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• Webserver: Performance impact when storing session files on /dev/shm

  - by GetFree

  I have a website runing on a typical setup: Linux, Apache, PHP, MySQL. However, what's not typical about it, is that it's getting tons of traffic (400,000+ visits a day) and so, efficiency is becoming more and more important to me. I'm constantly looking for things I could optimize and, right now, my attention is focused on PHP's session files. There's a hell lot of session files constantly being read and created on the /tmp directory. So my question is: Is it a good idea to store the session files in /dev/shm (tmpfs) in order to speed things up a little bit??

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• Finding optimal ddrescue command line options where Accuracy > Speed

  - by gav

  I'm read up a bit about this tool and obviously looked at the man pages. The trouble is that ddrescue takes so long I need to get the command right first time. I wasn't sure how to improve on the vanilla; $ sudo ./ddrescue -v /dev/disk0s5 MyVolImage.dmg MyVolRescue.log $ sudo ./ddrescue -v MyVolImage.dmg /dev/disk1s3 MyVolRestore.log From HSF+ to HSF+ drives Source (Broken) HDD is connected via USB 2.0 Dest HDD is inside MacBook I would choose accuracy over speed There seem to be a lot of options but I'm not sure how they impact quality and speed of recovery. Thanks, Gav

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• Standard for feeding test data to a Nagios plugin?

  - by chiborg

  I'm developing a Nagios plugin in Perl (no Nagios::Plugin, just plain Perl). The error condition I'm checking for normally comes from a command output, called inside the plugin. However, it would be very inconvenient to create the error condition, so I'm looking for a way to feed test output to the plugin to see if it works correctly. The easiest way I found at the moment would be with a command line option to optionally read input from a file instead of calling the command. if($opt_f) { open(FILE, $opt_f); @output = <FILE>; close FILE; } else { @output = `my_command`; } Are there other, better ways to do this?

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• Ways to increase my Ubuntu partition space

  - by Andreas Grech

  I am currently running Ubuntu and Windows 7 as dual-boot on a single HD. The problem is that when I installed Ubuntu, I didn't allocate as much space as I thought I would need and now I need 'reinstall' Ubuntu so that I can increase the amount of storage space. Now there are two ways to go about this. Either I use use gparted to increase my partition space (but I read that it's not really that safe as regards data loss) or create the new partition with more space and reinstall Ubuntu there. But if want to reinstall Ubuntu, is there a way I can somehow "save" my current Ubuntu and install that one? What I mean is that I don't want to lose my current installed packages and files that I have on this partition. Is there a way to kind of maybe 'streamline' my current Ubuntu so that I install this one on the new partition? If not, what are your opinions as regards gparted?

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• Thunderbird 16.0.1 with IMAP on Gmail on Windows 7

  - by Joe M

  My Thunderbird Trash folder is messed up and it does not get fixed by "Repair Folder". When I delete a message it goes into the Trash folder but if I try to access the message, I get a pop-up error message: The current operation on Trash did not succeed. The mail server for account for the XXX imail Gmail account responded: Some messages could not be FETCHed The message count in the Trash folder continues to increase. If I look in the Gmail trash folder I can read the deleted messages. Unlike other users that have reported this problem I cannot find a corrupted message in the Gmail Trash folder. In fact I do not find any corrupted messages in my any of Gmail labels.

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• Is FreeBSD better than CentOS for firing 40k concurrent connections (for Jmeter)?

  - by blacklotus

  Hi, I am trying to run Jmeter to simulate 40k concurrent users and stress test a particular system. Putting aside the possibility that Jmeter may not be able to push such a high number (although I have read that it is at least possible to handle 10k concurrent threads on a very powerful machine), is FreeBSD a better OS as compare to CentOS to be used for my Jmeter machine? Reason for asking this is that, I have found articles on FreeBSD for tuning and optimizing for maximum outbound connections, but seem to have little luck with CentOS. Personally however, I am more familiar with CentOS and would like to stick with it if possible. Any input is greatly appreciated!

