Hi!
I set up a RAID5 array of 4 disks. I initially created a degraded array
and added the fourth disk (sda1) later.
The array is "clean", but when I do
mdadm -S /dev/md0
mdadm --assemble /dev/md0 /dev/sd[abcd]1
it won't start. It always says sda1 is "failed".
When I remove sda1 and add it again everything seems to be fine until I
stop the array.
Below is the output of /proc/mdstat, mdadm -D -Q, mdadm -E and a piece of the
kernel log.
The output of mdadm -E looks strange for /dev/sd[bcd]1, saying "1 failed".
What can I do about this?
How could this happen? I mixed up the syntax when adding the fourth disk and
tried these two commands (at least one didn't yield an error message):
mdadm --manage -a /dev/md0 /dev/sda1
mdadm --manage -a /dev/sda1 /dev/md0
Thanks in advance ...
Roni
ganges:~# cat /proc/mdstat
Personalities : [raid5] [raid4]
md0 : active raid5 sda1[4] sdc1[0] sdb1[2] sdd1[1]
691404864 blocks super 1.0 level 5, 64k chunk, algorithm 2 [4/4] [UUUU]
unused devices: <none>
ganges:~# mdadm -Q -D /dev/md0
/dev/md0:
Version : 01.00.03
Creation Time : Wed Jun 21 13:00:41 2006
Raid Level : raid5
Array Size : 691404864 (659.38 GiB 708.00 GB)
Device Size : 460936576 (219.79 GiB 236.00 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Fri Jun 23 15:54:23 2006
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
Name : 0
UUID : f937e8c2:15b41d19:fe79ccca:2614b165
Events : 32429
Number Major Minor RaidDevice State
0 8 33 0 active sync /dev/sdc1
1 8 49 1 active sync /dev/sdd1
2 8 17 2 active sync /dev/sdb1
4 8 1 3 active sync /dev/sda1
ganges:~# mdadm -E /dev/sd[abcd]1
/dev/sda1:
Magic : a92b4efc
Version : 01
Feature Map : 0x0
Array UUID : f937e8c2:15b41d19:fe79ccca:2614b165
Name : 0
Creation Time : Wed Jun 21 13:00:41 2006
Raid Level : raid5
Raid Devices : 4
Device Size : 460936832 (219.79 GiB 236.00 GB)
Array Size : 1382809728 (659.38 GiB 708.00 GB)
Used Size : 460936576 (219.79 GiB 236.00 GB)
Super Offset : 460936960 sectors
State : active
Device UUID : f41dfb24:72cc87b7:4003ad32:bc19c70c
Update Time : Fri Jun 23 15:54:23 2006
Checksum : ad466c73 - correct
Events : 32429
Layout : left-symmetric
Chunk Size : 64K
Array State : uuuu 1 failed
/dev/sdb1:
Magic : a92b4efc
Version : 01
Feature Map : 0x0
Array UUID : f937e8c2:15b41d19:fe79ccca:2614b165
Name : 0
Creation Time : Wed Jun 21 13:00:41 2006
Raid Level : raid5
Raid Devices : 4
Device Size : 460936832 (219.79 GiB 236.00 GB)
Array Size : 1382809728 (659.38 GiB 708.00 GB)
Used Size : 460936576 (219.79 GiB 236.00 GB)
Super Offset : 460936960 sectors
State : active
Device UUID : 6283effa:df4cb959:d449e09e:4eb0a65b
Update Time : Fri Jun 23 15:54:23 2006
Checksum : e07f2f74 - correct
Events : 32429
Layout : left-symmetric
Chunk Size : 64K
Array State : uuUu 1 failed
/dev/sdc1:
Magic : a92b4efc
Version : 01
Feature Map : 0x0
Array UUID : f937e8c2:15b41d19:fe79ccca:2614b165
Name : 0
Creation Time : Wed Jun 21 13:00:41 2006
Raid Level : raid5
Raid Devices : 4
