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• smartctl short test doesn't seem to complete

  - by Cédric COPY

  I am working on project which involve automated HDD testing through smartctl. The station is working fine on most product, but I have two specific products that fail the smartctl test. Those two product are both WD product (WD2500BUDT series) Smartctl behaviour is quite strange, in fact the test is launched without any problem, i wait about 2min (test length), and when i check the smartctl, i have got no result at all. It's like I hadn't launched any test (no fail, no success in smartctl result). No error return on command, nothing in syslog, .. As i said before, the test is working for other product, thousands products worked well with this test. The main smartctl command used are : smarctl -t shortest /dev/sdX #Launch test smartctl -l selftest /dev/sdX #Look at test result I have tried to use: smartctl -s on /dev/sdX or smartctl -o on /dev/sdX But doesn't change anything. The system is using Debian 6.0, smartctl v5.40 (rev 3124) x86_64, HDD are plug through SATA to PCI controller. I have 4 HDD connected at a time. Well if anyone has some hints to give with this problem, because I have no idea how can i fix this. Thanks in advance. PS: Not sure if it was a serverfault topic, sorry if i was wrong!

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• Show full URI/URL in Chrome's developer tools Network tab

  - by Lev

  When using Chrome to debug, I find it incredibly difficult to be efficient due to the fact that I don't see how I can force the "Network" tab of the developer tools to show the full request URI. It will show the full URI if you hover the link and wait a second, but this is incredibly counterproductive. All of my AJAX requests are sent to ajax.php, and handled by using query string arguments, like: ajax.php?do=profile-set ajax.php?do=game-save ... etc. Since I use AJAX extensively, my network tab is filled with "ajax.php", but I have to manually hover each and every entry to find the request I am looking for. Surely there has got to be another way!? I am constantly fed up by something new in Firefox and immediately force myself back into Chrome, but it is always the developer tools in Chrome that keep me from using it for an extended period of time. Hopefully I can find out how to do this so I can continue using Chrome as my numero uno. I've provided a screen shot to show you where I mean:

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• .tex file remains in use by process when batch file is triggered by .Rnw Sweave processing.

  - by drknexus

  This is a pretty specialized question. I'm using the Eclipse IDE in a Windows XP environment with the StatET plug-in so I can write R code as an R/Sweave document. This produces a .tex file that is then post processed by pdflatex.exe. When I create the file as normal everything works great (except maybe my file named russfnc2.Rnw seems to result in russfnc.pdf even though pdflatex.exe on the console window correctly says that the output is being writen to russfnc2.pdf). The big problem is when I trigger a batch file from within my Rnw code. My goal here is to spawn a side process that waits for the PDF to be made and uploads it to the server. So the Rnw contains: if(file.exists("rsp.finalize.bat")) {system("rsp.finalize.bat",wait=FALSE,invisible=FALSE)} The batch file calls Rterm.exe to run a script: setwd("C:/theprojectdirectory") while(!file.exists("russfnc.pdf")) { Sys.sleep(1) } Sys.sleep(60) At the end of that script, I use a shell call to launch psftp.exe and upload the files. All of this works fine, when I use my Eclipse profile to trigger Sweave... that is unless I have that batch file at the end of the .Rnw. When it is located there, I get the error message pdflatex.exe: Permission denied: c:\thepath\thetexfile.tex. After that, the .tex file (as far as XP is concerned) is in use by another process and I have to reboot in order to delete it (and, of course, the pdf is not made). If I manually trigger the batch file after pdflatex.exe has done its things, everything works fine. How can I make this work correctly using the tools I'm familiar with vis., R and Dos-style batch files? I'm not sure if this is a SuperUser question or a StackOverflow question, so I'm starting here.

