within a year, we will have whatever HP has renamed the OpsWare suite, which should be able to do stuff like this. Edit - based on someone's suggestion, looking at CFengine for the AIX application, it doesn't seem to address my pain. The problem isn't keeping a given config synced across dozens of servers, we have rsync for that. The problem is that onboarding a new customer instance touches dozens of files, putting pieces of the same or similar information into them - some are new stanzas in existing files, some are new files, and some are new directories. This is a several-hours-long process that is also error-prone because it's mostly done by hand. I guess I'm looking for config-file generation and management. I have built a small Perl script to do something similar for a much smaller case - it binds a CSV file into variables, and then does a copy-and-search-and-replace from a set of template config files. I could probably do the same here.

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• Virtualbox - routing subnet to bridge adapters

  - by user42384

  Hello, I have set up a Debian Lenny box with 3 vbox Lenny machines running eth0 of the host in bridged mode (on virtualbox 3.1.6). When testing in my local LAN, this all worked perfectly well and traffic flowed to and from the IPs of the virtual machines as it should. However, now that it's in its co-lo home, the networking setup is a bit different, and I'm unable to get traffic to flow to the vboxes properly. Specifically, the host has its own Primary IP, and I have a separate subnet of 8 (6 usable) IPs routed to the box for use by the vboxes. So, eth0 on host is: Machine IP: 2x.x.x.137 Gateway IP: 2x.x.x.138 Subnet Msk: 255.255.255.252 Subnet for vboxes is Subnet: 2x.x.x.240/29 Netmask: 255.255.255.248 vbox1 is configured to 2x.x.x.241 on eth0 as follows: auto eth0 iface eth0 inet static address 2x.x.x.241 netmask 255.255.255.248 Setting up a virtual interface (eth0:0) on the host with one of these subnet IPs allows me to ping to that address only from vbox1, and it allows me to ping vbox1 from the host. I can also ping that virtual interface perfectly well from outside, so the IPs are definitely landing at my machine. It seems I'm missing some sort of routing instruction either on the host or vbox1 to get traffic moving between the subnet and the default gateway, but I can't seem to figure out what it should be, or what glaringly obvious thing i'm missing. Most of my obvious attempts (the gw of eth0, the ip of eth0) were rejected by route command with SIOCADDRT: No such device (eg - i can't find it). I tried setting vbox1 to bridge on eth0:0, but this was not an acceptable device name and VBoxHeadless refused to start. The physical machine does have an unused physical NIC at eth1 that can be used if necessary for something or other. Host machine is running iptables configured by ferm, have experimented with it allowing forwarding for that subnet, but I wouldn't have thought this was necessary given the nature of the virtualbox devices (nor did it actually work). Clearing out all of these rules for a blank iptables set does not resolve the issue. (you can see ferm generated iptables at http://codedumper.com/ojaze) Thanks for any help you can give... Patrick

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• Win-XP Browsers Hang on page load - (waiting for...)

  - by CHarmon

  Hello, I’m having problems with my browsers hanging on loading pages on my desktop machine. I’m using Windows XP Pro with SP3 and fully updated except for IE 8. All three of my browsers, IE 7, Chrome and Firefox are having the same problems. Pages are not being loaded and are hanging on “waiting for …”. The browsers are waiting for the page being loaded or ad servers. Sometimes a page will load but the loading graphic continues to be displayed as if the page were still loading when the page appears to be fully loaded. The problem is bad enough that I can’t really use any of my browsers. I can eventually get most pages to load by stopping and restarting the page load. I have DSL modem with a wireless router and I have been able to eliminate the modem and router from being the source of my problem. My laptop doesn’t have any problems even when hardwired to the router and with the wireless connection disabled. I deleted the NIC and let XP re-install. Also tried a different network cable. Tried the same router port used in the laptop test. One clue that may be important is that I can’t connect to my router using the desktop machine…the page hangs while trying to connect. I can ping the router and I can quickly connect to the router using the laptop. I also can’t use the Windows update process – the page never fully loads. The problem affects other user accounts and even happens in safe mode. I am convinced the problem is with part of the O/S…some layer able to affect all of the browsers. The purpose of this post is to see if anyone has some ideas before I do a XP repair. I have done quite a bit of trouble-shooting: Ran a full anti-virus scan with AVG – no problems. Ran full scans with Spybot, MalwareBytes and Sophos anti-rootkit – no problems. Ran Chkdsk with both options checked. Ran Disk Clean up Defragged RE-installed IE7 Cleared all the browser caches Ran Ccleaner (registry tool) Ran HijackThis – nothing unusual (problem happens in safe mode too) Ran Process Explorer – no unusual processes Used System Restore and fell back several days – no change in the problem Booted to last known good configuration – no change in the problem Ran MicrosoftFixit50199.msi – no change in the problem Any ideas or suggestions would be appreciated…I’m not looking forward to doing a repair on XP. Thanks in advance for any help.

