Discuss March 2010

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295 participants
261 discussions

New to VM
by David Milholen 04 Mar '10

04 Mar '10

What are some min requirements for Hardware and what performance differences are there in just running another pid for an app? -- David Milholen Project Engineer 501-318-1300 Wireless Etc

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Re: [CentOS] help fdisk and dd
by Benjamin Donnachie 04 Mar '10

04 Mar '10

On 4 March 2010 14:01, Sorin Srbu <sorin.srbu(a)orgfarm.uu.se> wrote: > I second that. Dban is the niftiest thing since sliced bread. Very handy > tool, if a bit slow. But I guess that comes with the territory. 8-) The ATA Secure Erase command is generally faster but more difficult - see http://ata.wiki.kernel.org/index.php/ATA_Secure_Erase Ben

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removing a md/software raid device
by Bazy 04 Mar '10

04 Mar '10

Hello folks, I successfully stopped the software RAID. How can I delete the ones found on scan? I also see them in dmesg. [root@extragreen ~]# mdadm --stop --scan ; echo $? 0 [root@extragreen ~]# mdadm --examine --scan ARRAY /dev/md0 level=raid5 num-devices=4 UUID=89af91cb:802eef21:b2220242:b05806b5 ARRAY /dev/md0 level=raid6 num-devices=4 UUID=3ecf5270:339a89cf:aeb092ab:4c95c5c3 [root@extragreen ~]# mdadm --detail /dev/md0 mdadm: md device /dev/md0 does not appear to be active. [root@extragreen ~]# mdadm --detail /dev/md1 mdadm: cannot open /dev/md1: No such file or directory Thanks, Bazy

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Resync raid1 from disk with unreadable sectors
by Mindaugas Riauba 04 Mar '10

04 Mar '10

Hello, After some fiddling with the server now I have broken RAID1 with the "current" mirror on the disk with few unreadable sectors. If I try to re-add other disk to the mirror resync goes till those bad sectors and then starts from the beginning. And so on. Is it possible to somehow force resync to continue even after errors? Manual resync with dd would require a bit too long downtime. If it is impossible to force resync I'll probably manually rsync all the files from the old broken disk to the new one. Mindaugas

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splash screen resolution
by Michael Klinosky 04 Mar '10

04 Mar '10

I installed CentOS 5.3 on a desktop box, and I'm having a problem with the splash screen resolution (during bootup). I suppose that it somehow got configged when I set the GUI's screen (I run in level 5). I think that, in finding the highest res for the GUI, I went past the monitor's capability. But it's good now. During boot, I get a funny 'double' display (2 pointers, 2 sets of text). I can't find where to change it (thru the gui or manually). And, yes, I did try searching (on google.com/linux and the CentOS wiki). I didn't see anything in /boot/grub/grub.conf that would set the res. I read about removing 'rhgb'; I tried it, and at least it uses an appropriate resolution. But, I'd like to use the graphical boot screen. How do I fix this?

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SSH Remote Execution - su?
by Tim Nelson 04 Mar '10

04 Mar '10

Greetings All- I'm about to embark on some remote management testing and need a way to login to a remote system running CentOS 4.x/5.x via SSH, su to root (using a password), then execute a command. I currently login to the boxes using key based SSH like this: ssh -i ~/remote_key admin@$REMOTEIP Then, I SU to root. However, if I try to do this automatically like this: ssh -i ~/remote_key admin@$REMOTEIP 'su -l' I'm getting: "standard in must be a tty" So, how am I able to remote login using SSH, su to root, then execute a command as root? All comments and suggestions welcome. Thanks! --Tim

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Re: [CentOS] Recover RAID
by Timo Schoeler 04 Mar '10

04 Mar '10

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 thus Sorin Srbu spake: > From: centos-bounces(a)centos.org [mailto:centos-bounces@centos.org] On Behalf > Of Jeff Sadino > Sent: Thursday, March 04, 2010 6:15 AM > To: CentOS mailing list > Subject: Re: [CentOS] Recover RAID > > Backups? I wish :) I will now. > But looking closer, that md1 is not my OS partition, just a data partition. > If I take that md1 entry out of the raidtab file and restart the computer, I > would think that it would start up just fine, minus the data partition (and > for the moment neglecting any vital programs that might be installed on that > partition). My question is when I start the computer back up, in order to > start up without that partition there any more, will the OS write any new > files or anything that will not be reversible? > ---- > > Eh? Raid0 with no backups? For real? Backups are for sissies; running a hara-kiri RAID demands *not* having backups. Or did the kamikaze pilots have parachutes? SCNR -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (GNU/Linux) iD8DBQFLj14Efg746kcGBOwRAuicAJ4uNeMpsbc9N0dSbOUe0JFkh4hXrgCeJtbb b/cpUWfQxgfxTjLPo7TWwsQ= =t8zn -----END PGP SIGNATURE-----