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• Emacs eshell over SSH not obeying key commands or elisp

  - by Brad Wright

  When SSHing to a remote server Eshell doesn't behave very well, e.g: M-x eshell ssh server <tab> *inserts literal tab instead of trying to complete* Hitting <tab>, for instance, inserts a literal tab. Is there no way to get tab completion, lisp interaction (like find-file blah) etc. over SSH? All the documentation I've read says Eshell is "TRAMP-aware", which I assume meant it could deal with this. Am I just wrong in my assumption that it would work over SSH, or is something broken? This is on Emacs 24.0.94 pretest.

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• Where should I plug in my monitor -- Motherboard or Graphics card?

  - by Jeremy White

  Assuming I am using the following equipment... motherboard with HDMI/DVI & no embedded graphics discrete graphics card (nVidia or ATI) on PCI-E slot Intel CPU with integrated graphics ...where should I plug my monitor into the computer? Presumably, I'll get the fastest speed on games connected directly to the graphics card. But there is also power savings when connecting to the motherboard and accessing the Intel on-board graphics. I've read that some motherboards can switch automatically between the Intel graphics and discrete graphics. Is that something that works well, and where do I connect the monitor to enable that?

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• Folder cannot be deleted

  - by Aaron

  I am using Windows XP Home Edition. When I try to delete a folder I have named cygwin. When I try to delete it or any file or folder within it, there is a long pause, and then an error pops up, saying: Cannot delete Cygwin: Access is denied. Make sure the disk is not full or read-write protected and that the file is not currently in use. I have tried deleting the folder and the files it contains with FileAssassin, and unlocking it with LockHunter. Neither report any errors unless I try to have them delete the file or folder, then I get an error message saying Access Denied. I have rebooted into Safe Mode to change the ownership, but I get Access Denied when I click OK or Apply. How can I delete this folder?

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• SVN Error when connecting from MacBook

  - by user66850

  This is drying me nuts for last 5 days!!! Out of the blue 5 days ago, SVN access from my MacBook Pro failed: I cannot access any SVN (i.e. not in our University or open source projects etc). The error obtain when performing 'svn co', or any other svn commands is shown below. This is same message is obtained irrespective of the svn repository (i.e. it is something due to my Macbook) svn co http://anonsvn.internet2.edu/svn/i2mi/branches/GROUPER_1_6_BRANCH/ svn: OPTIONS of 'http://anonsvn.internet2.edu/svn/i2mi/branches/GROUPER_1_6_BRANCH': Could not read status line: connection was closed by server (http://anonsvn.internet2.edu)

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• Can't edit a specific document in Word 2007

  - by Benjotron

  I have a document in Word 2007 that seems to be read only. There are forms in the document that I can type in, but I can't edit or reformat the rest of the document. There is probably a setting somewhere I can flip to make it editable again but I can't find it for the life of me. FOLLOW UP: The "Protect Document" button only had "Unrestricted Access" checked, this was one of the first things I checked. However, when I tried checking "Restrict Formatting and Editing" it brought up the Restrict Formatting and Editing sidebar, which stated: This document is protected from unintentional editing. You may only fill in forms in this region. With a stop protection button on the bottom, which of course solved the problem. I think that menu item just has a bad name, it should be "Restrict Formatting and Editing Options or Settings"

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• Is there a way to get att.net email to stay connected?

  - by Clay Shannon

  My att.net account at home (wireless connection) has been bad for the last several days: I have to hit F5 quite a few times to "unfreeze" it (I can read an email or two, then it freezes, etc.). At work (company LAN) it's even worse: I can connect to the site and see that I have email, but can't open any of the emails - and the screen constantly refreshes (every couple of seconds) with a "Connecting..." message. It apparently connects and disconnects over and over again, but never stays connected long enough to actually access the email. Is there a way either to fix this OR forward my att.net (from home) to my work email address (accessible via MS Outlook)? Or set it up from work using Outlook to pull in my att.net email? I have Outlook 2003 at work.

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• IIS 7 throws 401 responses on application whose physical directory has been shared

  - by tonyellard

  I have an IIS 7, Windows Server 2008 R2 box with a relatively fresh install. I've deployed a .NET 2.0 application using windows autentication to the server, and from the default website, added it as an application. I updated the IIS authentication to enable Windows Authentication. When I went to share out the physical directory for the application so that a developer could deploy updates, the users began to receive 401 errors. I can reliably recreate the issue by sharing out the directory of any newly created application. The IIS user has the necessary read/write access to the directory. What do I need to do to keep web users from receiving 401's while at the same time allowing this developer to have access to the physical directory for deployments? Thanks in advance!