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• What are the most likely bottlenecks determining the performance of CamStudio screen recording?

  - by Steve314

  When doing screen recording, I can get a frame rate of maybe 15 frames per second for the full screen on my 1080p monitor using the XVID codec. I can increase the speed a bit by recording a region, changing screen modes, and tweaking other settings, but I'm curious what hardware upgrades might give me the biggest bang for my buck. My PC is budget, but modern... Athlon 2 X4 645 (3.1GHz, quad core, limited cache) processor. 4GB single channel DDR3 1066 RAM. ASRock motherboard with NVidia GeForce 7025/nForce 630a Chipset. ATI Radeon HD 5450 graphics card - 512MB on board, not configured to steal system RAM. I dual-boot Windows XP and Windows 7. For the moment, XP is my bigger performance concern as it's still my getting-things-done O/S as opposed to my browser-host O/S. My goal is to make a few programming-related tutorials. For a lot of that I don't need screen recording - I can make up some slides, record audio with the PC switched off, yada yada. When I do need screen recording, I'll mostly be recording Notepad++, Visual Studio or a command prompt. Occasionally, I may be recording some kind of graphics or diagram program and using my pre-Bamboo cheap Wacom tablet - I have the CS2 versions of Photoshop and Illustrator, but I'd much more likely be using Microsoft Paint. Basically, what I'll be recording won't be making huge demands on the machine - but recording a fair number of pixels (720p preferred) will be useful. What's particularly wierd - not so long ago I still had a five-year-old Pentium 4 based PC. And (with the same 1080p monitor) it could record at not far from the same frame rate. So clearly the performance issues are more subtle than just throw-money-at-it. My first guess would be that the main bottleneck is the bandwidth for transferring data to/from the graphics card. Is that likely to be correct? In support of that, see this [Radeon HD 5450 review][1] - the memory bandwidth is only 12.8 GB/s. If you can't get data out of graphics memory quickly, you can't transfer it back to the system memory quickly. Apparently, that's slower than some top-end cards in 2002.

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• Problems with MGCP proxy creation

  - by Popof

  Hi, I'm trying to bypass my ISP router with my FreeBSD server (I've an optical connection so I've a RJ45 used to connect the box to WAN) Internet and TV are working fine (Using igmpproxy to forward TV stream) but I've a problem with phone. ISP's box is connected to the server which gives it a LAN address. The problem is that when the box builds MGCP packets (and especially SDP ones) it uses its LAN address. So I've think of writing an UDP proxy to handle MGCP and SDP packets in order to replace LAN address with server WAN address and then forward packet to WAN. Before starting coding I've captured stream packets using my server as a bridge between WAN connection and the ISP's box. And, in order to see if my solution is viable, I've tried to send those packets to the box using nemesis. I tried to send a packet (found in capture) containing an endpoint audit: AUEP 1447 aaln/[email protected] MGCP 1.0 F: A In the wireshark capture the box replied: 200 1447 OK A: a:PCMU;PCMA;G726-16;G726-24;G726-32;G726-40;G.723.1-5.3;G.723.1-6.3;G729;TELEPHONE-EVENT, fmtp:"TELEPHONE-EVENT 0-15,144,149,159", p:10-30, b:4-40, e:on, t:00, s:on, v:L;M;G;D, m:sendonly;recvonly;sendrecv;inactive;confrnce;replcate;netwtest;netwloop, dq-gi But when I use nemesis, I got an ICMP error: Port unreachable (Type 3, Code 3). To build this packet, WAN source address of the capture is replaced with my server LAN address, using the mgcp-callagent port (2727) and the packet is sent to the LAN address of the box at mgcp-gateway port (2427). The command I use is nemesis udp -S 192.168.2.1 -D 192.168.2.2 -x 2727 -y 2427 -P packet_to_send. I also tried an UDP scan to the box on callagent and gateway port: PORT STATE SERVICE 2727/udp open|filtered unknown 2427/udp closed unknown I found those results a little bit strange because it should be the 2427 port opened, as it was in capture. Internet Protocol, Src: <ISP MGCP Server>, Dst: <My WAN Address> User Datagram Protocol, Src Port: mgcp-callagent (2727), Dst Port: mgcp-gateway (2427) Does someone has any idea about how having my box responding to my requests ? Thanks in advance and sorry for my english.

