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• Problems using InfraRecorder to back up ISOs of certain CDs

  - by Voyagerfan5761

  I've gotten into the habit of backing up my CDs as ISO files, just in case the discs should be damanged, lost, or destroyed. Using InfraRecorder, the process is pretty painless. Unfortunately, I have run into at least two discs that don't back up. I get the error message: Can't read source disc. Retrying from sector 252270 Sometimes this will appear repeatedly. One of the discs is my retail copy of Star Trek: Armada II; the other is disc one of DOOM 3. Both discs run flawlessly when I put them in the drive and let Windows AutoPlay them. Armada II appears as two tracks (one data, one audio) in InfraRecorder, and the error happens at the approximate track boundary. DOOM 3's first disc, however, fails much sooner (around sector 990) and appears as one solid data track. Am I simply using the wrong tools for this job? InfraRecorder is a nice free tool that I can run from my flash drive and use for most tasks of this type, but it does seem to have trouble with certain things. Ideally I'd like to hear about any workarounds people have found for this issue, but if I must switch tools I'm open to it (preferably other free tools).

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• What is the sysadmin's dream network printer? 6-8k pg/mo. Xerox, OkiData, Lexmark and HP are all fail

  - by Jacob

  How do I find out what printer brand and/or type doesn't suck? This information is hard to find and manufacturer's websites won't reveal any issues with certain printers. After 10 years of dealing with network shared printers, I can't say that I have been impressed with any of the printer brands I've seen. Brother's little laser MFPs have been close to ideal for low volume, but that is it, period. OkiData, Lexmark, HP, Xerox solid ink printers, they all sucked in one way or another. Currently I'm looking to replace a Xerox ColorQube 8570 because it fails to print on a regular basis. Sometimes it doesn't even boot VxWorks fully - it just hangs at 2% or whatever. I've used Xerox 8860MFPs and they sucked just as bad. I won't talk about ink jets here, that's most likely not what I'm looking for. We currently spend about $4k on paper and ink per year for this printer at up to 6-8k pages per month, letter, mostly black and white, low color usage. I want the printer to feed paper correctly, not crash and burn when a PDF isn't according to its taste (my favorite Xerox problem here) and with decent drivers for Windows and OS X. Print quality is not of the utmost importance but paper does get sent to customers.

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• A lots of Apache processes are using my CPU uses always more than 70%

  - by Barkat Ullah

  I am running a plesk panel in 1and1. I have 120 sites running and all are using pligg cms, each site has 600 visitors per day. Please see the details of my server below: HDD-1000GB RAM-16GB Processor-6 Core I always see a lot of apache processes running in my # top view, so the server seems overloaded. If I can reduce the amount apache processes I think the server will be ok. But I don't know why too many apache processes are running. Please see the link below for the screenshot of my # top view: http://dl.dropbox.com/u/26967109/%23Top-2.jpg Sometimes I saw too many connection error in my plesk control panel, so I added the below line in my [mysqld] section: set-variable=max_connections=416 But I didn't find a solution yet. I have also added maxclients and serverlimit 416 in the config /etc/httpd/conf/httpd.conf But no solution yet. I am researching around more than 7 days but don't get any solution. Please help me to solve the problem. In peak hours my sites are taking too much time to load, but off-peak hour it is ok. Please help me to find out the actual problem.

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• Weird PCI bug: lots of missed packets, or data comes in "bursts"