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• Networking conflict - What is the most common default computer name?

  - by John

  I recently had to change the name of my computer to log onto a public wi-fi spot, because a computer with my name was already logged on. (I asked a guy there what to do after it said there was already a computer named "Dell(omitted)" logged on.) I've never been at a wifi spot that you had to log into before. I didn't even notice what the computer's name was before. My question is what are the most common default computer names. I'm curious. How often does this sort of problem happen? (I read via Google that Redhat linux default to "localhost" and Toshiba laptops default to "Toshiba.") Somebody probably keeps statistics. (I was referred here from serverfault.com) Thanks

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• "Slave" user accounts in GNU/Linux

  - by Vi

  How to make one user account to be like root for some other user account, e.g. to be able to read, write, chmod all it's files, chown from this account to master and back, kill/ptrace all it's processes and to all thinks root can, but limited only to that particular slave account? Now I'm simulating this by allowing "master" user to "sudo -u slaveuser" and setting setfacl -dRm u:masteruser:rwx ~slaveuser. It is useful as I run most desktop programs in separate user accounts, but need to move files between them sometimes. If it requires some simple kernel patch it is OK.

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• Pygrub with DRBD on Xen 3.2

  - by Joril

  Hi all, we have a two-node cluster using DRBD 8.2 on CentOS 5.2 64bit. The cluster runs a few VMs on top of Xen 3.2.1, here's the configuration for an Ubuntu Jaunty VM: name = 'dev' bootloader = '/usr/bin/pygrub' memory = '512' vif = [ 'ip=192.168.1.217,mac=00:16:3E:CD:60:80' ] disk = [ 'phy:/dev/drbd24,xvda1,w', 'phy:/dev/drbd25,xvda2,w' ] As you can see, the disks are specified like "phy:", and as such pygrub doesn't know a thing about the underlying drbd device... So my problem is that even though the VM boots just fine, it doesn't handle the state of the drbd device. As a result, when for some reason the device gets to a secondary/secondary state, the VM won't boot, and I have to manually specify which node is primary. I read that starting with Xen 3.3 pygrub understands the "drbd:" specification, and I think that it would fix my problem, but I can't upgrade Xen at the moment... Is there a workaround? For example, could I use the 3.3 version of pygrub? Thanks!

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• Why can't I share my printer on Windows 7?

  - by Edward Tanguay

  I have Windows 7 installed on two computers. I can share folders between them fine. However, I can't seem to share printers between them: when I right-click on the printer I expect to see "share printer" but there is no option for that. When I read about "share printers" in the Windows 7 help, it talks about this computer "not being able to connect to a home network", yet they seem to be connected fine (I can share files between them). Why can't I share printers between the computers if I can share files?

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• Is there still a place for tape storage?

  - by Jon Ericson

  We've backed up our data on LTO tapes for years and it's a real comfort to know we have everything on tape. A sister project and one of our data providers have both moved to 100% disk storage because the cost of disk has dropped so much. When we propose systems to potential customers these days we tend to downplay or not mention our use of tape systems for data storage since it might seem outdated. I feel more comfortable with having data saved in two separate formats: disks and tape. In addition, once data is securely written to tape, I feel (perhaps naively) that it's been permanently saved. Not having to rely on a RAID controller to be able to read back data is another plus for me. Do you see a place for tape backup these days?

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• Creepy MySQL error during hard work

  - by Kiewic

  Hi, I have a MySQL database installed on a OpenSuse 11.1 server (it is a Bitnami image). The database works fine, it can stay many days without any error, but when MySQL receives a huge amount of transactions, it dies immediately. The next screen shows the error: Moreover, I don't know how to restart MySQL. I have tried this: /opt/bitnami/mysql/bin/mysqld start But it doesn't work, that gives me the next output: 110209 17:09:01 [ERROR] Fatal error: Please read "Security" section of the manual to find out how to run mysqld as root! 110209 17:09:01 [ERROR] Aborting 110209 17:09:01 [Note] /opt/bitnami/mysql/bin/mysqld.bin: Shutdown complete It doesn't matter which kind of statements are executing, if they are a huge amount, MySQL dies. The MySQL server version is 5.1.30 What can be causing these sudden failures?