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• Random Computer Crashes

  - by Josh W.

  Ok, here's a wierd one for you all. Occasionally my PC here at work will crash in a very peculiar way. My dual monitors will suddenly go blank as if there is no longer a video signal, the USB mouse light will go dark and mouse stays unresponsive, the keyboard lights will not change status when the appropriate keys are pressed (Num/Caps/Scoll Lock). The CD Tray WILL open and close. But the computer will not respond to a ping request. For all intents & purposes it's as if the computer is off, except it wasn't intentional by me. The power light and internal fans are still on and I've now lost any unsaved work. Now here's where it gets wierd. This PC is part of a batch of PC's we got from a local vendor who does our initial system builds. Mine, and 6 other co-workers PCs all have the same issue. Originally we thought it was a bad combination of hardware, but through trial and error the only thing we haven't eliminated are the OS, Mobo & CPU. The problem was so bad for some of them that they ended up going back to their 5 year old dinosaurs in order to get some work done, for me the problem isn't as bad, maybe once every other day or so, but still enough to bite me in the ass if I've forgotten my ritualistic pressing of CTRL-S every 1-5 minutes. In this case we've tried two different video cards, two different power supplies, two different memory configurations, running on a UPS/not on UPS, updating/rolling back video drivers, three different bios revisions. The only things we haven't swapped are the mobo & cpu, mainly because a new mobo means a new Hardware Abstraction Layer, ie re-install of windows and there's alot of other software on this PC that takes forever to reload by hand. There was a base image that our systems team created with all the drivers installed and the basic setup of software our company uses, but they then must customize the setup for us programmers so it takes a while to get a new configuration up and going. I'm a programmer by day and am usually pretty good at diagnosing computer problems whether through trial and error or not. We've pretty much exhausted all the ideas we can think of here, short of a new mobo/cpu. Was hoping someone out there might have anything else we can try.. Relevant Parts: OS: XP Pro 32-bit Motherboard: Intel DG41RQ CPU: Intel Core-2 Quad Q9400 @ 2.66GHz Current BIOS Version/Date Intel Corp. RQG4110H.86A.0014.2010.0306.1151, 3/6/2010 Dual LCD's, Viewsonic VG930m & Samsung SyncMaster 910v (other people have different models, but listed in case there's some very wierd problem with the signals being sent/received) PS/2 Keyboard USB Microsoft Intellimouse BIOS Versions Tried: R 0013 12/23/2009 R 0014 3/6/2010 Video cards Tried GeForce 8400 GS Radeon HD 4350 - ASUS EAH4350 Two Different Power Supplies a 380W & 550W Ram Configurations 2GB - 1 x 2GB 4GB - 2 x 2GB

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• APC PHP cache size does not exceed 32MB, even though settings allow for more

  - by hardy101

  I am setting up APC (v 3.1.9) on a high-traffic WordPress installation on CentOS 6.0 64 bit. I have figured out many of the quirks with APC, but something is still not quite right. No matter what settings I change, APC never actually caches more than 32MB. I'm trying to bump it up to 256 MB. 32MB is a default amount for apc.shm_size, so I am wondering if it's stuck there somehow. I have run the following echo '2147483648' > /proc/sys/kernel/shmmax to increase my system's shared memory to 2G (half of my 4G box). Then ran ipcs -lm which returns ------ Shared Memory Limits -------- max number of segments = 4096 max seg size (kbytes) = 2097152 max total shared memory (kbytes) = 8388608 min seg size (bytes) = 1 Also made a change in /etc/sysctl.conf then ran sysctl -p to make the settings stick on the server. Rebooted, too, for good measure. In my APC settings, I have mmap enabled (which happens by default in recent versions of APC). php.ini looks like: apc.stat=0 apc.shm_size="256M" apc.max_file_size="10M" apc.mmap_file_mask="/tmp/apc.XXXXXX" apc.ttl="7200" I am aware that mmap mode will ignore references to apc.shm_segments, so I have left it out with default 1. phpinfo() indicates the following about APC: Version 3.1.9 APC Debugging Disabled MMAP Support Enabled MMAP File Mask /tmp/apc.bPS7rB Locking type pthread mutex Locks Serialization Support php Revision $Revision: 308812 $ Build Date Oct 11 2011 22:55:02 Directive Local Value apc.cache_by_default On apc.canonicalize O apc.coredump_unmap Off apc.enable_cli Off apc.enabled On On apc.file_md5 Off apc.file_update_protection 2 apc.filters no value apc.gc_ttl 3600 apc.include_once_override Off apc.lazy_classes Off apc.lazy_functions Off apc.max_file_size 10M apc.mmap_file_mask /tmp/apc.bPS7rB apc.num_files_hint 1000 apc.preload_path no value apc.report_autofilter Off apc.rfc1867 Off apc.rfc1867_freq 0 apc.rfc1867_name APC_UPLOAD_PROGRESS apc.rfc1867_prefix upload_ apc.rfc1867_ttl 3600 apc.serializer default apc.shm_segments 1 apc.shm_size 256M apc.slam_defense On apc.stat Off apc.stat_ctime Off apc.ttl 7200 apc.use_request_time On apc.user_entries_hint 4096 apc.user_ttl 0 apc.write_lock On apc.php reveals the following graph, no matter how long the server runs (cache size fluctuates and hovers at just under 32MB. See image http://i.stack.imgur.com/2bwMa.png You can see that the cache is trying to allocate 256MB, but the brown piece of the pie keeps getting recycled at 32MB. This is confirmed as refreshing the apc.php page shows cached file counts that move up and down (implying that the cache is not holding onto all of its files). Does anyone have an idea of how to get APC to use more than 32 MB for its cache size?? **Note that the identical behavior occurs for eaccelerator, xcache, and APC. I read here: http://www.litespeedtech.com/support/forum/archive/index.php/t-5072.html that suEXEC could cause this problem.