  - by Thomas O

  I have an ABIT KN9 motherboard. It has one PCI-e x16 slot, three PCI-e x4 slots and two legacy PCI. My problem is with the legacy PCI (which I shall just call "PCI".) I currently have an Nvidia GeForce 8600 GT (a low end card) installed in the x16 slot and a TV card in PCI #1; the x4 slots are unused, as is PCI #2. I plan to upgrade the graphics card soon, the current card was spare. I sometimes install a USB expander in PCI #2 but it causes a lot of problems - see below. The problem is under Linux (Ubuntu 10.10, Linux 2.6.35-22-generic), but probably under all operating systems (I have not yet been able to test Windows, but I suspect it will do the same as the problems occur on the BIOS/POST side too, e.g. when using a USB keyboard on the expander the keyboard will not work at all) PCI has an enourmous delay, and packets arrive in large chunks. For example, when using the USB expander, my USB mouse lags and jumps in large steps every second or so, while using the motherboard USB does not present this problem. My TV card will only do one or two frames per second, and the program (xawtv) usually times out and crashes. In dmesg, I'm getting messages like: bttv0: timeout: drop=74, irq=154/100476, risc=31f6256c, bits: VSYNC HSYNC OFLOW RISCI for my TV card, and similar timeout issues for my USB expander with a mouse. I received the motherboard, processor and RAM second hand and have only just got around to building it, so I don't know if this problem has always existed, or if it's a result of my set up. If anyone has any hints or solutions it would be appreciated - this is kind of a show-stopper for me.

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• Dell PS/2 Keyboard Stops Working Randomly After Power Disturbance

  - by Kenneth Murphy

  I have a Dell PS/2 keyboard connected to a desktop PC running Slackware 12.2 & Windows XP. After a recent, brief power outage/disturbance at my home, the keyboard has begun to quit working at random times. It has stopped at POST, but not by keyboard error -- I have to press the F1 key to continue booting, and at times the keyboard has already stopped working. Other times, the keyboard will work perfectly for a long time (a day or more) before it finally quits. It has stopped at boot, in Windows XP, and in Slackware. The led lights continue to work regardless. I have tried another PS/2 keyboard and it seems to be immune to this problem. The USB mouse always works. Does anyone have any ideas about how this might have happened? If this is related to the power disturbance that killed the power to the running PC, is it feasible that it would have only fried the keyboard itself (which still works sometimes) and not the PS/2 port nor anything else? I have experienced no other problems since the event.

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• How/when do you study?

  - by Sergei

  Would be interesting to find out how other sysadmins are educating themselves. I find myself in the need of constantly learning new things. I prefer to spend more time on the subject and know it thoroughly knowing that not doing so will kick me back in the future. This can be frustrating sometimes as it feels that I move too slowly. Our company has account on safari.oreilly.com and I am reading a book or two at any given time. I also read sysadmin related blogs for ideas and tips and to keep myself in the tune with the trends. I cannot do any study at home as I would rather spend my out of work hours with my family plus I find it hard/impossible to study at home due to the inability to concentrate at home. So I mostly study while on the train, luckily my commute time takes up to 2 hours a day. I also read a lot at work and don't feel guilty about it. To fix/implement/plan, I need to have a solid knowledge and if it requires time then this is a part of my job being a sysadmin. There is a joke that says "sysadmin is a person that knows a lot about everytihng and as a result knows nothing" - I think ther is a grain of truth here...

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• IP queue buffer

  - by summerbulb

  I seem to have an issue with IP queue. I have a linux machine that I am using to run some experiments. The linux machine is configured to be a router, having two NICs, connecting two other computers, and managing their network traffic. All incoming packages are captured, using iptables, and analyzed by a C application. The application analyzing the packets has a built-in delay, as part of the experiment. So I have one very fast computer sending packets through my linux-router and a (relatively) slow linux-router that analyses and deals with the packets, one by one. This situation leads to the fact that when I fire up a sender application on one of the computers connected to the linux-router, my IP queue on the linux-router gets filled up (almost) instantaneously. The IP queue's max length is currently set to 1024, and if it overflows, the packets are dropped. This is expected and i'm OK with it. But, (and this is where it gets interesting), every now and then I get the following error: "Failed to receive netlink message: No buffer space available" At start, I thought this was due to the IP queue overflow, but after some analysis i found that sometimes I get the error even if the IP queue buffer did not overflow, and sometime I DON'T get the message even though the buffer DID overflow. When I run > cat /proc/net/ip_queue, I get the following table (also used to monitor the IP queue overflow): Peer PID : 27389 Copy mode : 2 Copy range : 65535 Queue length : 0 Queue max. length : 1024 Queue dropped : 1166875 Netlink dropped : 2916 Looking at the last two values, Queue dropped seems to refer to packets that did not manage to get into the IP queue because the buffer was full. I can see this value rise as I bombard the linux-router. Netlink dropped ( as it's name implies :) ) seems to have to do with the error i'm getting. I did my best to search for material on this error, but wasn't able to find anything that seemed to point me in the required direction. Bottom line: Why am I getting this error and what can I do to avoid it?