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• Creating a pseudoterminal to make sudo happy

  - by larsks

  I need to automate the provisioning of a cloud instance (running Fedora 17) for which the following initial facts are true: I have ssh-key based access to a remote user (cloud) That user has password-free root access via sudo. Manual configuration is as simple as logging in and running sudo su - and having at it, but I would like to fully automate this process. The trick is that the system defaults to having the requiretty option enabled for sudo, which means that an attempt to do something like this: ssh remotehost sudo yum -y install puppet Will fail: sudo: sorry, you must have a tty to run sudo I am working around this right now by first pushing over a small Python script that will run a command on a pseudoterminal: import os import sys import errno import subprocess pid, master_fd = os.forkpty() if pid == 0: # child process: now that we're attached to a # pty, run the given command. os.execvp(sys.argv[1], sys.argv[1:]) else: while True: try: data = os.read(master_fd, 1024) except OSError, detail: if detail.errno == errno.EIO: break if not data: break sys.stdout.write(data) os.wait() Assuming that this is named pty, I can then run: ssh remotehost ./pty sudo yum -y install puppet This works fine, but I'm wondering if there are solutions already available that I haven't considered. I would normally think about expect, but it's not installed by default on this system. screen can do this in a pinch, but the best I came up with was: screen -dmS sudo somecommand ...which does work but eats the output. Are there any other tools available that will allocate a pseudoterminal for me that are going to be generally available?

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• Users removing Administrator from files/folders permissions

  - by user64204

  We're running Windows Server 2003 R2 with Active Directory and are having an issue with network shares whereby users, in an attempt to secure their documents, remove everybody (including the Administrator account) from their files/folders permissions. Since the Administrator no longer has read permission to them, we can't even backup files manually as we get permission errors. One solution that we've found is to change the owner of the files and directories to the Administrator account. We can then change the permissions as we wish. The problem is that this has to be done manually so can't really be applied to an entire share. Another solution that we've tried is to use cacls as follows: cacls d:\path\to\share /C /T /E /G Administrator:F The problem with this is that we're still getting an ACCESS DENIED error on files/folders on which Administrator was removed. Q1: Is there a way to restore at least read access to all files/folders to the Administrator account in a recursive fashion? That would be for the short term. For the long term we're looking for a solution to prevent users from removing Administrator from files/folders permissions. Since we're going to migrate to Windows Server 2008 R2 soon we could wait until we've migrated to implement such solution if need be. Q2: Is there a way to prevent users from removing Administrator from files/folders permissions on Windows Server 2003/2008?

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• picking a linux compatable motherboard

  - by Chris

  Last time I bought a new computer (I build them myself) I got a motherboard that had really poor linux support for a long time. Specifically the audio. I had to wait months before the kernel supported the on board audio chipset. That is exactly the situation I'm trying to avoid this time around. I have some specific questions about "server motherboards" actually. I looked at a few models of server motherboards by intel, and some random models on newegg. I wasn't able to see much of a difference from regular desktop motherboard other than most had two sockets, and support for much more ram. These boards seem more popular with Linux users. Why? AMD and Intel both have server CPUs as well. Some question, what's the difference? To make this question more concrete, I was looking at this this motherboard. The main questions about it that I can't answer are: Can I get a motherboard without on board raid and audio? I wanted to get a hardware raid controller and a PCI audio card. I thought a server motherboard would be cheaper and not have these "extras", since who wants an audio card on a server? Where can I found out about Linux support for the components on this board? "Intel ICH10R", "Realtek ALC889", "Marvell 88E8056" I'm buying this computer to work as a Linux desktop for a lot of compiling, coding and audio/video work, but I don't want to rule out the possibility of installing windows and playing some games at one point. (even if the last game I got has been sitting in its box unopened for almost a year). Is it a good idea to buy a "server motherboard" and play games on it, or are desktop boards better value for this? The ultimate solution for me would be a motherboard that had GPL divers for onboard LAN, a single CPU socket, lots of PCI express and PCI. USB 3.0, and no fancy hard disk controllers since I'll be getting a separate one.

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• Internet Troubles - PPPoE vs PPPoA?