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• Looking for personal scheduling software / todo list with rather particular requirements

  - by Cthulhu

  I've been scouring the web for a couple of (my boss') hours, looking for a piece of software that can organize my tasks in two ways. First, I have a list of bullet points / todo items I can do at any given time. Think of stuff like solve issue X, ask X about Y, write documentation about Z, etcetera. Second, I have a number of running projects I'd like to organize better, as in schedule for a certain part of a day of the week. Ideally (I think), my day would be organized as 50% spent on projects and 50% on the other small things. Now, I don't like most calendar applications (such as Outlook & friends), their UI is too 'official', not really easy to move stuff around (in my experience). I don't like most todo lists either, too static and things. I like new, fast and hip software. I've looked at GTD versions of Tiddlywiki, and I like mGSD for one particular feature. You can make lists of tasks and basically give them one of three statusses - Now (nothing required, you can do it right away), Waiting (you need someone or something before you can work on this), or the most gratifying of all, Done. I like that feature because it's a simple todo list, but indicates more accurately the things you can do right now and the things you depend on someone else for to do. Anyways, that's just a small aspect of that program - most of the other things in there I can't find a particularly good use for. If there's something like that (maybe something that works even snappier, cleaner UI), combined with an easy to use bit of scheduling software (optionally separated into two applications, but preferrably not), I think I'd like that. (Besides something like that, I also use several instances of Trac to monitor tasks and bugs and things for the various clients and projects I have to serve, and TaskCoach to monitor the amount of time I spend on each task / each client. An easy / low-maintenance time tracking software would be neat too) Of course, the software has to be free to use. I don't like shareware, trials, limited software and the like. I could develop my own too, but I'm lazy like that and there's a dozen other projects I'd like to do in my free time (neither of which I actually do). Edit: I like David Seah's printable CEO stuff, if something like that (with some video game / instant achievement / gratification) exists in software, it'd be awesome.

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• Why Photoshop CS5's photomerge's result immediately disappear?