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• Cut (smart edit) .mts (AVCHD Progressive) files un Ubuntu Lucid

  - by pts

  I have a bunch of .mts files containing AVCHD Progressive video recorded by a Panasonic camera, and I need software on Ubuntu Lucid with which I can remove the boring parts, and concatenate the interesting parts, all this without reencoding the video stream. It's OK for me to cut at keyframe boundary. If Avidemux was able to open the files, it would take about 60 hours of work for me to cut the files. (At least that was it last time I tried with similar videos, but of a file format supported by Avidemux.) So I need a fast, powerful and stable video editor, because I don't want that 60 hours of work go up to 240 or even 480 hours just because the tool is too slow or unstable or has a terrible UI. I've tried Avidemux 2.5.5 and 2.5.6, but they crash trying to open such a file, even if I convert the file to .avi first using mencoder -oac copy -ovc copy. mplayer can play the files. I've tried Avidemux 2.6.0, which can open the file, but it cannot jump to the previous or next keyframe etc. (if I make it jump to the next keyframe, and then to the previous keyframe, it doesn't end up at the original keyframe, sometimes displays an error etc.). Also I'm not sure if Avidemux 2.6.x would let me save the result without reencoding. I've tried Kdenlive 0.7.7.1, but playback is very choppy, and it cannot play audio at all (complaining that SDL cannot find the device; but many other programs on the system can play audio). It would be a pain to work with. I've tried converting the .mts file to .mkv using ffmpeg -i input.mts -vcodec copy -sameq -acodec copy -f matroska output.mkv, but that caused too much visible distortions in the video in both mplayer and Avidemux. I've tried converting the .mts file with TsRemux.exe, but Avidemux 2.5.x still can't open that file. Is there another program to cut and concatenate the files? Is there a preprocessor which would create a file (without reencoding the video) on which Avidemux wouldn't crash?

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• CLOSE_WAIT sockets burst - perhaps because of iptables settings?

  - by Fabrizio Giudici

  I have an Ubuntu 12.04 server virtual box where basically the installed software and configuration are the default ones, plus the installation of a jetty 6 server which servers a few websites. To keep things simple I didn't install apache httpd and used iptables for exposing jetty (which runs on the 8080 port) to the port 80. These are the results of /sbin/iptables -t nat -L Chain PREROUTING (policy ACCEPT) target prot opt source destination REDIRECT tcp -- anywhere localhost tcp dpt:http redir ports 8080 REDIRECT tcp -- anywhere Ubuntu-1104-natty-64-minimal tcp dpt:http redir ports 8080 Chain INPUT (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination REDIRECT tcp -- anywhere localhost tcp dpt:http redir ports 8080 REDIRECT tcp -- anywhere Ubuntu-1104-natty-64-minimal tcp dpt:http redir ports 8080 Chain POSTROUTING (policy ACCEPT) target prot opt source destination I must confess I have a shallow comprehension of how iptables works, in particular for the different kind of chains. This thing works, but sometimes I have an explosion of sockets that stay permanently in CLOSE_WAIT state. I know about what this state means, but since I didn't write the code that manages servlets (they are handled by jetty) I can't fix the problem by patching my code. Eventually the amount of CLOSE_WAIT sockets builds up and makes the server not responsive, so I have to restart jetty. I've looked around for similar problems wth CLOSE_WAIT, and only found cases related to the programmer's code, or problems with Tomcat, not Jetty. I was wondering whether they could be related to a partially broken iptables configuration (the alternative is a bug in Jetty 6, but I first want to exclude other possible causes). Thanks.