  - by AkkA

  I have been having some internet troubles at home (ADSL2+ connection in Australia). We get random drop-outs from the authentication connection. It will keep the connection to the DSL service, but we lose authentication and either have to restart the router/modem (its combined, a Belkin one, not sure on model number) or unplug the phone cable, wait about 30 seconds and plug it in again. I've called the ISP (Telstra) a few times, but they only offer limited support when we dont use their supported hardware. Apparently something had happened on their side, they checked the box again (at least it sounded that simple), and told me it would be fine. It wasnt. I've replaced all the filters around the house, but that didnt help either. We do live a little bit away from the exchange (get a sync speed of about 3000/900), so I thought it could be due to line noise but that hasnt helped. Telstra allow both PPPoE and PPPoA connections (which I'm configuring through my router, dont have software on the PC side). I've been running PPPoA the whole time, would it make any difference changing it to PPPoE? If not, are there any other theories as to why we would be experiencing these drop-outs? It has been fine for at least 12 months, then suddenly started about 2 months ago.

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• Change Windows 7 Explorer's Details Pane limits

  - by Paul

  For some reason, MS decided to completely kill the status bar's functionality in Win7 (and maybe Vista, but I don't know for sure). I have tried all possible options such as Classic Shell and so on. Basically, the one thing I miss most is seeing at a glance the total size of my selected files. I know I can press Alt+Enter or whatever, but that's not the point. The point is that the so-called 'details' pane stops providing details if more than 15 files are selected! WTH? Cannot understand the reason behind such a stupid arbitrary limit, that doesn't seem to be user-configurable at all. Anyway, what I'm looking for is a way to change that limit, either via the registry or otherwise. If changing the limit isn't possible, would it be possible for some programming genius to create a very small optimized light-weight non resource-hungry (you get the idea!) program whose sole purpose will be to automatically click the "Show more details..." link in the details pane after every file selection? For bonus points, the program should wait for a second or two after file selection is complete to do this, so that selecting multiple files in quick succession doesn't hit the HDD repeatedly. Any takers for the challenge? :)

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• FreeBSD's ng_nat stopping pass the packets periodically

  - by Korjavin Ivan

  I have FreeBSD router: #uname 9.1-STABLE FreeBSD 9.1-STABLE #0: Fri Jan 18 16:20:47 YEKT 2013 It's a powerful computer with a lot of memory #top -S last pid: 45076; load averages: 1.54, 1.46, 1.29 up 0+21:13:28 19:23:46 84 processes: 2 running, 81 sleeping, 1 waiting CPU: 3.1% user, 0.0% nice, 32.1% system, 5.3% interrupt, 59.5% idle Mem: 390M Active, 1441M Inact, 785M Wired, 799M Buf, 5008M Free Swap: 8192M Total, 8192M Free PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND 11 root 4 155 ki31 0K 64K RUN 3 71.4H 254.83% idle 13 root 4 -16 - 0K 64K sleep 0 101:52 103.03% ng_queue 0 root 14 -92 0 0K 224K - 2 229:44 16.55% kernel 12 root 17 -84 - 0K 272K WAIT 0 213:32 15.67% intr 40228 root 1 22 0 51060K 25084K select 0 20:27 1.66% snmpd 15052 root 1 52 0 104M 22204K select 2 4:36 0.98% mpd5 19 root 1 16 - 0K 16K syncer 1 0:48 0.20% syncer Its tasks are: NAT via ng_nat and PPPoE server via mpd5. Traffic through - about 300Mbit/s, about 40kpps at peak. Pppoe sessions created - 350 max. ng_nat is configured by by the script: /usr/sbin/ngctl -f- <<-EOF mkpeer ipfw: nat %s out name ipfw:%s %s connect ipfw: %s: %s in msg %s: setaliasaddr 1.1.%s There are 20 such ng_nat nodes, with about 150 clients. Sometimes, the traffic via nat stops. When this happens vmstat reports a lot of FAIL counts vmstat -z | grep -i netgraph ITEM SIZE LIMIT USED FREE REQ FAIL SLEEP NetGraph items: 72, 10266, 1, 376,39178965, 0, 0 NetGraph data items: 72, 10266, 9, 10257,2327948820,2131611,4033 I was tried increase net.graph.maxdata=10240 net.graph.maxalloc=10240 but this doesn't work. It's a new problem (1-2 week). The configuration had been working well for about 5 months and no configuration changes were made leading up to the problems starting. In the last few weeks we have slightly increased traffic (from 270 to 300 mbits) and little more pppoe sessions (300-350). Help me please, how to find and solve my problem?