  - by koiyu

  I have a bunch of JPG-files which I want to stitch together with Photoshop's Photomerge function. I choose File → Automate → Photomerge... and browse for the files. Photoshop opens the files and starts analyzing. I see the process bar filling and different phases are mentioned on the process bar. Nothing weird there. When the merging is done (and if I don't blink my eyes), I can see layers-palette is populated with the chosen files and, by quickly judging from the layer thumbnails, they're properly aligned. Sometimes the image window itself can be seen, but not always. Problem is that the layers and the image disappear in a flash. There is no error message. Everything is like prior starting the photomerge. No file has been changed. I could continue to use Photoshop normally. This is what I've tried so far: Loaded folder which has 38 JPG images, 4272 x 2848 and ˜ 5 megabytes per file Loaded the same files, but chose Use Files instead of Use Folder in the photomerge's window Loaded 19 JPG images, 4272 x 2848 and ˜ 5 megabytes per file Loaded 10 JPG images, ⇑ see above Loaded 5 JPG images, see above Loaded 3 JPG images, see above Scaled the images to 2256 x 1504 and ˜< 1 megabytes per file Loaded in a set of 38, 19, 10, 5, 3 Following steps are tested with these smaller files and with a set of 5 images Read Adobe's forums and reduced the amount of RAM Photoshop uses gradually from ˜ 80 % to 50 % (though I didn't understand the logic behind this) Would've reduced cache tile size to 128K, but it was set so already Disabled OpenGL Scaled the images to 800 x 533 and ˜ 100 kilobytes per file, loaded a set of 5 Read more unanswered threads around the internet In between each test I closed and reopened Photoshop. This is the first time I've even tried using photomerge. Am I doing something wrong? How can I locate what is the problem? How do I fix this? Photoshop is 64 bit Extended CS5 version. I'm on a mid-2010 quad-core (i5) iMac with up-to-date Mac OS X 10.6.6. Edit: Weird. First loading the images into one file via File → Scripts → Load Files into Stack… and then using Edit → Auto-Align Layers…, which, effectively, is the same as photomerge (even the dialog looks kind of the same), works! Even with the original JPGs without any issues. This doesn't fix photomerge, though.

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• System won't boot: Gigabyte HD 7790 1GB OC GPU issue or Corsair VS550 PSU issue?

  - by MGOwen

  Installed a new GPU, and PC won't boot. Turn it on and: No monitor signal at all (tried HDMI and VGA via DVI, on 2 working monitors). CPU and GPU fans DO spin, but No system beeps, no sounds from drives (they might make a small noise in the first 1 second or so, but there's definitely no OS loading or anything like that) If hit "power off" button it turns off immediately (no holding down for 3 seconds like usual) If I put my old HD 5670 GPU back in, everything works fine. But (plot twist!) card is not totally dead. My friend put it in his PC, and it works fine (he even played a game for 15 minutes, no issues). He has a Corsair TX850 850W and a Gigabyte MB. So my main theory is: the GPU isn't getting enough power from the PSU. But is it: Bad PSU? Seems unlikely, since it works fine with the other GPU. Also, the PSU Is brand new and 550W (single 42A/504W 12V rail). Overkill for this GPU. Corsair is a decent brand, but maybe just mine is faulty? Bad GPU? Could it be drawing more power than it should be, somehow, or something? Supposedly HD 7790 needs only 21A/75W on the 12v rail, though this one is factory overclocked a bit... but should that triple the power requirement? Something else? Could there be a motherboard incompatibility somehow? Both MB and GPU are less than a year old and PCI Express 3.0 x16. Things I've tried: Re-seating the video card Testing PC with old GPU (works fine, same PCIe slot). Checked AMD's stated amp/watt requirements of a 7790 and my PSU (see above). My PSU can output twice the amps (single rail) and 5x the Wattage a 7790 needs. Here are the full specs: Gigabyte HD 7790 1GB OC GPU Corsair VS550 550W PSU 4GB RAM AsRock H61M U3S3 motherboard i3-2100 500GB SATA HDD (2007-ish) blu-ray drive (new) PCI 802.11g card Edit: Motherboard BIOS Update seems to have fixed it. (If anyone has same problem and it doesn't work, comment here).

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• Trouble creating FTP in Server 2008

  - by Saariko

  I have been trying to create an FTP server on my new Server 2008. I have been following both (very detailed and highly published here guides) For setting up using IIS Manager http://learn.iis.net/page.aspx/321/configure-ftp-with-iis-7-manager-authentication/ and For anonymous FTP http://www.trainsignaltraining.com/windows-server-2008-ftp-iis7 I am able to log as an anonymous user. My need is to use a named user, so I need to use the IIS Manager. I get error 530 when trying to log as a user. Connected to 127.0.0.1. 220 Microsoft FTP Service User (127.0.0.1:(none)): ftpmanager 331 Password required for ftpmanager. Password: 530-User cannot log in. Win32 error: Logon failure: unknown user name or bad password. Error details: Filename: Error: 530 End Login failed. ftp> I can not learn from this message anything. My password is set to: 1234 (so I don't think I make a mistake here - testing purposes only ofc) Thank you. Note - I went over other posts on SE that I read, and couldn't get the result: IIS7 Windows Server 2008 FTP -> Response: 530 User cannot log in. FTP Error 530, User cannot log in, home directory inaccessible. Having trouble setting up FTP server on Windows Server 2008 EDIT I think I found some errors with the physical path. Going to Basic settings, and Test Connection on the physical path, gave me the following error: The server is configured to use pass-through authentication with a built-in account to access the specified physical path. However, IIS Manager cannot verify whether the built-in account has access. Make sure that the application pool identity has Read access to the physical path. If this server is joined to a domain, and the application pool identity is NetworkService or LocalSystem, verify that \$ has Read access to the physical path. Then test these settings again. I am not sure which/whom should get access to the Root folder !? I want to point out, I managed to login with a domain user (change authorization and authentication methods) but this is NOT the requested solution. I checked to make sure that the FTP, folders, access is working properly. I am bit lost here. ==== More tries: I have enabled another Allow rule for ALL Users. I still get the same error. It seems that it doesn't matter if i use a correct or wrong password, I still get Error 530.