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• What program sent which packet to the network [closed]

  - by Erik Johansson

  I would like to have a tcpdump like program that shows which program sent a specific packet, instead of just getting the port number. This is a generic problem I've had on and off sometimes when you have and old tcpdump file lying around you have no way to find what program was sending that data.. The solution in how i can identify which process is making UDP traffic on linux ? is an indication that I can solve this with auditd, dTrace, OProfile or SystemTap, but doesn't show how to do it. I.e. it doesn't show the source port of the program calling bind().. The problem I had was strange UDP packets, and since those ports are so short lived it took me a while to solve this issue. I solved this by running an ugly hack similar to: while true; date +%s.%N;netstat -panut;done So either a method better than this hack, a replacement for tcpdump, or some way to get this info from the kernel so I can patch tcpdump. EDIT: This was asked on superuser "tracking what programs sends to net", no good solution though.

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• How can i export a folder of Firefox Bookmarks into a text file

  - by Memor-X

  I want to clean up my bookmark folders by getting rid of duplicated/links. i have created a program which will import 2 text files which contains a URL like this File 1: http://www.google/com http://anime.stackexchange.com/ https://www.fanfiction.net/guidelines/ https://www.fanfiction.net/anime/Magical-Girl-Lyrical-Nanoha/?&srt=1&g1=2&lan=1&r=103&s=2 File 2: http://scifi.stackexchange.com/ http://scifi.stackexchange.com/questions/56142/why-didnt-dumbledore-just-hunt-voldemort-down http://anime.stackexchange.com/ http://scifi.stackexchange.com/questions/5650/how-can-the-doctor-be-poisoned the program compares the 2 lists and creates a single master list with duplicate URLs removed. Now i have a few Backup bookmark folders in Firefox which on occasion i'll bookmark all tabs into a new folder with the date of the backup before i close off tabs or do reset my PC. each folder can have between 1000-2000 bookmarks, sometimes there are a bunch of pages which keep getting bookmarked, ie, i have ~50 pages on the Magical Girl Lyrical Nanoha Wiki on different spells, character and terminology which i commonly look back on. I'd like to know how i can export a bookmark folder so i have a list of URLs similar to what i use in my program

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• How to create domain or router-level workgroup (dd-wrt micro)

  - by Anthony

  In Windows, is active directory required for using "Domain" instead of "workgroup"? Do I need to register a domain with a DNS provider like godaddy? What I really want to do is set up my home LAN so that everyone connecting to the main router (which is everyone, which is about 30 people) can see each other. I've tried having everyone use the same work group name, still hit or miss. I tried setting the domain name and host name on the router itself, still nothing. I've tried joining the domain name I set instead of work group, and I get an AD error. But ideally, everyone who is connected to the main router should simply just see each other and any shared folders. I've had this problem when I was not the network admin on other large LANs, and I've never been able to figure out why sometimes people disappear or never see each other. I'd really prefer using the native sharing functionality in the OS to setting up an internal FTP or Samba server, etc. Any sure-fire ways to fix this? (maybe an open source clone of AD?) Thanks!

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• Boot sequence unlike reboot

  - by samgoody

  When I turn on the computer it acts very differently than when I reboot it. [WinXP Pro, Intel Core2 6600, 2.4GHZ, 2GB RAM, NVIDA GeForce] Boot: Monitor must be plugged into the motherboard or no image. Screen resolution 800x600. Changes to the resolution cause only the top half of the screen to be usable, and are lost when I shut down the computer. Desktop icons arranged in neat rows on left of desktop. Nothing of note in system tray In Device Manger - Display adapter: Intel(R) Q965/Q963 Express Chipset Family In Device Manger - Monitors, two monitors are listed Hibernate and standby work. Reboot: Monitor must be plugged into the graphics card or no image. Screen resolution - 1280x1024 Desktop icons arranged in the cute circle that I put them in. NVIDIA icon shows in system tray. In Device Manger - Display adapter: NVIDA GeForce 6200LE In Device Manger - Monitors, one monitor is listed Hibernate and standby do not work. When awakened after a hibernation it says: The system could not be restarted from its previous location because the restoration image is corrupt. Delete restoration data & proceed to system boot? Double reboot (inconsistent): Monitor must be plugged into the graphics card. Screen resolution - 1024x768 Odd icon shows in system tray whose tooltip says "Intel Graphics" For a while my morning ritual was to boot, wait, reboot using (alt+ctrl+del - ctrl+u - R), wait. Keeping the monitor plugged into the graphics card. But aside for the inefficiency of this method, I sometimes want to standby and can't. On the other hand, the computer is unusable when set to 800x600. Please help, anyone?