Device Size : 460936768 (219.79 GiB 236.00 GB)
Array Size : 1382809728 (659.38 GiB 708.00 GB)
Used Size : 460936576 (219.79 GiB 236.00 GB)
Super Offset : 460936896 sectors
State : active
Device UUID : 4f581aed:e24b4ac2:3d2ca149:191c89c1
Update Time : Fri Jun 23 15:54:23 2006
Checksum : 4bde5117 - correct
Events : 32429
Layout : left-symmetric
Chunk Size : 64K
Array State : Uuuu 1 failed
/dev/sdd1:
Magic : a92b4efc
Version : 01
Feature Map : 0x0
Array UUID : f937e8c2:15b41d19:fe79ccca:2614b165
Name : 0
Creation Time : Wed Jun 21 13:00:41 2006
Raid Level : raid5
Raid Devices : 4
Device Size : 460936832 (219.79 GiB 236.00 GB)
Array Size : 1382809728 (659.38 GiB 708.00 GB)
Used Size : 460936576 (219.79 GiB 236.00 GB)
Super Offset : 460936960 sectors
State : active
Device UUID : b5fc3eba:07da8be3:81646894:e3c313dc
Update Time : Fri Jun 23 15:54:23 2006
Checksum : 9f966431 - correct
Events : 32429
Layout : left-symmetric
Chunk Size : 64K
Array State : uUuu 1 failed
[ 174.318555] md: md0 stopped.
[ 174.400617] md: bind<sdd1>
[ 174.401850] md: bind<sdb1>
[ 174.403068] md: bind<sda1>
[ 174.404321] md: bind<sdc1>
[ 174.442943] raid5: measuring checksumming speed
[ 174.463185] 8regs : 543.000 MB/sec
[ 174.483171] 8regs_prefetch: 431.000 MB/sec
[ 174.503162] 32regs : 335.000 MB/sec
[ 174.523152] 32regs_prefetch: 293.000 MB/sec
[ 174.543144] pII_mmx : 938.000 MB/sec
[ 174.563138] p5_mmx : 901.000 MB/sec
[ 174.563466] raid5: using function: pII_mmx (938.000 MB/sec)
[ 174.578432] md: raid5 personality registered for level 5
[ 174.578808] md: raid4 personality registered for level 4
[ 174.580416] raid5: device sdc1 operational as raid disk 0
[ 174.580773] raid5: device sdb1 operational as raid disk 2
[ 174.581118] raid5: device sdd1 operational as raid disk 1
[ 174.584893] raid5: allocated 4196kB for md0
[ 174.585242] raid5: raid level 5 set md0 active with 3 out of 4 devices, algorithm 2
[ 174.585805] RAID5 conf printout:
[ 174.586108] --- rd:4 wd:3 fd:1
[ 174.586411] disk 0, o:1, dev:sdc1
[ 174.586718] disk 1, o:1, dev:sdd1
[ 174.587019] disk 2, o:1, dev:sdb1
[ 219.660549] md: unbind<sda1>
[ 219.660921] md: export_rdev(sda1)
[ 227.126828] md: bind<sda1>
[ 227.127242] RAID5 conf printout:
[ 227.127538] --- rd:4 wd:3 fd:1
[ 227.127829] disk 0, o:1, dev:sdc1
[ 227.128132] disk 1, o:1, dev:sdd1
[ 227.128428] disk 2, o:1, dev:sdb1
[ 227.128721] disk 3, o:1, dev:sda1
[ 227.129163] md: syncing RAID array md0
[ 227.129478] md: minimum _guaranteed_ reconstruction speed: 1000 KB/sec/disc.
[ 227.129892] md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for reconstruction.
[ 227.130499] md: using 128k window, over a total of 230468288 blocks.
[16359.493868] md: md0: sync done.
[16359.499961] RAID5 conf printout:
[16359.500213] --- rd:4 wd:4 fd:0
[16359.500453] disk 0, o:1, dev:sdc1
[16359.500714] disk 1, o:1, dev:sdd1
[16359.500958] disk 2, o:1, dev:sdb1
[16359.501202] disk 3, o:1, dev:sda1
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