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• PHP Causing Segmentation Fault & Apache Blank Response

  - by Joe

  I recently updated a Debian Lenny server to php 5.3,5 using the dotdeb source. Soon after doing so certain (but not all) sites on the server stopped responding to requests. A blank response would be returned - no headers, no content, nothing. I found this related question on stackoverflow which seems to describe something similar and used the same code the user had in their answer to see if I could replicate the issue: <?php class A { public function __construct() { new B; } } class B { public function __construct() { new A; } } new A; print 'Loaded Class A'; ?> This triggered the problem - the page returned absolutely nothing despite the original question stating this was fixed in PHP 5.5.0. No CPU block as you'd expect, no wait, just an almost instant zero response. I then ran this same code from the cli (php -f test.php) and the only output I got was 'Segmentation fault'. Tailing the kernel log I've spotted: Feb 16 07:04:06 creature kernel: [192203.269037] php[17710] general protection ip:76ef37 sp:7fff155e9bb0 error:0 in php5[400000+870000] Feb 16 08:57:31 creature kernel: [199639.699854] apache2[31136]: segfault at 7fff13a84fe0 ip 7f730514ea40 sp 7fff13a85008 error 6 in libphp5.so[7f7304ce8000+915000] All extremely odd and I'm not sure what it's pointing to/what I should do to debug this further. As I said some sites work but code such as the above definitely trigger it. Not that the sites I want to server have code like that - it's just an example. Any help is much appreciated!

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• How to organize deployment process in Chef-controlled environment?

  - by Alex

  I have a web Linux-based infrastructure which consists of 15 virtual machines and over 50 various services. It is fully controlled by Chef. Most of the services are developed internally. Basically the current deployment process is triggered by a shell script. A build system (a mix of Python and shell scripts) packages the services as .deb files and puts these packages into a repo. It runs apt-get update on all 15 nodes then because the standard Chef apt cookbook only runs apt-get once per day and we definitely do not want to run apt-get update unconditionally on each chef-client wake. The build system restarts chef-client daemons on all 15 nodes finally (we need this step because of pull Chef nature). The current process has a number of drawbacks we want to address. First off, it is asynchronous because the deployment script does not check chef-client logs after restart so we don't even know if the deployment was successful. It does not even wait for Chef clients to complete the cycle. Second, we definitely do not want to force chef-client restarts on all nodes because we usually deploy only a small number of packages. And third, I am not quite sure using chef-client for deployment is legitimate, probably we are just doing it wrong from the start. Please share your thoughts/experience.

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• Linux - preventing an application from failing due to lack of disk space [migrated]

  - by Jernej

  Due to an unpredicted scenario I am currently in need of finding a solution to the fact that an application (which I do not wish to kill) is slowly hogging the entire disk space. To give more context I have an application in Python that uses multiprocessing.Pool to start 5 threads. Each thread writes some data to its own file. The program is running on Linux and I do not have root access to the machine. The program is CPU intensive and has been running for months. It still has a few days to write all the data. 40% of the data in the files is redundant and can be removed after a quick test. The system on which the program is running only has 30GB of remaining disk space and at the current rate of work it will surely be hogged before the program finishes. Given the above points I see the following solutions with respective problems Given that the process number i is writing to file_i, is it safe to move file_i to an external location? Will the OS simply create a new instance of file_i and write to it? I assume moving the file would remove it and the process would end up writing to a "dead" file? Is there a "command line" way to stop 4 of the 5 spawned workers and wait until one of them finishes and then resume their work? (I am sure one single worker thread would avoid hogging the disk) Suppose I use CTRL+Z to freeze the main process. Will this stop all the other processes spawned by multiprocessing.Pool? If yes, can I then safely edit the files as to remove the redundant lines? Given the three options that I see, would any of them work in this context? If not, is there a better way to handle this problem? I would really like to avoid the scenario in which the program crashes just few days before its finish.