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• Dedicated virtual setup is slow with WordPress

  - by kovshenin

  Hey. I'm running a Fedora linux server on the Amazon EC2 platform. I'm pretty sure there's something wrong with my configuration as it seems to be very slow. SSH sometimes takes over 30 seconds to connect, a WordPress generated web page could take 5 seconds to load, and it could take 20 seconds to load, which is pretty awkward. MySQL queries are all executed in less than a second, so I don't think that's the case. I'm not really sure where the issue lies, but a simple page written in PHP loads instantly. A fresh WordPress installation starts lagging. Same works perfect on grid hosting at MediaTemple for instance, so I'm pretty sure I missed something. If you could please direct me to the right tools and articles which would help me out. Thanks so much! Fedora Core 8, php 5.2.6, MySQL 5.0.45, OpenSSH 4.7p1, OpenSSL 0.9.8b. PHP is configured as a module to Apache 2.2.9, all websites based on virtual hosts. I have some on-going php scripts running from time to time in the background via cron. Thanks.

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• Dual pane file manager for Mac OS X

  - by Alex Kaushovik

  Is there a good customizable dual-pane file manager for Mac like Total Commander / Far Manager in Windows, or like Krusader / Midnight Commander in Linux? I used to work on Windows for quite a while and mostly used Far Manager and sometimes Total Commander, then I switched to Ubuntu Linux and used Krusader, now I switched to Mac OS (Snow Leopard) and I'm having a hard time trying to find a good file manager... Many of the existing applications are trying to replace the Finder with "multimedia capabilities nobody cares about in file manager - IMHO" (Path Finder, ForkLift), some of them are almost good dual-pane file managers (couldn't remember examples), but none of them worked for me mostly because of one reason: I couldn't integrate my file/folder comparison utility (Araxis Merge for Mac) with them... The way it worked for me in Windows and Linux is that I was setting the cursor on one file in the left pane, then setting the right-pane cursor on another file in right pane, then I pressed a hotkey that launched Araxis Merge with those to files/folders comparison results. It was very easy to set up in Far Manager (Windows) and Krusader (Linux, actually in Linux I used "Meld" instead of Araxis Merge...) The tool I'm looking for doesn't necessarily has to be free... Thank you!

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• Any program to help me check whether an ethernet channel can support full-length VLAN packet?

  - by Jimm Chen

  Sometimes, I have to face such a situation that I need to quickly and explicitly know whether a full length VLAN packet can traverse between two RJ45 ports. Yes, I mean 802.1Q ethernet frame with Etype=81 00 (diagram below). What I can do now is: Get two Windows PCs, for each PC, intall Intel Gigabit NIC and Intel specific driver to create a virtual NIC, with VLAN ID=3 assigned. Then connect the two PCs to each of the two RJ45 port. Finally execute ping to generate a full-length ethernet packet. ping -f -l 1472 <dest-IP> This way, I can be sure that the sent packet has the maximum "IP data payload" of 1500 bytes(8 bytes of ICMP header and 1472 bytes of ICMP data). If the ping gets reply, I know that the ethernet channel support full-length VLAN packet. From my experiment, some home switch or broad band routers(e.g. Linksys WRT54G) does not support full-length VLAN packet switching, so only ping -f -l 1468 succeeds. You see, I have to use an expensive Intel NIC to carry on that test, quite inconvenient. You know, for most laptop today, they do not equip an Intel NIC, and, even it is an Intel NIC, Intel VLAN driver, Intel has limitations on the models on which VLAN driver can be installed. So, my question is: Is there a small program that can let me send a full-length VLAN packet without installing a dedicated VLAN driver? Or better, the program has a stock feature that does the very job for my situation. Windows programs preferred, Linux solution welcome. Simpler the program, the better. Thank you.

