Hi,
Motivation, existing RAID-6 swap partition failed. I am thinking I should recreate it in a new format, as currently it is 'Version : 0.90', rather than simply rebuild it.
So 3 questions:
(1) What further diagnostics should I run first, if any (note I am currently running badblocks on the drive that dropped out), and I have put the existing diagnostic info at the end of this email
(2) What is the most appropriate RAID-6 format for a swap partition, keeping same the number of drives and overall capacity.
(3) How to convert the existing /dev/md0 to the new format.
Cheers,
Gavin
# grep md0 /var/log/messages
May 16 04:05:47 saturn kernel: [ 3.658644] md: md0 stopped.
May 16 04:05:47 saturn kernel: [ 3.933910] md/raid:md0: not clean -- starting background reconstruction
May 16 04:05:47 saturn kernel: [ 3.937796] md/raid:md0: device sda3 operational as raid disk 0
May 16 04:05:47 saturn kernel: [ 3.941540] md/raid:md0: device sdb3 operational as raid disk 4
May 16 04:05:47 saturn kernel: [ 3.945161] md/raid:md0: device sdd3 operational as raid disk 3
May 16 04:05:47 saturn kernel: [ 3.948706] md/raid:md0: device sdc3 operational as raid disk 2
May 16 04:05:47 saturn kernel: [ 3.953408] md/raid:md0: allocated 5334kB
May 16 04:05:47 saturn kernel: [ 3.956939] md/raid:md0: cannot start dirty degraded array.
May 16 04:05:47 saturn kernel: [ 3.961082] md/raid:md0: failed to run raid set.
May 16 04:05:47 saturn kernel: [ 3.968237] dracut: mdadm: failed to RUN_ARRAY /dev/md0: Input/output error
May 16 04:05:47 saturn kernel: [ 4.239948] dracut: mdadm: /dev/md0 is already in use.
May 16 04:05:47 saturn kernel: [ 4.340048] dracut: mdadm: /dev/md0 is already in use.
May 16 04:08:28 saturn kernel: [ 3.038486] md: md0 stopped.
May 16 04:08:28 saturn kernel: [ 3.205219] md/raid:md0: not clean -- starting background reconstruction
May 16 04:08:28 saturn kernel: [ 3.206711] md/raid:md0: device sda3 operational as raid disk 0
May 16 04:08:28 saturn kernel: [ 3.208501] md/raid:md0: device sdb3 operational as raid disk 4
May 16 04:08:28 saturn kernel: [ 3.210254] md/raid:md0: device sdd3 operational as raid disk 3
May 16 04:08:28 saturn kernel: [ 3.211979] md/raid:md0: device sdc3 operational as raid disk 2
May 16 04:08:28 saturn kernel: [ 3.214179] md/raid:md0: allocated 5334kB
May 16 04:08:28 saturn kernel: [ 3.215917] md/raid:md0: cannot start dirty degraded array.
May 16 04:08:28 saturn kernel: [ 3.217880] md/raid:md0: failed to run raid set.
May 16 04:08:28 saturn kernel: [ 3.221377] dracut: mdadm: failed to RUN_ARRAY /dev/md0: Input/output error
May 16 04:08:28 saturn kernel: [ 3.425089] dracut: mdadm: /dev/md0 is already in use.
May 16 04:08:28 saturn kernel: [ 4.118667] dracut: mdadm: /dev/md0 is already in use.
May 17 00:58:12 saturn kernel: [ 3.006195] md: md0 stopped.
May 17 00:58:12 saturn kernel: [ 3.174154] md/raid:md0: not clean -- starting background reconstruction
May 17 00:58:12 saturn kernel: [ 3.175688] md/raid:md0: device sda3 operational as raid disk 0
May 17 00:58:12 saturn kernel: [ 3.177218] md/raid:md0: device sdb3 operational as raid disk 4
May 17 00:58:12 saturn kernel: [ 3.178717] md/raid:md0: device sdd3 operational as raid disk 3
May 17 00:58:12 saturn kernel: [ 3.180196] md/raid:md0: device sdc3 operational as raid disk 2
May 17 00:58:12 saturn kernel: [ 3.182161] md/raid:md0: allocated 5334kB
May 17 00:58:12 saturn kernel: [ 3.183976] md/raid:md0: cannot start dirty degraded array.
May 17 00:58:12 saturn kernel: [ 3.186002] md/raid:md0: failed to run raid set.