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• Daisy-chainable DisplayPort Monitors

  - by thepurplepixel

  I am the proud new owner of a MacBook Pro with a mini-DisplayPort. My desk setup used to allow me to position the screen of my old MacBook beside an external monitor, essentially allowing dual-head. It was also advantageous that my old MBP and my external monitor had the same resolution, 1440x900. Now, I'm searching for a set of two monitors that I can use a HengeDock with. Unfortunately, the MacBook Pro suffers from having only one mini-DisplayPort. Looking up the spec for DisplayPort 1.2 (which the MBP supports), DisplayPort daisy chaining is supported. What I'm looking for is a monitor that has two DisplayPorts so I can daisy chain two monitors off the single mini-DisplayPort. What I don't want is a USB-based video solution. I need full acceleration on both monitors; an external video card won't cut it. I hope I don't have to wait a few years for these monitors to come out. TL;DR: I need two monitors with two DisplayPorts each that I can daisy-chain. Thanks!

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• Application (was Firefox) crash on first load on Ubuntu Linux on older Dell Laptop

  - by Ira Baxter

  I've had a Dell Latitude laptop since about 2000 without managing to destroy it. A month ago the Windows 2000 system on it did something stupid to its file system and Windows was completely lost. No point in reinstalling Windows 2000, so I installed an Ubuntu Linux on the laptop. Everything seems normal (installed, rebooted, I can log in, run GnuChess, poke about). ... but ... when I attempt to launch Firefox from the top bar menu icon, I get a bunch of disk activity, the whirling cursor icon goes round a bit and then (WAS: everything stops: icon, mouse. Literally nothing happens for 5 minutes. Ubuntu is dead, as far as I can tell. EDIT : on further investigation, spinning icon, mouse operated by touchpad freeze. There's apparantly a little disk activity occuring about every 5 seconds. I wait 5-10 minutes, behavior doesn't change) A reboot, and I can repeat this reliably. So on the face of it, everything works but Firefox. That seems really strange. The only odd thing about this system when Firefox is booting is that while it has an Ethernet port (that worked fine under Windows), it isn't actually plugged into an Ethernet. As this is the first Firefox boot since the Ubuntu install, maybe Firefox mishandles Internet access? Why would that crash Ubuntu? (I need to go try the obvious experiment of plugging it in). EDIT: I tried to run the Disk manager tool, not that I cared what it was, just a menu-available application. It started up like Firefox, I get a little tag in the lower left saying Disk P*** something had started, and then the same behavior as Firefox. At this point, I don't think its the Ethernet. Is it possible that the Ubuntu disk driver can't handle the disk controller in this older laptop? The install seemed to go fine.

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• EXCEL workbook, intermitently, takes 30 seconds to load

  - by Julio Nobre

  I am trying to figure out why a simple .XLS EXCEL workbook is taking, randomly, 30 seconds to open. Before answering: Please, bear mind the following: Problem symptoms Hanging is intermitent and it takes exactly 30 seconds; During hanging there is no cpu or disk activity; It only happens during workbook load. Every runs smooth after that; Windows Explorer.exe hangs on folder, but all other folders, system and applications are still responsive; There are no consecutive hangings. I have to wait for while to reproduce this behaviour; All workbooks where located on a local drive (C:\BPI); The workbook has no macros and no addins; Office 2003 is being used for several years; The computer is running Windows XP; Computer has several network mapped drives, all addressed to main file server; Recently, main fileserver was replaced by Windows 2011 SBS Standard Edition What I have done so far I have traced machine Explorer.exe, using Process Monitor, added Duration column, and filtered by Duration 1. That's is how I found that hanging was taking exactly 30 seconds. For further information, please refer to Oliver Salzburg tutorial. Using Process Monitor, I have also figured out than five operations were taking most of sample collecting duration. Looking at sample image below, column Operation below you will notice that one single operation was taking 29 seconds; I have tried different workbooks (all of them smaller than 30 KB); I have, temporarily, removed all shortcuts on User Document's folder that were pointing to network drives or shares; I have runned CCleaner to fix registry issues; I made sure that there were no external links on tested workbooks; I have reproduced this behaviour for hours; I have extensivelly researched for hours on the web; Process Monitor's collected and filtered data