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• Holding off Windows 2000/3 Server in Shutdown

  - by user1668993

  We have a C# VS2010 application running on a Windows 2000 Server box (there is also a Windows 2003 Server box) as pretty much the only application running. We remove power from the box. There is a short duration battery (maybe 3 minutes of power) which then waits 10 seconds and then decides things are coming down and notifies Windows that it needs to shut down. Windows sends a CTRL_SHUTDOWN_EVENT event to the application which fields it and tries to keep Windows from going down for a while to let another computer which communicates with this one time to do some file work on the first computer. It does this by a timing loop and after the loop is over, it exits gracefully and the computer shuts down. Nice plan but it doesn't work. The application gets to maybe 20 seconds and the application is forcibly killed by Windows and Windows shuts down. At 90 seconds, the hardware firmware running the battery turns off power to the computer. I have tried searching to find out how to hold off Windows for a bit of time. I tried creating (it wasn't there) the HKEY_LOCAL_MACHINE subtree: \SYSTEM\CurrentControlSet\Control\WaitToKillAppTimeout registry key to 60000 but though it seemed to keep the popup from happening, Windows itself died at about the same amount of time -- we think without having the opportunity to shut itself down gracefully. Maybe the registry key worked but wasn't enough. Basically I have an "ill-mannered" application which is refusing to shut down (for the best of reasons) and without the registry key thing, Windows eventually shuts it down anyway and then shuts itself down. With the registry change, we think what is happening is that Windows doesn't shut down the application but Windows itself is killed suddenly without shutting down but power is still not pulled for about another minute, and then power is pulled. So maybe we have layers here. First there is how long the application tries to stay open. Then there is how long Windows is prepared to allow it to stay open. Then there is ... something... which kills windows. Then there is the power loss. Anyone have any ideas how we can get windows to stay open and in operation say to 70 seconds instead of about 20? Is our registry key right, but not enough? Is there some additional key we need to set to determine how long after windows is notified of a shutdown before it just kills itself? Thanks in advance.

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• Hyper-V Ubuntu Networking Problems Copying Large Amounts of Data

  - by Anonymous

  I am trying to copy a large amount (about 50 GB) of data over my network from a Hyper-V-hosted virtual machine running Ubuntu 11.04 (Natty Narwhal) to another (non-virtual) Ubuntu host that I plan to use for testing upgrades to one of our web applications. The problem I am having is with the virtual machine, which I shall refer to in what follows as "source.host". This machine is running 64-bit Ubuntu Server with the 2.6.38-8-server kernel and the Microsoft Linux Integration Components for Hyper-V kernel modules (hv_utils, hv_timesource, hv_netvsc, hv_blkvsc, hv_storvsc, and hv_vmbus) loaded. It uses a Hyper-V "synthetic network adapter" for its networking interface. To do the copy, I log on to the machine with the data and run the following commands (Call the remote machine "destination.host".): $ cd /path/to/data $ tar -cvf - datafolder/ | ssh [email protected] "cat > ~/data.tar" This runs for a while and then suddenly stops after transferring somewhere from 2-6 GB. The terminal on the source.host machine displays a Write failed: broken pipe error. The odd part is this: after this occurs, the "source.host" machine is no longer able to talk to the rest of the network. I cannot ping any other hosts on the network from the "source.host" machine, and I cannot ping the "source.host" machine from any other host on the network. I am equally unable to access the any of the web services hosted on "source.host". Running ifconfig on "source.host" shows the network adapter to be up and running as usual with the correct IP address and everything. I tried restarting the networking service with $ /etc/init.d/networking restart but the problem does not go away. Restarting the machine makes it capable of talking to the network again -- it can ping and be pinged by other hosts, and the web services are also accessible and usable as normal -- but attempting the copy operation again results in the same failure, requiring another restart. As an experiment, I tried replacing the tar -- ssh pipeline above with a straight scp: $ scp -r datafolder/ [email protected]:~ but to no avail Thinking that the issue might have to do with the kernel packet-send buffers filling up, I tried increasing the buffer size to 12 MB (up from the 128 KB default) with # echo 12582911 > /proc/sys/net/core/wmem_max but this also had no effect. I'm guessing at this point that it might be a problem with the Microsoft synthetic network driver, but I don't really know. Does anyone have any suggestions? Thank you very much in advance!

