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• aligning truecrypt partition on 1.5TB 4kB sector drive

  - by pQd

  hi, aligning partitions to start at real physical sector of ssds / stripped raids / 4kB drives is a 'good thing to do'. but i've run into a problems when trying to do it for a truecrypt partition that will contain ext3 on it. or so it seems. when drive is question is partitioned properly and formatted with ext3 i get very reasonable write speeds around 70-80MB/s, but when i put truecrypt and ext3 on the top of it write performance becomes very unstable and goes between 1-25MB/s with very high io-wait. on the same server i dont have any performance issues with ext3 on the top of truecrypt on regular 512B-sector 500GB sata disks. so my best guess is that iowaits are caused by misalignment but i cannot really find reliable information on how to calculate optimal partition beginning. i've tried to start it at 128 logical sector, i've also tried 8132 sector as suggested here but both gave me very bad and unstable performance. do you have any experience with similar setup? thanks!

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• Computer Components

  - by Martin

  What is the role of a motherboard in terms of how components communicate with the processor (via the system busses). Therefore, for each component, which communication bus is involved and what is the route that data takes from the component to the processor, including; The bus name Whether bus is serial or parallel The name of any bridges involved Also, what is the the role of a bridge The components are: Internal components: Floppy Drive, Hard Drive, CD/DVD Drive, Memory, Processor Power supply, Graphics card & Sound card External devices: Monitor, Keyboard, Mouse (PS2 & USB), Printer, Pen Drive I have absolutely no idea of what the routes are and how motherboards communicate, could someone give me a start here? Thanks.

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• Computer not acknowledging sound card after move

  - by Angela

  We just got our computer back from having moved and when I tried to hook our speaker system, the computer keeps telling me that I don't have a sound system installed. It's a Dell computer with the original surround/subwoofer system that it came with and was working fine before the move. I tried buying a new speaker system (Logitech) to see if it would work, but still saying I have no audio device installed and it's not showing up in my device manager. I opened up the computer and unplugged the sound card, then plugged it back in, still nothing. I put the install disc from the sound card in the cd-rom, but it's saying that I have no sound device hardware in my system.

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• Couldn't dual boot Vista and Centos 5.4

  - by jack sparrow

  Hi all, Today I have installed Centos 5.4 with dual boot with Vista. Everything was fine, but after testing Centos 5.4, when I tried to load Vista, it did not load. After selecting vista from grub menu, it shows the following message: rootnoverify (hd0, 1) chainloader +1 No bootmgr found I googled and try to fix the boot but failed, Then I restart my machine, boot with vista cd and in rescue option, restore my bootmgr by typing bootrec /fixmbr What happened after that, I can load at vista now, but no grub menu shows :P It seems the Centos went totally invisible. I am using dual booting Ubuntu 9.10 and vista in my laptop and its working fine and with no error from the beginning. But installed Centos for one of my project needs and I need it running asap. So I am feeling very helpless. Please help me anyone out there. I know there are many people knows how to fix it. Please help me.. Thanks in advance.

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• vmware linux headers not found for ubuntu 10.10 ?

  - by Tumbleweed

  I've installed Vmware 6.5 on Ubuntu 10.10... when I start vmware player/workstation its asking for linux kernel header for some compilation but I'm not able to find the appropriate package, see the Image below.... Update after running following commands sudo -s cd /lib/modules/$(uname -r)/build/include/linux ln -s ../generated/utsrelease.h ln -s ../generated/autoconf.h Error has been changed like below.... ERROR: modinfo: could not find module vmmon ERROR: modinfo: could not find module vmnet ERROR: modinfo: could not find module vmblock ERROR: modinfo: could not find module vmci ERROR: modinfo: could not find module vsock Using 2.6.x kernel build system. make: Entering directory /tmp/vmware-root/modules/vmmon-only' make -C /lib/modules/2.6.35-22-generic/build/include/.. SUBDIRS=$PWD SRCROOT=$PWD/. modules make[1]: Entering directory/usr/src/linux-headers-2.6.35-22-generic' CC [M] /tmp/vmware-root/modules/vmmon-only/linux/driver.o In file included from /tmp/vmware-root/modules/vmmon-only/linux/driver.c:31: /tmp/vmware-root/modules/vmmon-only/./include/compat_wait.h:78: error: conflicting types for ‘poll_initwait’ include/linux/poll.h:72: note: previous declaration of ‘poll_initwait’ was here

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• What type of malware can reside in windows restore?