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• GNU Screen and Finch Not Playing Nicely

  - by Sean M

  I use finch for instant messaging, and for persistence, finch is one of the things that runs in my screen session. There are three main computers that I access my screen session from, and each works at a different screen resolution. Because of the different resolutions, when I switch computers, I use screen -rd to attach to my screen session. Using screen -x results in problems. When I attach to the session, though, finch experiences display problems. I have to wait up to several minutes for finch to become responsive - it doesn't redraw properly at all. Trying to switch between chats just writes ^n and ^p, or ^(1-9) for numbers. It fixes itself after some time. Using ctrl-l does not help. Switching back and forth between screen windows does not help. This is an annoying behavior that I don't experience with any other applications running in screen. Is this a bug in screen or finch, and if not, what can I change about my configuration to correct it ? (would appreciate it if "finch" could be used as a tag for this instead of or in addition to "pidgin")

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• Optimal video resolution and encoding for recording games for YouTube?

  - by Rookie

  I want to record video from games, therefore I cannot use very large video resolution, but I still want to make the large video view to look as sharp as the original encoded video before upload. I tried to use YouTube's recommended 854x640 resolution, but it wasn't possible with h264 and the encoding software I used (Handbrake) converted it to a width of the nearest multiple of 4, which I think is a limitation of the h264 format. The video I encoded was sharp and fine quality, but when I uploaded it to YouTube, it lost a lot of quality and the preferred large video view looks almost as bad as a 320p video. I tried to wait a few days but it never got sharper (in case it didn't process it completely yet). So, which resolution and encoding options I should use, if I want the large video player to have the sharpest possible video, retaining the original video quality as good as possible? I noticed that recording with 640x480, the video was sharper than with 1280x720, so I'm not sure what im doing wrong here; both were h264. Is it anyhow possible to prevent YouTube from re-encoding the videos? I just wonder how people can make so sharp videos, while mine are all blurry after upload, but before upload they looked fine. I also tried YouTube's suggested bitrates with h264, but it didn't work any better.

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• Auto-rotate rotated images with mogrify

  - by Frank Presencia Fandos

  Some of my images have been taken rotated but kept this data. The problem is that, when using mogrify to convert them from JPG to png, that data seems to dissapear. For showing this problem, I think the best is to show the script and an screenshot. Script with the code. Put it in a text file, give it execution permission, double click, run (from terminal if you wish) and wait a while. All the JPGs in that folder will be converted to png. #! /bin/bash echo "Converting JPG to png. Please don't close this window." mogrify -alpha on -format png *.JPG mogrify -alpha on -format -alpha on png *.jpg It works great and adds an alpha channel. This is personally useful when I edit them later, not to add the channel individually. Now the screenshot that illustrates the problem: As you can see, the original ones' (JPGs) preview is right, the modified preview is wrong, the Shotwell rendering is right and the GIMP edit is wrong and didn't even say the image was rotated, as it uses to do with other images. How can I edit my script to preserve the orientation?

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• Server not accepting uploads

  - by Tatu Ulmanen

  I'm having a strange problem with my VPS: I can download files from it, I can use PuTTy to connect to it and all behaves normally. But sometimes, when I try to upload a file to the server or save a file via SFTP, the connection inexplicably fails. I am using jEdit to edit files remotely via SFTP. When it works, it works fine. When it doesn't, I get an error message: Cannot save: java.io.IOException: inputstream is closed Cannot save: java.io.IOException: 4: I can see that a temporary save file (#file.php#save#) is created on the server with a filesize of 0. So the connection works, but when it comes to sending the actual data, something fails. The same thing with WinSCP, but the error is different: Copying file fatally failed. Copying files to remote side failed. And I can always browse the server with PuTTy without a problem. I see nothing abnormal in any log files. Auth.log shows this when I try to save: sshd[32638]: Accepted password for - from - port 62272 ssh2 sshd[32638]: pam_unix(sshd:session): session opened for user - by (uid=0) sshd[32640]: subsystem request for sftp sshd[32638]: pam_unix(sshd:session): session closed for user - When I wait for a while (say, an hour), everything works fine again. It can't be a temporary ban, as I am still allowed to connect to the server, right? I know this may not be enough info to solve the problem, but I am grateful for any clues or bits of information that might help me. What are the possible causes for this kind of behaviour, what log files can I check for clues etc.. I'm running out of ideas!