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• Resetting root password on Fedora Core 3 - serial cable access only

  - by Sensible Eddie

  A little background: We have an old rackmount server running a customised version of Fedora, manufactured by a company called Navaho. The server is a TeamCAT, running some proprietary rubbish called Freedom2. We have to keep it going - the alternative is extraordinarily expensive, and the business is not likely to be running much longer to justify changing things. Through one means or another, it has fallen upon me to try and resolve our lack of root access. The previous admin has fallen under the proverbial bus, and nobody has any clue. We have no access to the root account for this server. ssh is running on the server, and there is one account admin that we can login with, however it has no permission to do anything (ironic...) The only other way into the server is with a null-modem serial cable. This works... up to a point. I can see the BIOS, I can see the post BIOS screen, and then I see "Starting grub", followed by another screen with about four lines of Linux information, but then it stops at that point. The server continues booting, and all services come online after around two minutes, but the serial terminal displays no more information. I understand it is possible to put Linux into "single user mode" to reset a root password, but I have no idea how to do this beyond trying to interrupt it at the grub stage listed above. When I have tried it just froze. It was almost like grub had appeared (since the server did not continue booting) but I couldn't see it on the serial terminal. Which made me think maybe the grub screen has some different serial settings? I don't know... it's the first time I've ever used serial for access! A friend of mine suggested trying to use a Fedora boot CD. We could boot from USB, so something along this approach is possible but again we still can only see what's going on with the serial terminal, so it might not be achievable. Does anyone have any suggestions for things I can try? I appreciate this is a bit of a long shot, but any assistance would be invaluable. *UPDATE 1 - 28/8/12 * - we will be making some attempts on this today and will post further details later!

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• Expendable, Redundant, Easily recoverable

  - by MeIr

  I am desperate at this point, I have been looking for "Big storage" solution for a while on my own and I can't find anything that would suite my needs. But now push came to shove. Current situation: I have about 6TB data storage (already full) - Drobo. Yesterday Drobo died on me and it put me into bad situation - I can't recover my data without buying another Drobo. From extensive research online I realized that Drobo is not the safest bet and by now it seems very poor choice. I ordered new Drobo to try to get my data back, however I don't want to be in the same situation later and continuing using Drobo promises this event to re-occur. What I am looking for: 1) Inexpensive setup. 2) Dynamically extendable - add more drives and/or replace a drive with bigger capacity. 3) Redundant - setup against 1-3 drive failure, will depend on total number of drives. For the sake of argument let's assume for every 4 drives one should be able to fail without data loss. 4) Easy data recovery - let's say unforeseen happens, I would like to be able to recover information without buying new tools or replacements - example: new Drobo. 5) Should be USB or Network Attach Storage 6) No demand on speed. Doesn't have to be fast, I am not doing video editing on the setup. However if option exists, would be nice to have a decent speed. After thoughts: I reviewed few options and FreeNAS looks nice, but it doesn't have #2 - Dynamic extendability. There are work around with Pools but it seems a bit complicated and unnecessary. More over it seems like data safety is a big question - saw some horror stories. Please advise on what options I have and what seems like an optimal solution (if any). I don't care if it has to be Windows or Linux box or any other OS and/or software that has to run on top, but simple solution is more attractive. Thank you! P.S: Feel free to ignore "After thoughts".

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• How to unmangle PDF format into a usable text or spreadsheet document?