  - by qwertymk

  I was reading aking1012's comment on How to create Windows Vista/Windows 7 Startup disk or Rescue disk or system restore points on a CD? . He says that: The first thing I usually do is disable system restore. Some REALLY nasty malware hides in there and is very difficult to delete. As far as rescue media, I make a full backup image. It doesn't directly address the question so it's a comment not an answer, but I thought it was worth noting What type of malware can hide there, and how is that possible as the restore info must be stored with a checksome to make sure it's not modified, right?

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• Which are the most important directories to backup on a Linux server?

  - by QAH

  Hello everyone! I'm running an Ubuntu 9.10 Linux server. I'm trying to find a way to backup the machine while it is running and from what I see, this eliminates the disk clone utilities. All of the disk clone stuff I have seen for Linux requires that you reboot into a special live CD. So my question is this, what is the best solution for backing up the system while it is running? Also, I don't really care about the OS config too much, I just want to be able to keep my stored files and my programs that I have installed on it. Thanks

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• CentOS (rel6) with default python 2.6, but seperate 3.3.5 installation

  - by Silvertiger

  I have a CentOS server (rel6) that had python installed (2.6), but I needed a few features in 3.3+. I installed 3.3 into a seperate folder and made a symbolic link to execute it: I installed setup tools: yum install python-setuptools I installed a needed module"pandas" easy_install pandas I executed my pyton script, which encountered an error that required i use a newer version I downloaded and installed Python 3.3.5 to it's own folder so as to not override my default python wget http://www.python.org/ftp/python/3.3.5/Python-3.3.5.tar.xz tar xJf ./Python-3.3.5.tar.xz cd ./Python-3.3.5 ./configure --prefix=/opt/python make make install Made s symbolic link to allow me to execute this new python: ln -s /opt/python3.3/bin/python3.3 ~/bin/py The problem is that when I execute the python script with my new py alias, it does not have all the addons needed (explicitly MySQLdb) which the default install does. How do i go about installing the MySQLdb module, or any for that matter, to be reachable or useable for the new Python 3.3.5 installation? Or is there a way to make the current modules in 2.6 available to 3.3.5 as well?

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• Perform shell operation through secure shell

  - by Ben

  Is it possible to perform a shell operation from a bash script through a secure shell. Here is an example of why you may want to do this. Lets say you have a simple unix operating system that you need only build and run on, but you want to do all of the development on another machine. I want to write a bash script that has the following functionality: scp file to location on other machine ssh to other machine cd into correct directory make run program scp results to file on original computer exit ssh Is this remotely possible? (Pardon the Pun :p)

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• Automatically convert audio files in a certain folder

  - by Pat

  Anyone know of an application that automatically* converts audio files in a certain folder from one format to another? *By automatically, I mean that there is no user interaction besides initial setup and dropping files into a certain folder. So, basically, I could rip a CD to a certain directory in FLAC format, then this app would see that new files were added to the folder and convert them to MP3s (into another folder, preferably). (It would also be great if the app integrated with MusicBrainz's Picard to rename and re-tag files that are incorrect before sending them to the converter, but that's just icing on the top.)

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• How to move a windows machine properly from RAID 1 to raid 10?

  - by goober

  Goal I would like to add two more hard drives to my current RAID 1 setup and create a RAID 0 setup on top of the two RAID 1 setups (which I believe is referred to as "RAID 10"). Components Involved Intel P68 Chipset Motherboard 4 SATA ports that can be configured for Raid An intel SSD cache that sits in front of the RAID, and a 64 GB SSD configured in that manner Two 1TB HDDs configured in RAID 1 OS: Windows 7 Professional Resources Consulted so far I found a great resource on LinuxQuestions.org for a good "best practices" process for Linux machines, but I'd like to develop a similar process that I know works on Windows Machines.

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• How would I put together a site requiring several TB? [closed]

  - by acidzombie24

  Lets say I have a site with unmetered 100MBPS bandwidth (i assume its bits?) and the ram i require. Most plans i see offer HDD that hold 250gb and 1TB. But what happens if i compile/generate enough data that i require 10tb or 25tb? (I'd likely have two servers but...) I wouldn't be serving all of that data (well not to the public) so CDN wouldn't make sense. What do i do in this scenario? Do I need to get a custom plan from a hosting provider? (if so how do i find them?) Are there services that allow me to mount remote drives (that sounds wrong unless its a CDN so maybe not). Are there host that deals specifically with unmetered bandwidth and provides lots of disk space? Math says ~1TB is the most i'll ever need but if i happen to need more i'd like to know my options.