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Recover RAID
by Jeff Sadino 04 Mar '10

04 Mar '10

Hello Everyone, First time CentOS poster :) I have CentOS 4 installed on the head node of a Sun Gridengine cluster set up in a RAID. The head node has four hard drives, and I assume that drives 1 and 2 are in a raid and then drives 3 and 4 are in another raid. I was trying to expand the OS partition on drive 1 because it was full. I took drive 1 out, put it in my Fedora 8 box as a secondary drive, booted up into Fedora, and saw it had the partition structure: / 8GB /var 4GB /swap 1GB and an "unknown" partition 101.4GB I did a cp -rfa on the / and /var files for a backup (I know, not the best way). Restarted my Fedora into Windows to take a look at it using Paragon Partition Manger. Restarted into Fedora and using gparted, formatted the "unknown" partition as ext3 - I think that is where I made my fatal mistake - and moved the /swap to the middle of the drive, moved the /var to the middle and expanded to 10GB, and then expanded / to about 50GB to fill up the rest. I had also took drive 2 out of the head node and into my Fedora, and saw it had the partition structure: /swap 15GB and an "unknown" partition 101.4GB Ok, now when I put everything back into the head node, and reboot, the BIOS sees all four drives, and from what I can tell, recognizes the first raid (of drives 3 and 4), but says it can only find one disk for the second raid (drives 1 and 2). I can't find any way around this. Looking at my /etc/raidtab file: raiddev /dev/md0 raid-level 1 nr-raid-disks 2 nr-spare-disks 0 persistent-superblock 1 device /dev/sdc1 raid-disk 0 device /dev/sdd1 raid-disk 1 raiddev /dev/md1 raid-level 0 nr-raid-disks 2 persistent-superblock 1 chunk-size 4 device /dev/sda4 raid-disk 0 device /dev/sdb2 raid-disk 1 It says it can bring up md0 ok, but not md1. Right now, I am going to try to restore the "unknown" partition that I deleted from drive 1 using the "unknown" partition from drive 2. Any ideas on how to get myself out of this mess? I feel like I really messed it up good. This is a server for our work, and we have a couple years worth of data on it, so I would really like to fix it rather than reinstall. Thank you greatly for any help! Jeff Sadino

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fsck.ext4 huge memory usage
by James A. Peltier 04 Mar '10

04 Mar '10

I have a 5.4TB file system, ext4, that currently is reporting problems, however, every time I run fsck.ext4 on the file system, it grows to more than 17GB. Can anyone tell me WTF is going on here? Why is it using so much disk space? -- James A. Peltier Systems Analyst (FASNet), VIVARIUM Technical Director HPC Coordinator Simon Fraser University - Burnaby Campus Phone : 778-782-6573 Fax : 778-782-3045 E-Mail : jpeltier(a)sfu.ca Website : http://www.fas.sfu.ca | http://vivarium.cs.sfu.ca http://blogs.sfu.ca/people/jpeltier MSN : subatomic_spam(a)hotmail.com TEAMWORK There's power in numbers. Learn to work together.

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Install Help
by Slack-Moehrle 04 Mar '10

04 Mar '10

Hi All, I have a new system that is dual AMD's. I have a CentOS 5.4 x64 dvd. I power on the machine It boots to the CentOS media I had in the dvd drive I start the install it comes up and asks me where I have CentOS, I select 'Local CD' and I get that a message saying CentOS install files cannot be found. Strange because it boots to it! What could be the issue? I have 1 320gb Sata Drive connected to onboard Sata and that is where I want to install. The DVD drive is connected IDE to the mobo I have two 3ware raid cards each can handle 8 drives, but I have not put drives in yet. I am just trying to make sure everything works before I go that route. The 16 drives will be storage only. Linux Software Raid. Any thoughts? -Jason

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Discuss March 2010