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• Vista Screen resolution Changes when Switching Users

  - by Benjol

  I regularly have a problem when switching between users in Vista - the screen resolution drops down to 800x600. If I try to set the resolution back to the maximum, it says nothing, but just keeps it at 800x600. I can set it back to an intermediate value. Otherwise I have to either restart the PC, or sometimes if I log off one of the users, I can then set the resolution back to max. Might it also have something to do with using sleep mode instead of performing regular shutdowns? I thought it might be related to the desktop background image taking up too much space, but even with plain colours, the problem still occurs. There is an enormous thread on this here, but not really any answers. From what I can gather from that thread, it isn't related to any particular applications, nor limited to a particular make of graphics card or monitor, so I don't think that including hardware details is useful. This is a very annoying problem, as it screws up my desktop and screen layout every single time. Has anyone here experienced this problem or found a solution? I've noticed that Windows Update has tried to install nVidia updates and apparently they've failed on several occasions. Not sure if that is of any relevance or not. UPDATE The last post on the thread: FWIW - I had this problem for about 2 years and wrote a number of posts in this thread in the past. It survived OS reinstallation, change of practically all of my hardware piece by piece (mobo, cpu, monitor, graphics card, memory, power supply...) I used to be affected by this annoying problem at least once every 24-48 hours. About 1.5 months ago I wiped out my 32 bit vista ultimate installation and installed Windows7 ultimate 64 bit from scratch and never saw this problem again. GOOD RIDDANCE. Vista was a pathetic piece of __ that felt like a flashback to the old [horrible] NT4/Windows95 days. I was seriously considering switching over to Apple/Mac OSX if this problem persisted.

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• How do I clear out the ssh-agent entries (on Mac OS X )?

  - by cwd

  I'm running Mac OS X, and it appears that after SSHing to several machines, using identity files, my 'ssh-agent' builds up a lot of identity / keys and then sometimes offers too many to a remote machine, causing them to kick me off before connecting: Received disconnect from 10.12.10.16: 2: Too many authentication failures for cwd It's pretty obvious what's happening, and this page talks about it in more detail: SSH servers only allow you to attempt to authenticate a certain number of times. Each failed password attempt, each failed pubkey/identity that is offered, etc, take up one of these attempts. If you have a lot of SSH keys in your agent, you may find that an SSH server may kick you out before allowing you to attempt password authentication at all. If this is the case, there are a few different workarounds. Rebooting clears the agent and then everything works OK again. I can also add this line to my .ssh/config file to force it to use password authentication: PreferredAuthentications keyboard-interactive,password Anyhow, I saw the note on the page I referenced talking about deleting keys from the agent, but I'm not sure if that applies on a Mac since they appear to be cleared after reboot anyhow. Is there a simple way to clear out all keys in the 'ssh-agent' (the same thing that happens at reboot)?

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• Setting up squid proxy server to in turn connect using another proxy server [closed]

  - by AnkurVj

  My institute uses the Squid proxy server and authentication mechanism requires username and password to be entered. This means that, I can log in on only one machine at a time and Internet access for me is restricted to that machine. I sometimes require Internet access on multiple machines simultaneously. What previosuly worked for me was the following : On one of my own machines A, I set up a Squid proxy server that allowed all local machines without any username and password. I configured rest of the machines to use this machine A as the proxy server. On machine A I logged into the institute proxy server using my browser. This way, I could access Internet from all my machines, by effectively channeling my requests through the server A. Recently, I lost that machine and configuration and now I tried to set it up again in the same manner. However, I cant seem to remember exactly how I made it work. I keep getting Connection Refused (111) on other machines. My guess is that my squid server isnt able to forward requests from other machines to the actual squid server. I could use any help for debugging this problem. I don't want to use alternatives such as ssh tunneling. This solution has worked for me in the past, I just don't remember how to set it up the same way again.