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• EMC VNX iSCSI setup - unsure about SP/port assignment

  - by pauska

  We have a new VNX5300 waiting to get configured, and I need to plan out the network infrastructure before the EMC tech arrives. It has 4x1gbit iSCSI per SP (8 ports in total), and I'd like to get the most out of the performance until we jump over to 10gig iSCSI. From what I can read from the docs - the recommendation is to use only two ports per SP, with 1 active and 1 passive. Why is this? It seems kind of pointless to have quad-port i/o-modules and then recommend to not use more than two of them? Also - I'm a bit unsure about the zoning. The best practices guide state that you should separate each port on each SP from each other on different logical networks. Does this mean that I have to create 4 logical networks to be able to use all 8 ports? It also gives the following example: Does this mean that A0 and B0 should sit on the same physical switch aswell? Won't this make all traffic go on one switch (if both A1 and B1 are passive)? Edit: Another brainpuzzle I don't get it - each host (as in server) should not have more iSCSI bandwidth available than the storage processor. What on earth does this matter? If serverA have 1gbit and serverB have 100mbit, then the resulting bandwith between them is 100mbit. How can this result in some kind of oversubscription? Edit4: Wait, what. Active and passive ports? The VNX runs in a ALUA configuration with asymmetrical active/active.. there shouldn't be any passive ports, only preferred ones..

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• Need help trying to diagnose Symmetrix SAN performance issues

  - by arcain

  I am helping to benchmark hardware for a new SQL Server instance, and the volume presented to the OS for the data files is carved from a set of spindles on a Symmetrix SAN. The server has yet to have SQL Server installed, so the only activity on the box is our benchmarking. Now, our storage engineers say that this volume and it's resources are dedicated to our new server (I don't have access to see the actual SAN config) however the performance benchmarks are troubling. For example, the numbers look good until suddenly, and randomly, we see in our IO benchmarking tool wait times of 100 seconds, and disk queue lengths of 255 in perfmon. This SAN has an 8 GB cache, plus there are other applications besides ours that use the SAN. I'm wondering if (even though the spindles for our volumes should be dedicated to us) the cache may be getting hammered during the performance testing, or perhaps the spindles our volumes are on aren't really dedicated to us. We're not getting much traction from our storage engineers in helping us track down the problem, so if anybody has experience with diagnosing a problem like this and would like to share insights and troubleshooting methodologies, I'd appreciate it.

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• WebHost Manager - Apache's VHost isn't matching the DNS entry

  - by Trans

  I've used CPanel's WebHost Manager to create a new host on my VPS. I then used my HOSTS file to point fake.com to the relevant IP address. The problem I'm having now is, Apache isn't recognizing the VHost,or something, as it's just loading the default entry and 404'ing every document I try to GET. Here's the VHost entry NameVirtualHost 0.0.0.209:80 NameVirtualHost 0.0.0.211:80 <VirtualHost 0.0.0.209:80> ServerName fake.com ServerAlias www.fake.com DocumentRoot /home/fakecom/public_html ServerAdmin [email protected] ## User fakecom # Needed for Cpanel::ApacheConf <IfModule mod_suphp.c> suPHP_UserGroup fakecom fakecom </IfModule> <IfModule !mod_disable_suexec.c> SuexecUserGroup fakecom fakecom </IfModule> CustomLog /usr/local/apache/domlogs/fake.com-bytes_log "%{%s}t %I .\n%{%s}t %O ." CustomLog /usr/local/apache/domlogs/fake.com combined Options -ExecCGI -Includes RemoveHandler cgi-script .cgi .pl .plx .ppl .perl ScriptAlias /cgi-bin/ /home/fakecom/public_html/cgi-bin/ </VirtualHost> I've Google'd this profusely and all that's being returned is 'DNS errors. Wait for it to propagate'. That's obviously not my problem, since I'm using HOSTS. What else could be causing this? :/ EDIT: Forgot to mention. http://fake.com/~fakecom/test.html loads just fine. So the fake.com is pointing to the right IP.