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• why is usb disk corrupted by Vista restore

  - by Martin

  I have a laptop with Vista Business on an 80GB disk. I have created a full backup and stored that on the original 80GB drive. On my new 320GB disk, I have created a partition with exactly the same number of bytes as the original 80GB disk. I swap the disks so that the 320GB is internal, and the 80GB is in a USB caddy. I boot from the NEO restore CD and everything looks fine: I select the dump on the USB drive, target is drive C:, start the restore. After a few seconds, the restore fails with "not enough disks in machine or disk not large enough" error (I did note the exact phrase). I then swap the 80GB disk back to the internal drive, but the thing is unbootable. Why has the restore process scrubbed the boot status of the USB drive ?

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• Partition table correpted in windows 7 machine as simple dynamic partition

  - by raki

  I have Windows 7 installed in my system. When I originally partitioned it I made 3 partitions and 16 gb space as unallocated. Later I tried to create a partition using this free space using diskmanagement tool. It shows free space as unusabe space and the only one option available is to make it as a simple partition. Unfortunately I made it as simple partition and all my partitions converted to simple dynamic partition. Now after reboot the OS is not loading. I tried to reinstall the OS by formatting the C drive, but it doesn't work. Now I can't load the OS properly. How can I install Windows 7 on my system without losing my data on the other two drives?

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• Why can't add a hot spare in freebsd? Can anybody help me fix it?

  - by hamlet

  Why can't add a hot spare? Can anybody help me fix it? mfiutil add e1:s1 mfid0 mfiutil: Drive 1 is not available My mfi status:: mfiutil show config mfi0 Configuration: 1 arrays, 1 volumes, 0 spares array 0 of 2 drives: drive 0 ( 137G) ONLINE <HITACHI HUS153014VLS300 A410 serial=JFWHSB4C> SAS enclosure 1, slot 0 drive 1 ( 137G) ONLINE <HITACHI HUS153014VLS300 A410 serial=JFWJ3AEC> SAS enclosure 1, slot 1 volume mfid0 (136G) RAID-1 64K OPTIMAL spans: array 0 mfiutil show events 1468 (boot + 25s/BATTERY/WARN) - Battery removed 1475 (boot + 52s/DRIVE/WARN) - PD 00(e1/s0) is not a certified drive 1478 (boot + 52s/DRIVE/WARN) - PD 01(e1/s1) is not a certified drive 1480 (boot + 64s/BATTERY/WARN) - BBU disabled; changing WB virtual disks to WT mfiutil show volumes mfi0 Volumes: Id Size Level Stripe State Cache Name mfid0 ( 136G) RAID-1 64K OPTIMAL Disabled

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• A black screen with only the mouse cursor while booting

  - by akb.zak

  Once i tried to re-install Windows 7. I formatted C drive, during installation system was hanged during the step "installing updates". then i cancelled the process. When i tried again, after booting from CD a black screen with a mouse pointer appears. No further progress. The mouse pointer can be moved. I tried with some other disks also. I tried with installing ubuntu also. Even though similar condition.plz help........... I cannot install an OS

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• What is the fastest way to reload history commands begin with certain characters in linux?

  - by gerry

  In Dos we can input the first several characters to filter command history and find proper one rapidly. But how to do the same thing in Linux ? for example when I am testing a local server: cd sudo /etc/init.d/vsftpd start wget ... ls emacs ... sudo /etc/init.d/vsftpd restart sudo /etc/init.d/vsftpd stop ... In Dos you can easily type sudo and switch among the three commands beginning with it using arrow keys. But in Linux, is below command the best we can do ? historty | grep sudo I don't like it, because history can easily become a mess, and it also need mouse action.

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• MacBook Pro shutting down instantly after attempt to update firmware

  - by Luke Dennis

  I tried to apply a firmware update on a MacBook Pro 2.4ghz (2008), and after rebooting, the fans kicked up to maximum, the screen lit up, and then it immediately died. Now when I try to boot, it does the same thing: the fans crank to max, the screen lights up, and then it dies after about 2 seconds. Resetting the power manager does nothing. It doesn't stay up long enough to choose another boot drive or boot from CD. I have no idea what else to try. Help?

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• Cobalt Qube 3 Unresponsive

  - by Devin Gund

  I recently bought a used Cobalt Qube 3 server off of eBay. The seller listed it as working before it was shipped. After starting it up for the first time, the "Cobalt Networks" logo scrolled across the LCD screen (this is normal), but then it stayed there. It will not go away, and the server will not respond to any of the buttons besides turning it off. I read the manual, and it does not say anything about this normally occurring. If necessary, could anyone walk me through or provide links to a reset tutorial? I have the OS Restore CD. Please help? I'm not sure why my question is being downvoted but if you need any more information please comment.

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• How do I compile mercurial 1.5.2 on debian?

