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34758 discussions

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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Re: [CentOS] Install Help
by Bo Lynch 03 Mar '10

03 Mar '10

On Wed, March 3, 2010 4:17 pm, Slack-Moehrle wrote: > 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? Have you verified that packages actually exists on the DVD? Bo Lynch

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puzzling md error ?
by John R Pierce 03 Mar '10

03 Mar '10

this has never happened to me before, and I'm somewhat at a loss. got a email from the cron thing... /etc/cron.weekly/99-raid-check: WARNING: mismatch_cnt is not 0 on /dev/md10 WARNING: mismatch_cnt is not 0 on /dev/md11 ok, md10 and md11 are each raid1's made from 2 x 72GB scsi drives, on a dell 2850 or something dual single-core 3ghz server. these two md's are in turn a striped LVM volume group dmesg shows.... md: syncing RAID array md10 md: minimum _guaranteed_ reconstruction speed: 1000 KB/sec/disc. md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for reconstruction. md: using 128k window, over a total of 143374656 blocks. md: syncing RAID array md11 md: minimum _guaranteed_ reconstruction speed: 1000 KB/sec/disc. md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for reconstruction. md: using 128k window, over a total of 143374656 blocks. md: md10: sync done. RAID1 conf printout: --- wd:2 rd:2 disk 0, wo:0, o:1, dev:sdc1 disk 1, wo:0, o:1, dev:sdd1 md: md11: sync done. RAID1 conf printout: --- wd:2 rd:2 disk 0, wo:0, o:1, dev:sde1 disk 1, wo:0, o:1, dev:sdf1 I'm not sure what thats telling me. the last thing prior to this in dmesg was when I added a swap to this vg last week. and mdadm --detail shows... # mdadm --detail /dev/md10 /dev/md10: Version : 0.90 Creation Time : Wed Oct 8 12:54:48 2008 Raid Level : raid1 Array Size : 143374656 (136.73 GiB 146.82 GB) Used Dev Size : 143374656 (136.73 GiB 146.82 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 10 Persistence : Superblock is persistent Update Time : Sun Feb 28 04:53:29 2010 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 UUID : b6da4dc5:c7372d6e:63f32b9c:49fa95f9 Events : 0.84 Number Major Minor RaidDevice State 0 8 33 0 active sync /dev/sdc1 1 8 49 1 active sync /dev/sdd1 # mdadm --detail /dev/md11 /dev/md11: Version : 0.90 Creation Time : Wed Oct 8 12:54:57 2008 Raid Level : raid1 Array Size : 143374656 (136.73 GiB 146.82 GB) Used Dev Size : 143374656 (136.73 GiB 146.82 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 11 Persistence : Superblock is persistent Update Time : Sun Feb 28 11:49:45 2010 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 UUID : be475cd9:b98ee3ff:d18e668c:a5a6e06b Events : 0.62 Number Major Minor RaidDevice State 0 8 65 0 active sync /dev/sde1 1 8 81 1 active sync /dev/sdf1 I don't see anything wrong here ? lvm shows no problems I detect either... # vgdisplay vg1 Volume group "vgdisplay" not found LV VG Attr LSize Origin Snap% Move Log Copy% Convert glassfish vg1 -wi-ao 10.00G lv1 vg1 -wi-ao 97.66G oradata vg1 -wi-ao 30.00G pgdata vg1 -wi-ao 25.00G pgdata_lss_idx vg1 -wi-ao 20.00G pgdata_lss_tab vg1 -wi-ao 20.00G swapper vg1 -wi-ao 3.00G vmware vg1 -wi-ao 50.00G # pvdisplay /dev/md10 /dev/md11 --- Physical volume --- PV Name /dev/md10 VG Name vg1 PV Size 136.73 GB / not usable 2.31 MB Allocatable yes PE Size (KByte) 4096 Total PE 35003 Free PE 1998 Allocated PE 33005 PV UUID oAgJY7-Tmf7-ac35-KoUH-15uz-Q5Ae-bmFCys --- Physical volume --- PV Name /dev/md11 VG Name vg1 PV Size 136.73 GB / not usable 2.31 MB Allocatable yes PE Size (KByte) 4096 Total PE 35003 Free PE 2560 Allocated PE 32443 PV UUID A4Qb3P-j5Lr-8ZEv-FjbC-Iczm-QkC8-bqP0zv

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