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• Mailgun Is Not Detecting My New MX Records

  - by Tyler Crompton

  When I issue a DiG command to verify my MX records, I get the following output: $ dig example.com MX ; <<>> DiG 9.9.5-3-Ubuntu <<>> example.com MX ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 47700 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 5, ADDITIONAL: 5 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;example.com. IN MX ;; ANSWER SECTION: example.com. 85468 IN MX 10 mxa.mailgun.org. example.com. 85468 IN MX 10 mxb.mailgun.org. ;; REMAINDER OF OUTPUT REMOVED FOR BREVITY However, when I click "Check DNS Records Now" on Mailgun, it verifies the changes to the TXT and CNAME records but says that my MX records have not been changed. Type | Priority | Enter This Value | Current Value -----+----------+------------------+-------------------- MX | 10 | mxa.mailgun.org | 10 mail.example.com MX | 10 | mxb.mailgun.org | 10 mail.example.com I updated these records three to fours ago. I know it said to wait up to twenty-four to forty-eight hours. But I feel that if it detected the other DNS changes, then it should detect the MX record changes. Am I being impatient or is this a legitimate concern? What do you suggest I do? Note: I'd create a Mailgun tag for this; I feel that it'd be appropriate, but I don't have enough reputation to do so.

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• Connecting a laptop to a TV via HDMI

  - by Madmartigan

  I just bought a new Dell XPS17 laptop (Win7) that only has HDMI output. My last 2 laptops had VGA, which I used to connect to my Sony Bravia 32" TV with no issues, but with the HDMI it's been quite a headache. Drivers for display adapters have been updated to the latest versions: Intel(R) HD Graphics Family NVIDIA GeForce GT 550M I went to a store and plugged in to 4 different TVs from different manufacturers. A sales rep and I spent about 30 minutes being baffled by the results (which are the same as my current TV): Extreme buggy behavior in the Nvidia and Windows display/resolution control panel Can not extend or duplicate displays, can only select one Third and fourth output devices "randomly" detected by the Windows control panel Could not get the screen to fit the output (edges cut off on all sides by about a half inch) Resolution and colors less than perfect. Artifacts around text. Display "randomly" cuts out Defaults to TV output only when plugged in Can not change resolution on either device when connected No audio from the TV Plugged in to 3 monitors from different manufacturers: Defaults to duplicated displays when plugged in Everything works perfectly So far, four people have gone through all the settings in the latop with no luck. I had similar, but not exactly matching results with a different laptop. I'm using the Sony Bravia currently at home, but in order to get it to work I have to turn on the laptop, wait until the display shows up on it, close the lid, then cycle through each output channel on the TV until I come back around to the HDMI port again, but still I have the symptoms described above. However: Once in a while, it just works. Sometimes, seemingly randomly, the output fits the screen perfectly. Sometimes the audio comes through the speakers too, but not always. Usually my screen saver "Mystify" will come up with a message that it cannot be displayed due to a limitation of the video card, but then sometimes it works fine. These 3 things seem to be independent of each other and don't always happen together. So, is there any way to get the laptop to output correctly to a TV, or is it just not meant to be?

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• windows 95 virtualization and CPU idle

  - by brtlvrs

  We are in the situation that we need to migrate our windows 95 systems (i know, that is so last century ). There is no hardware for a reasonable price available to run our windows 95 systems. So we are extending the overdue lifetime of it, by making them virtual. Now we see that VMware reports 100% CPU utilization of a windows 95 VM. This is because windows 95 doesn't know how to manage a CPU. For this reason software like rain or Waterfall, or CPUCool are introduced. The they are sending a HLT instruction to the CPU. This causes the CPU to halt and wait for new triggers to work. I've tested the mentioned programs in the VM, but they don't work, but generate errors. anyone has a valid workaround, solution ?? btw. I know that the best solutiuon is to replace the windows95 with windows XP. But in our situation that will take at least 5 years. Our windows 95 systems are running factory process control software.....

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