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• SSH session becomes unresponsive when logged into Ubuntu Server virtual machine using VirtualBox

  - by nickbart

  Hi everyone, I'm really at my wits end here, so I'm hoping someone here can help me. I have a virtual machine running Ubuntu Server 9.10. It's just a small development environment so I can keep my code separate from the test and production environments. I am running it through VirtualBox 3.1.6 on a laptop running Ubuntu Desktop 9.10. I have it set up with a bridged network connection and it is bridged to my laptop's wireless adapter. We have no wired connections in this office. I boot up the VM and everything is fine. I can SSH into it using gnome-terminal and for a while everything is Kosher. Then seemingly randomly, the SSH terminal session with hang. No error message, nothing; it just becomes unresponsive. If I go to the VirtualBox terminal I find the VM itself is perfectly fine. It can ping and I can SSH out with it. If I restart the networking on the VM the SSH session in my gnome-terminal will most of the time become responsive again. Here's an interesting point, the SSH session will sometimes die right in the middle of me typing something (this points to it not being an idle session issue) and if I go to the VirtualBox terminal and restart the networking and then return to my gnome-terminal SSH session I find that it will come back to life and what I typed when the session hung originally will magically type itself in to the buffer. So, my input is getting stored somewhere and just can't make its way to the VM until the networking on the VM is restarted. I've tried different versions of VirtualBox and used vmdk images and vdi images and nothing seems to work. I can't tell if the problem is with my laptop, VirtualBox, or the Ubuntu Server VDI. Is there anyway to debug this issue? Or has anyone out there seen anything similar? Your help is much appreciated. Nick

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• Is there a good alternative to Videora iPod Converter?

  - by Richard

  I use Videora to convert my videos (in DivX/XviD format) to something I can play on my iPod Classic. I really dislike it. It's clunky, riddled with adverts, sometimes doesn't convert properly (the infamous "invalid public atom" error - see Google for more) and has a UI that truly stinks. On the upside, it's free, accepts a list of video files (via the oddly hard to find "1-click convert" button) and just gets on with the converting as it already knows the correct settings for my iPod. One final nice touch is that once they are converted, it'll automatically upload them into iTunes. Are there any alternatives which have all the upsides but none of the downsides? Bonus points if they can set the metadata in iTunes correctly for TV shows (season, show, episode) and delete the converted file afterwards (as my iTunes settings means that a copy is made elsewhere). I've looked at a bunch of applications (handbrake, virtualdub, mediacoder, format factory, any video converter, convertxtodvd) but many of them fail the "just select a list of files and get on with converting" test - let alone all the other features I want. I have no desire to individually set the video size of each file or the codec or the post-processing options. I'm currently using the command line version of HandBrake (handbrakecli) and a hand-written DOS batch file to go through every file in a folder and convert it. It does most of what I want, just not in a very slick way. Can anyone recommend anything better? It needs to work on Windows 7 and be free.

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• Is this hard disk dead?

  - by Korjavin Ivan

  Not sure, is this right site for this Q, but let me try Last time i have problem with hard disk. Sometimes its do strange sound, and i get it from logs: $dmesg | grep ata4 [29409.945516] ata4.00: exception Emask 0x10 SAct 0xf SErr 0x90202 action 0xe frozen [29409.945529] ata4.00: irq_stat 0x00400000, PHY RDY changed [29409.945538] ata4: SError: { RecovComm Persist PHYRdyChg 10B8B } [29409.945546] ata4.00: failed command: READ FPDMA QUEUED [29409.945562] ata4.00: cmd 60/30:00:56:22:5f/00:00:00:00:00/40 tag 0 ncq 24576 in [29409.945573] ata4.00: status: { DRDY } [29409.945580] ata4.00: failed command: READ FPDMA QUEUED [29409.945594] ata4.00: cmd 60/18:08:8e:22:5f/00:00:00:00:00/40 tag 1 ncq 12288 in [29409.945605] ata4.00: status: { DRDY } [29409.945611] ata4.00: failed command: READ FPDMA QUEUED [29409.945625] ata4.00: cmd 60/08:10:46:02:66/00:00:00:00:00/40 tag 2 ncq 4096 in [29409.945635] ata4.00: status: { DRDY } [29409.945641] ata4.00: failed command: READ FPDMA QUEUED [29409.945656] ata4.00: cmd 60/80:18:ee:04:66/00:00:00:00:00/40 tag 3 ncq 65536 in [29409.945666] ata4.00: status: { DRDY } [29409.945679] ata4: hard resetting link [29413.976083] ata4: softreset failed (device not ready) [29413.976097] ata4: applying SB600 PMP SRST workaround and retrying [29414.148070] ata4: SATA link up 3.0 Gbps (SStatus 123 SControl 300) [29414.184986] ata4.00: SB600 AHCI: limiting to 255 sectors per cmd [29414.243280] ata4.00: SB600 AHCI: limiting to 255 sectors per cmd [29414.243292] ata4.00: configured for UDMA/133 [29414.243324] ata4: EH complete [680674.804563] ata4: exception Emask 0x50 SAct 0x0 SErr 0x90a02 action 0xe frozen [680674.804575] ata4: irq_stat 0x00400000, PHY RDY changed [680674.804584] ata4: SError: { RecovComm Persist HostInt PHYRdyChg 10B8B } [680674.804603] ata4: hard resetting link [680678.840561] ata4: softreset failed (device not ready) Is this ata4 sata hard drive dead? Must i change it ASAP ? Need I specify more info?

