Hello,
Summary:
After removing a disk via "want_replacement", disk count in /proc/mdstat is
wrong ("[5/4]", not "[5/5]" as it should be).
More details below:
----
# mdadm --add /dev/md0 /dev/sdb1
mdadm: added /dev/sdb1
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Wed May 25 00:07:38 2011
Raid Level : raid5
Array Size : 3907003136 (3726.01 GiB 4000.77 GB)
Used Dev Size : 976750784 (931.50 GiB 1000.19 GB)
Raid Devices : 5
Total Devices : 6
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Tue Sep 18 01:01:38 2012
State : active
Active Devices : 5
Working Devices : 6
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 64K
Name : avdeb:0 (local to host avdeb)
UUID : b99961fb:ed1f76c8:ec2dad31:6db45332
Events : 14135
Number Major Minor RaidDevice State
0 8 65 0 active sync /dev/sde1
6 8 33 1 active sync /dev/sdc1
3 8 81 2 active sync /dev/sdf1
4 8 49 3 active sync /dev/sdd1
5 8 97 4 active sync /dev/sdg1
7 8 17 - spare /dev/sdb1
# echo want_replacement > /sys/block/md0/md/dev-sde1/state
// It's rebuilding:
# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sdb1[7](R) sde1[0] sdg1[5] sdd1[4] sdf1[3] sdc1[6]
3907003136 blocks super 1.2 level 5, 64k chunk, algorithm 2 [5/5] [UUUUU]
[>....................] recovery = 0.1% (1724936/976750784) finish=150.7min speed=107808K/sec
bitmap: 0/4 pages [0KB], 131072KB chunk
// Rebuild finished:
# cat /proc/mdstat
md0 : active raid5 sdb1[7] sde1[0](F) sdg1[5] sdd1[4] sdf1[3] sdc1[6]
3907003136 blocks super 1.2 level 5, 64k chunk, algorithm 2 [5/4] [UUUUU]
bitmap: 0/4 pages [0KB], 131072KB chunk
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Wed May 25 00:07:38 2011
Raid Level : raid5
Array Size : 3907003136 (3726.01 GiB 4000.77 GB)
Used Dev Size : 976750784 (931.50 GiB 1000.19 GB)
Raid Devices : 5
Total Devices : 6
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Tue Sep 18 04:46:14 2012
State : active
Active Devices : 5
Working Devices : 5
Failed Devices : 1
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
Name : avdeb:0 (local to host avdeb)
UUID : b99961fb:ed1f76c8:ec2dad31:6db45332
Events : 14231
Number Major Minor RaidDevice State
7 8 17 0 active sync /dev/sdb1
6 8 33 1 active sync /dev/sdc1
3 8 81 2 active sync /dev/sdf1
4 8 49 3 active sync /dev/sdd1
5 8 97 4 active sync /dev/sdg1
0 8 65 - faulty spare /dev/sde1
// Removing sde1:
# mdadm --remove /dev/md0 /dev/sde1
mdadm: hot removed /dev/sde1 from /dev/md0
// Removed ok:
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Wed May 25 00:07:38 2011
Raid Level : raid5
Array Size : 3907003136 (3726.01 GiB 4000.77 GB)
Used Dev Size : 976750784 (931.50 GiB 1000.19 GB)
Raid Devices : 5
Total Devices : 5
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Tue Sep 18 08:49:24 2012
State : active
Active Devices : 5
Working Devices : 5
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
Name : avdeb:0 (local to host avdeb)
UUID : b99961fb:ed1f76c8:ec2dad31:6db45332
Events : 14234
Number Major Minor RaidDevice State
7 8 17 0 active sync /dev/sdb1
6 8 33 1 active sync /dev/sdc1
3 8 81 2 active sync /dev/sdf1
4 8 49 3 active sync /dev/sdd1
5 8 97 4 active sync /dev/sdg1
// In the end /proc/mdstat shows "[5/4]", not "[5/5]":
# cat /proc/mdstat
md0 : active raid5 sdb1[7] sdg1[5] sdd1[4] sdf1[3] sdc1[6]
3907003136 blocks super 1.2 level 5, 64k chunk, algorithm 2 [5/4] [UUUUU]
bitmap: 0/4 pages [0KB], 131072KB chunk
--
With respect,
Roman
~~~~~~~~~~~~~~~~~~~~~~~~~~~
"Stallman had a printer,
with code he could not see.
So he began to tinker,
and set the software free."
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