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• Windows 7 Long Delay on Login or Unlock

  - by Adam Driscoll

  I have a clean install of Windows 7 x32 running on my HP DV6449us and am experiencing a really long delay (10+ seconds) when unlocking or logging into my computer. The same issue was happening with UAC but I was able to turn that off. I realize this is a security risk but couldn't take it any more. I've read about this being video driver related but have updated the drivers to the newest I could find for the GeForce Go 6150. Anyone else experiencing this? My desktop is very happy but he's sporting a Nvidia 260 GT. Is it just the lack of firepower?

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• Restoring files from blueprint on command

  - by Nick

  I am setting up a server. I already have rented a machine running centOS 6 but I have run into a bit of a technical problem with configuring the server software: The server will have some files that it will try to read/write to them but what I need is a way to have a blueprint of these files and everytime the server restarts the files that it used get deleted and replaced by the blueprints. I have heared of a RAM disks or Virtual File Systems but didnt quite understand how they work or how to set them up. The server software is written in java which means bash commands can be run from it. I cannot modify what happens when the server shuts down entirely what I can do is run a command before the server runs the final shutdown save

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• How to access USB stick content from VMWare running Ubuntu 10.10?

  - by JVerstry

  Hi, I am running Ubuntu 10.10 via VMWare under Windows 7. I have followed the procedure to install the USB stick. It is now connected to the host. However, I don't know how to access the content of the stick. My Google research indicates that this may be a mounting issue. I read somewhere that I should check /proc/bus/usb, but the usb directory does not exist in /proc/bus. Unfortunately, I am not a Linux expert at this. The ultimate issue I am trying to solve is the one describe here. I am trying to use vi to create ~/.vmware/config, but it is virtually impossible to use vi, since I don't have access to the arrow keys (chicken & egg problem). I have created the config file on my usb stick and want to copy it where it should be. Thanks!

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• SQL Server 2012 and SQLMail - will it still work?

  - by Kharlos Dominguez

  We are considering upgrading our SQL Server, which is currently running 2005. We use SQLMail heavily in the organization, both to send e-mails and to import some into a database. I've read on various places that SQLMail was deprecated and superseded by "Database Mail". I'm confused because this MS page: http://msdn.microsoft.com/en-us/library/bb402904.aspx seems to imply that it would still work? I understand the dangers of SQLMail but we do not have the resources to rewrite the scripts right now and would prefer to do it later on. Does SQLMail still work in 2012, and if not, how easy is it to replace with Database Mail, both for reading and sending e-mails?

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• How to set up a PC which can be booted from Linux AND Windows?

  - by Martin

  Our PC was running Windows XP up to know. It has become incredibly slow and I'm considering switching to Linux (Ubuntu?!) as a fresh OS. However, there are some applications we rarely use which run only on Windows and I also want to have the possibility to easily go back to the old system, if I should find during testing linux, that anything is missing or not available. So the idea is to install Linux on a new (second) hard drive and use the existing Windows XP from a virtual machine (converted by Paragon Drive Backup) in the transition time. We have a lot of data on the PC, tens of GBs of Photos (managed by Picasa), ... My questions: What could be the best way to setup the new hard drive? (Partitions) I assume that I can not access the Linux data from Windows but I could access (read/write) windows drives from Linux? Does anyone know good tutorials for this use case? What other things might I have to consider for transition Windows-Linux?

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• Deleting Time Machine in Mac OS X 10.6.4

  - by cappuccino

  Does anyone know how to delete Time Machine in Mac OS X 10.6.4? Before answering: sudo rm -rf /whateverthetimemachineis does not work Disabling the ACL permissions first with sudo fsaclctl -p /whatever -d does not work, sudo: fsaclctl: command not found Use the delete all backup feature in Time Machine... this is slow as hell, would take days. Need a command line solution. No I don't want to reformat the drive, I have other content on it, and no don't say I should have separated on two partition or two drives, I did it this say since partitions cannot be dynamically changed, and two drives is annoying since, whats the point of having a big drive?... plus has no relation to the issue at hand. Already googlied for hours and read everything on Super User, nothing working. and all solutions are the first 4. Any clues?

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