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• What's the piece of hardware listening on Facebook's or Wikipedia's IP address?

  - by Igor Ostrovsky

  I am trying to understand how massive sites like Facebook or Wikipedia work, for my intellectual curiosity. I read about various techniques for building scalable sites, but I am still puzzled about one particular detail. The part that confuses me is that ultimately, the DNS will map the entire domain to a single IP address, or a handful of IP addresses in the case of round-robin DNS. For example, wikipedia.org has only one type-A DNS record. So, people from all over the world visiting Wikipedia have to send a request to the one IP address specified in DNS. What is the piece of hardware that listens on the IP address for a massive site, and how can it possibly handle all the load coming from the requests for users all over the world? Edit 1: Thanks for all the responses! Anycast seems like a feasible answer... Does anyone know of a way to check whether a particular IP address is anycast-routed, so that I could verify that this really is the trick used in practice by large sites? Edit 2: After more reading on the topic, it appears that anycast is not typically used for dynamic web content. Anycast is usually used for UDP (e.g., DNS lookups), or sometimes for static content. One interesting thing to note is that Facebook uses profile.ak.fbcdn.net to host static content like style sheets and javascript libraries. Each time I ping this name, I get a response from a different IP address. However, I can't tell whether this is anycast in action, or a completely different technique. Back to my original question: as far as I can tell, even a large site will have a single expensive piece of load-balancing hardware listening on its handful of public IP addresses.

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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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• Flickering dual screens in Virtual Box Ubuntu 13.10 Guest

  - by alexleonard

  I have Ubuntu 13.10 x64 installed as a guest in VirtualBox (under a Windows 8.1 host) and have the settings for the virtual machine setup to run with a monitor count of 2, 128MB video memory and 3D acceleration enabled. In my guest I have the virtual box additions installed (which allowed me to have two 1920x1080 screens). Here's a screenshot of my VM settings. My laptop is an Asus N550JV which has both Intel's HD Graphics 4600 GPU and Nvidia's GeForce GT 750M. By default though I believe the Intel GFX card is being used to render the VM. When I boot up the VM it loads perfectly on dual screens, however whenever I move the mouse from one screen to the other (I have a Dell S2340L running over a HDMI connection as a second screen) the screen flickers. I've tried a variety of settings changes in both Ubuntu and the VM settings, but cannot seem to stop this screen flicker. I also used the NVidia control panel in Windows to force the dedicated graphics card to always be used but found that the display driver sometimes crashed whilst working in the VM, resulting in my VM session being destroyed, so I figured it's better to stick with the Intel GFX as that appears to be more stable. I also tried without 3D acceleration but that was much worse, and if I ran the VM with a low amount of graphics memory it really struggled. Here's my dmesg output: http://pastebin.com/1LJuYWMj (not sure if this is helpful in this situation). I read some posts suggesting changes to /etc/X11/xorg.conf but I don't appear to have an xorg.conf file. There were also a few posts (though related to Synergy) suggesting running xset -dpms but this command doesn't appear to have had any effect for me. As an additional note, I'm finding that window drawing in the guest is a little laggy/glitchy. For example, quickly scrolling through a web page may result in parts of the viewport displaying original content. Certainly I notice drawing issues most in the web browser, but it also impacts other software with parts of the window not being drawn when, say, switching between accounts in thunderbird. Any suggestions greatly appreciated!

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