  - by Aaron Digulla

  I downloaded the files for Mercurial 1.5.2 from http://packages.debian.org/sid/mercurial (mercurial_1.5.2-1.debian.tar.gz, mercurial_1.5.2-1.dsc and mercurial_1.5.2.orig.tar.gz). How do I get a .deb package out of these? I tried to follow the instructions at http://www.debian.org/doc/maint-guide/ch-build.en.html but they don't work. I tried to unpack the two archives and run dpkg-buildpackage or debian/rules build but that fails with: dh --with quilt clean dh_testdir debian/rules override_dh_auto_clean make[1]: Entering directory `/home/user/packages/mercurial-deb' cp -a mercurial/__version__.py mercurial/__version__.py.save cp: cannot stat `mercurial/__version__.py': No such file or directory make[1]: *** [override_dh_auto_clean] Error 1 make[1]: Leaving directory `/home/user/packages/mercurial-deb' make: *** [clean] Error 2 That's because the directory mercurial is inside mercurial_1.5.2/. Why doesn't the build script cd into the right place? If I try ../debian/rules build, I get dh --with quilt build dh: cannot read debian/control: No such file or directory sigh How do I compile a package for debian???

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• Using a non-validated SED on a Dell R720

  - by a coder

  We were given a Dell R720 a couple years ago, and the machine currently has standard 300GB 3.5" SAS 15k drives. Our RAID controller is a Perc H710. We need to update our disks to FIPS 140-2 certified SED. According to Dell, they have only one tested/validated FIPS SED for this machine/controller, but it is a 7200rpm 3.5" unit. I'm showing that Dell offers a 600GB 15k FIPS SED in 3.5" configuration (Dell part number 342-0605), but they say they haven't validated or tested to know if it works. They informed us that we would not void our warranty in using this non-validated drive. How likely is it that our R720 with H710 controller will work with the non-validated drive? Are there significant differences in how drive manufacturers build SED that would prevent them from working consistently across different controllers?

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• Is TrueCrypt robust against data corruption?

  - by Dimitri C.

  I would expect a TrueCrypt volume to be fragile when it suffers from data corruption. This could happen for example because the hard disk, CD or DVD start to deteriorate, or when an USB stick is unplugged while a write is in progress. On the TrueCrypt FAQ it is mentioned that this problem is limited because the data is encrypted in blocks of 16 bytes. However, I'dd like to know if this really so in practice. Is there anyone who has experienced severe data loss due to only small corruptions?

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• How Often Do Windows Servers Need to be Restarted?

  - by Evan

  A little background: We have several Windows servers (2003, 2008) for our department. We're a division of IT so we manage our own servers. Of the four of us here I'm the only one with a slight amount of IT knowledge. (Note the "slight amount".) My boss says the servers need to be restarted at least weekly. I disagree. Our IT Department says that because she restarts them constantly that's the reason why our hard drives fail and power supplies go out on them. (That's happened to a few of our servers a couple times over the last four years, and very recently.) So the question is: How often does everyone restart their Windows servers? Is there an industry standard or recommendation? Is our IT department correct in saying that because we re-start that's why we're having hardware issues? (I need a reason if I'm going to change her mind!)

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• courier-imap w mysql : share a folder between 2 virtual users on debian

  - by Michael

  Hi I have a working courier-imap server on my Debian Etch private server ; users are virtual, authentificatin goes through mysql. It's been working good for years. I would like to share an imap folder between 2 users. I thought I would just have to do something like this : cd path/to/mailusers/dir ln -s path/to/user1/maildir/.folder_to_be_synched path/to/user2/maildir/ After I entered the command, I found that user2 saw a new folder in its imap client, but the folder appeared empty. It is not a permission problem because all the virtual users have the same permissions on the file system. Any idea what I could do ? thanks

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• How many hours of use before I need to clean a tape drive?

  - by codeape

  I do backups to a HP Ultrium 2 tape drive (HP StorageWorks Ultrium 448). The drive has a 'Clean' LED that supposedly will light up or blink when the drive needs to be cleaned. The drive has been in use since october 2005, and still the 'Clean' light has never been lit. The drive statistics are: Total hours in use: 1603 Total bytes written: 19.7 TB Total bytes read: 19.3 TB My question is: How many hours of use can I expect before I need to clean the drive? Edit: I have not encountered any errors using the drive. I do restore tests every two months, and every backup is verified. Edit 2: The user manual says: "HP StorageWorks Ultrium tape drives do not require regular cleaning. An Ultrium universal cleaning cartridge should only be used when the orange Clean LED is flashing." Update: It is now May 2010 (4.5 years of use), and the LED is still off, I have not cleaned, backups verify and regular restore tests are done.

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