Public bug reported:
Binary package hint: mdadm
Rebuild degraded RAID1 or RAID5 no problem, rebuild degraded RAID10
fails.
Here is basic problem, one drive fails leaving RAID10 array and
clean/degraded. Add hot spare. Drive shows up as hot spare yet auto-
rebuild does not start. Only occurs with RAID10 array. I try removing
the spare drive, delete its super block, and then re-add it, stll fails.
Do the same thing with RAID1/RAID5 and auto-rebuild starts on its own.
This is using Ubuntu 8.10 and mdadm 2.6.7-3ubuntu7.
Here is example:
[EMAIL PROTECTED]:~/bin$ sudo mdadm /dev/md4 --remove /dev/sdb4
mdadm: hot removed /dev/sdb4
[EMAIL PROTECTED]:~/bin$ sudo mdadm --zero-superblock /dev/sdb4
[EMAIL PROTECTED]:~/bin$ sudo mdadm /dev/md4 --add /dev/sdb4
mdadm: added /dev/sdb4
[EMAIL PROTECTED]:~/bin$ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4]
[raid10]
md2 : active raid0 sdb2[0] sdd2[2] sdc2[1]
733767168 blocks 512k chunks
md3 : active raid5 sdb3[0] sdc3[1] sdd3[6] sdh3[5] sdg3[4] sdf3[3] sde3[2]
4300824576 blocks level 5, 512k chunk, algorithm 2 [7/7] [UUUUUUU]
md4 : active raid10 sdb4[7](S) sdc4[1] sdh4[6] sdg4[5] sdf4[4] sde4[3] sdd4[2]
53781280 blocks 32K chunks 2 near-copies [7/6] [_UUUUUU]
unused devices: <none>
[EMAIL PROTECTED]:~/bin$
Here is array --detail
/dev/md4:
Version : 00.90
Creation Time : Mon Oct 13 02:01:54 2008
Raid Level : raid10
Array Size : 53781280 (51.29 GiB 55.07 GB)
Used Dev Size : 15366080 (14.65 GiB 15.73 GB)
Raid Devices : 7
Total Devices : 7
Preferred Minor : 4
Persistence : Superblock is persistent
Update Time : Thu Oct 16 11:52:39 2008
State : clean, degraded
Active Devices : 6
Working Devices : 7
Failed Devices : 0
Spare Devices : 1
Layout : near=2, far=1
Chunk Size : 32K
UUID : c16f9559:800b499b:18ceddb4:39b7cf2e (local to host nine)
Events : 0.32
Number Major Minor RaidDevice State
0 0 0 0 removed
1 8 36 1 active sync /dev/sdc4
2 8 52 2 active sync /dev/sdd4
3 8 68 3 active sync /dev/sde4
4 8 84 4 active sync /dev/sdf4
5 8 100 5 active sync /dev/sdg4
6 8 116 6 active sync /dev/sdh4
7 8 20 - spare /dev/sdb4
Here is another example of fail to rebuild RAID10 and then success in
rebuilting as RAID1:
[EMAIL PROTECTED]:~# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4]
[raid10]
md9 : active raid10 loop4[3] loop3[2] loop2[1] loop1[0]
40832 blocks 64K chunks 2 near-copies [4/4] [UUUU]
unused devices: <none>
[EMAIL PROTECTED]:~# mdadm /dev/md9 -f /dev/loop3
mdadm: set /dev/loop3 faulty in /dev/md9
[EMAIL PROTECTED]:~# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4]
[raid10]
md9 : active raid10 loop4[3] loop3[4](F) loop2[1] loop1[0]
40832 blocks 64K chunks 2 near-copies [4/3] [UU_U]
[EMAIL PROTECTED]:~# mdadm /dev/md9 --remove /dev/loop3
mdadm: hot removed /dev/loop3
[EMAIL PROTECTED]:~# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4]
[raid10]
md9 : active raid10 loop4[3] loop2[1] loop1[0]
40832 blocks 64K chunks 2 near-copies [4/3] [UU_U]
[EMAIL PROTECTED]:~# mdadm --zero-superblock /dev/loop3
[EMAIL PROTECTED]:~# mdadm /dev/md9 --add /dev/loop3
mdadm: added /dev/loop3
[EMAIL PROTECTED]:~# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4]
[raid10]
md9 : active raid10 loop3[4](S) loop4[3] loop2[1] loop1[0]
40832 blocks 64K chunks 2 near-copies [4/3] [UU_U]
[EMAIL PROTECTED]:~#
[EMAIL PROTECTED]:~# mdadm -S /dev/md9
mdadm: stopped /dev/md9
[EMAIL PROTECTED]:~# mdadm --zero-superblock /dev/loop1
[EMAIL PROTECTED]:~# mdadm --zero-superblock /dev/loop2
[EMAIL PROTECTED]:~# mdadm --zero-superblock /dev/loop3
[EMAIL PROTECTED]:~# mdadm --zero-superblock /dev/loop4
[EMAIL PROTECTED]:~# mdadm -C --level=raid1 -n 4 /dev/md9 /dev/loop1 /dev/loop2
/dev/loop3 /dev/loop4
mdadm: array /dev/md9 started.
[EMAIL PROTECTED]:~# cat /proc/mdstat
md9 : active raid1 loop4[3] loop3[2] loop2[1] loop1[0]
20416 blocks [4/4] [UUUU]
[EMAIL PROTECTED]:~# mdadm /dev/md9 -f /dev/loop3
mdadm: set /dev/loop3 faulty in /dev/md9
[EMAIL PROTECTED]:~# mdadm /dev/md9 --remove /dev/loop3
mdadm: hot removed /dev/loop3
[EMAIL PROTECTED]:~# mdadm /dev/md9 --zero-superblock /dev/loop3
[EMAIL PROTECTED]:~# mdadm /dev/md9 --add /dev/loop3
mdadm: added /dev/loop3
[EMAIL PROTECTED]:~# cat /proc/mdstat
md9 : active raid1 loop3[2] loop4[3] loop2[1] loop1[0]
20416 blocks [4/4] [UUUU]
** Affects: mdadm (Ubuntu)
Importance: Undecided
Status: New
--
mdadm RAID10 arrays cannot be rebuilt, will not use available spare drives
https://bugs.launchpad.net/bugs/285156
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