  - by Chuck

  Upon requesting some daily/hourly sales data from a coworker who is responsible for such requests, I was given a series of PDF files. The point of sale program that is used, for some reason, answers requests for this type of information in the form of PDF files. The issue: The PDF files look to be in a format that should easily be copy and pasted into a spreadsheet. There are three columns that look to be neatly organized across two pages. When copy/pasting the first page, all three columns from the PDF's first page are dumped into a single column consisting of the Date followed by the Hours for the transactions on that day. The end of this Date/Time information is followed by all of the Total Sales values that should be attached a Date and Time of the transaction. (NOTE: There are no duplicated Dates in the Date column, ie, Multiple transactions for a day only have one yyyy/mm/dd listed for the first row but not the following rows.) While it was a huge pain, it was possible to, in about four or five steps, get the single column of data broken out into three columns that matched the PDF. The second page of the PDF file, when attempting to copy/paste into a spreadsheet, creates a single column with the first third of the cells being the Dates from the PDF, the second third of the cells being the Hours of the transactions and the final third of the cells being filled with the Total Sales. After the copy/paste there is no way to figure out which Hours belong to which Dates or Total Sales due to the lack of the duplicated Dates in the Date column as mentioned above. My PDF-fu is next to non-existent. I've just now started to work with PDF editors and some www.convertmyPDFforfree.com websites, so far, with absolutely nothing remotely coming anywhere near usable output. (Both methods have so far done nothing but product blank documents.) Before I go back and pester my co-worker into figuring out a way to create a report in some other format than PDF, is there any method by which to take the data that looks to be formatted correctly in a PDF and copy/paste it into a spreadsheet that will look the same? I appreciate any help that can be made available. The sales data isn't so sensitive that I couldn't part with a bit to let somebody actually see what it is that needs to be dealt with, just let me know. The PDF's are less than 100kb each so sending them shouldn't be a burden to any interested party.

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• Routing between 2 different subnets on 2 different interfaces in SonicOS

  - by Chris1499

  I'm having a bit of a problem allowing traffic between two of my subnets. Here's the structure I've built. The X0 interface has our windows server on it and it handles DHCP/DNS, etc. X1 has the WAN connection. The Sonicwall is handling DHCP on X2. The X3 interface is connected to a different vlan on the 48 port switch. The Sonicwall is handling DHCP on this network as well. So here's what i want to do. The network on X2 is for our guest wireless; i don't want it to be able to access any of the other networks, just the internet, so i that all blocked in the firewall. No issues there. The X3 network is going to be for programmable controllers, and needs to be able to access the X0 network where our computers are. This is where my problem is. I'm not able to get between the 192.168.2.xxx and the 192.168.1.xxx on interfaces X0 and X3 respectively. I have these rules set up in the firewall. The Lan Primary Subnet is the 192.168.2.0 on X0. So if i'm not mistaken, this will allow traffic between the two through the firewall. Now this is where I'm a little confused. Do i need to use NAT to get the traffic from X0 to go to X3 (and vice versa), or a static route, or both? Currently i have both, though i doubt they're done correctly (also in screenshot). I've tried to ping between the two without luck. Any advice, or if you see what's wrong with my setup, is much appreciated. If you need some more information, let me know. Thanks all! EDIT: So i found that i don't neither either NAT or a static route, that the setting in the firewall is enough. I can now ping from the 192.168.1.xxx network, however i can't access the server on the 192.168.2.xxx network. When i try to access i get "An error occured while reconnecting to Z: to server Microsoft Windows Network: The local device name is already in use. This connection has not been restored. What am i missing?

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• What happens to missed writes after a zpool clear?

  - by Kevin

  I am trying to understand ZFS' behaviour under a specific condition, but the documentation is not very explicit about this so I'm left guessing. Suppose we have a zpool with redundancy. Take the following sequence of events: A problem arises in the connection between device D and the server. This causes a large number of failures and ZFS therefore faults the device, putting the pool in degraded state. While the pool is in degraded state, the pool is mutated (data is written and/or changed.) The connectivity issue is physically repaired such that device D is reliable again. Knowing that most data on D is valid, and not wanting to stress the pool with a resilver needlessly, the admin instead runs zpool clear pool D. This is indicated by Oracle's documentation as the appropriate action where the fault was due to a transient problem that has been corrected. I've read that zpool clear only clears the error counter, and restores the device to online status. However, this is a bit troubling, because if that's all it does, it will leave the pool in an inconsistent state! This is because mutations in step 2 will not have been successfully written to D. Instead, D will reflect the state of the pool prior to the connectivity failure. This is of course not the normative state for a zpool and could lead to hard data loss upon failure of another device - however, the pool status will not reflect this issue! I would at least assume based on ZFS' robust integrity mechanisms that an attempt to read the mutated data from D would catch the mistakes and repair them. However, this raises two problems: Reads are not guaranteed to hit all mutations unless a scrub is done; and Once ZFS does hit the mutated data, it (I'm guessing) might fault the drive again because it would appear to ZFS to be corrupting data, since it doesn't remember the previous write failures. Theoretically, ZFS could circumvent this problem by keeping track of mutations that occur during a degraded state, and writing them back to D when it's cleared. For some reason I suspect that's not what happens, though. I'm hoping someone with intimate knowledge of ZFS can shed some light on this aspect.

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