Replacing disks in RAID
Hi, I've got Redhat 6.1 with kernel 2.2.12 and raidtools-0.90. I've made a raid array (raid-5) from 3 disks (/dev/hda1, /dev/hdb1, /dev/hdc1)-no spare disks. If the one disk (for expample /dev/hdb1) fail everything will be ok. Then I want to replace this bad disk with new one. What should I do to make this new disk work with array (without erasing data)... I mean, attach this disk to array, to have raid in state like in begining. Marcin Zurakowski ( [EMAIL PROTECTED] )
Re: Replacing disks in RAID
On Sun, Dec 19, 1999 at 02:05:24PM +0100, Marcin Zurakowski wrote:
Hi,
I've got Redhat 6.1 with kernel 2.2.12 and raidtools-0.90.
I've made a raid array (raid-5) from 3 disks (/dev/hda1, /dev/hdb1,
/dev/hdc1)-no spare disks. If the one disk (for expample /dev/hdb1)
fail everything will be ok. Then I want to replace this bad disk
with new one. What should I do to make this new disk work with
array (without erasing data)... I mean, attach this disk to array, to have
raid in state like in begining.
From the HOWTO:
8-8
6. Reconstruction
If you've read the rest of this HOWTO, you should already have a pretty good
idea about what reconstruction of a degraded RAID involves. I'll summarize:
Power down the system
Replace the failed disk
Power up the system once again.
Use raidhotadd /dev/mdX /dev/sdX to re-insert the disk in the array
Have coffee while you watch the automatic reconstruction running
And that's it.
8-8
--
: [EMAIL PROTECTED] : And I see the elder races, :
:.: putrid forms of man:
: Jakob Østergaard : See him rise and claim the earth, :
:OZ9ABN : his downfall is at hand. :
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Re: GPLed hardware RAID card driver?
jeremy smith [EMAIL PROTECTED] writes: DPT Decade PM1554U2, Mylex AccelRAID 150/250, ICP Vortex GDT6518RD, Syred Cruiser. However, none of the drivers seem to be offered in the kernel distribution, Look harder. Use grep. Mike.
Help:Raid-5 with 12 HDD now on degrade mode.
Hello, All. I have a trouble of HDD fail of raid-5,raid-0.90 on Redhat 6.0. Raid-5 is now working on degrade mode. Exactly, Iacan't repair or replace the failed HDD (to new HDD). Woule you tell me how to do recovery it? "/proc/mdstat" is as follows: [root@oem /root]# cat /proc/mdstat Personalities : [raid5] read_ahead 1024 sectors md0 : active raid5 sdm1[11] sdl1[10] sdk1[9] sdj1[8] sdi1[7] sdh1[6] sdg1[5] sdf1[4] sde1[3] sdd1[2] sdc1[1] 97192128 blocks level 5, 4k chunk, algorithm 2 [12/11] [_UUU] unused devices: none "sdb1[0]" is failed, I think. "/etc/raidtab" is as follows: # Sample raid-5 configuration raiddev /dev/md0 raid-level 5 nr-raid-disks 12 chunk-size 4 # Parity placement algorithm #parity-algorithm left-asymmetric # # the best one for maximum performance: # parity-algorithmleft-symmetric #parity-algorithm right-asymmetric #parity-algorithm right-symmetric # Spare disks for hot reconstruction #nr-spare-disks 0 device /dev/sdb1 raid-disk 0 device /dev/sdc1 raid-disk 1 device /dev/sdd1 raid-disk 2 device /dev/sde1 raid-disk 3 device /dev/sdf1 raid-disk 4 device /dev/sdg1 raid-disk 5 device /dev/sdh1 raid-disk 6 device /dev/sdi1 raid-disk 7 device /dev/sdj1 raid-disk 8 device /dev/sdk1 raid-disk 9 device /dev/sdl1 raid-disk 10 device /dev/sdm1 raid-disk 11 First, I restarted the PC and tryed "raidhotadd" and "raidhotremove" ,the result is as fllows: [root@oem /root]# raidhotadd /dev/md0 /dev/sdb1 /dev/md0: can not hot-add disk: disk busy! [root@oem /root]# raidhotremove /dev/md0 /dev/sdb1 /dev/md0: can not hot-remove disk: disk not in array! Next, I replaced HDD,/dev/sdb to new HDD, the result, system hung-up on boot time. With the message, "/dev/md0 is invalid." what should I do to recovery the Raid-5 from degrade-mode to normal mode? Makoto Kurokawa Engineer, OEM Sales Engineering Storage Products Marketing, Fujisawa, IBM-Japan Tel:+81-466-45-1441 FAX:+81-466-45-1045 E-mail:[EMAIL PROTECTED]