May 17 00:58:12 saturn kernel: [ 3.189615] dracut: mdadm: failed to RUN_ARRAY /dev/md0: Input/output error
May 17 00:58:12 saturn kernel: [ 3.540474] dracut: mdadm: /dev/md0 is already in use.
May 17 00:58:12 saturn kernel: [ 3.614348] dracut: mdadm: /dev/md0 is already in use.
#
# grep md0 /var/log/messages-20110515
[â]
May 12 03:05:12 saturn kernel: [132994.557873] md: delaying data-check of md0 until md1 has finished (they share one or more physical units)
May 12 03:24:41 saturn kernel: [134160.574564] md: data-check of RAID array md0
May 12 03:25:22 saturn kernel: [134202.299274] md: md0: data-check done.
May 13 00:15:00 saturn kernel: [ 3.046117] md: md0 stopped.
May 13 00:15:00 saturn kernel: [ 3.208950] md/raid:md0: device sda3 operational as raid disk 0
May 13 00:15:00 saturn kernel: [ 3.210743] md/raid:md0: device sdb3 operational as raid disk 4
May 13 00:15:00 saturn kernel: [ 3.212501] md/raid:md0: device sdd3 operational as raid disk 3
May 13 00:15:00 saturn kernel: [ 3.214246] md/raid:md0: device sdc3 operational as raid disk 2
May 13 00:15:00 saturn kernel: [ 3.215974] md/raid:md0: device sde3 operational as raid disk 1
May 13 00:15:00 saturn kernel: [ 3.218201] md/raid:md0: allocated 5334kB
May 13 00:15:00 saturn kernel: [ 3.219955] md/raid:md0: raid level 6 active with 5 out of 5 devices, algorithm 2
May 13 00:15:00 saturn kernel: [ 3.221442] md0: detected capacity change from 0 to 11009851392
May 13 00:15:00 saturn kernel: [ 3.223285] dracut: mdadm: /dev/md0 has been started with 5 drives.
May 13 00:15:00 saturn kernel: [ 3.223971] md0: unknown partition table
May 13 00:15:00 saturn kernel: [ 12.055465] Adding 10751804k swap on /dev/md0. Priority:-1 extents:1 across:10751804k
# date ; cat /proc/mdstat
Tue May 17 08:52:16 NZST 2011
Personalities : [raid6] [raid5] [raid4]
md2 : active raid6 sda4[0] sdc4[6] sdd4[3] sdb4[5] sde4[1]
1114745856 blocks super 1.1 level 6, 512k chunk, algorithm 2 [5/5] [UUUUU]
bitmap: 2/3 pages [8KB], 65536KB chunk
md1 : active raid6 sda2[0] sdc2[4] sdd2[3] sde2[2] sdb2[1]
307198464 blocks level 6, 512k chunk, algorithm 2 [5/5] [UUUUU]
md0 : inactive sda3[0] sdb3[4] sdd3[3] sdc3[2]
14335744 blocks
unused devices: <none>
# mdadm --detail /dev/md0
/dev/md0:
Version : 0.90
Creation Time : Thu Dec 3 13:05:42 2009
Raid Level : raid6
Used Dev Size : 3583936 (3.42 GiB 3.67 GB)
Raid Devices : 5
Total Devices : 4
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Mon May 16 03:56:48 2011
State : active, degraded, Not Started
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
UUID : 3b76ac20:8253f696:bfe78010:bc810f04
Events : 0.11171
Number Major Minor RaidDevice State
0 8 3 0 active sync /dev/sda3
1 0 0 1 removed
2 8 35 2 active sync /dev/sdc3
3 8 51 3 active sync /dev/sdd3
4 8 19 4 active sync /dev/sdb3
# mdadm --stop /dev/md0
mdadm: stopped /dev/md0
# date ; cat /proc/mdstat
Tue May 17 09:04:49 NZST 2011
Personalities : [raid6] [raid5] [raid4]
md2 : active raid6 sda4[0] sdc4[6] sdd4[3] sdb4[5] sde4[1]
1114745856 blocks super 1.1 level 6, 512k chunk, algorithm 2 [5/5] [UUUUU]
bitmap: 2/3 pages [8KB], 65536KB chunk
md1 : active raid6 sda2[0] sdc2[4] sdd2[3] sde2[2] sdb2[1]
307198464 blocks level 6, 512k chunk, algorithm 2 [5/5] [UUUUU]
unused devices: <none>
#
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