Public bug reported:
The problem is :
Mdadm –detail command is not displaying the state of an md array as degraded,
when actually the array is in degraded state:
Expected behavious is State should be 'Clean,degraded' for a degraded md array.
OS : Ubuntu 14.04.3 LTS
Kernel : 4.2.0-23-generic
mdadm v. 3.2.5-5
1. Create a md array
# mdadm --create /dev/md500 -n2 -l1
/dev/disk/by-id/scsi-3644a84203ba22f001d6f5278428ed6e6
/dev/disk/by-id/scsi-3644a84203ba22f001d6f527d42d5713d
mdadm: Note: this array has metadata at the start and
may not be suitable as a boot device. If you plan to
store '/boot' on this device please ensure that
your boot-loader understands md/v1.x metadata, or use
--metadata=0.90
Continue creating array? y
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md500 started.
# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4]
[raid10]
md500 : active raid1 sdc[1] sdb[0]
20955008 blocks super 1.2 [2/2] [UU]
unused devices: <none>
# mdadm --detail /dev/md500
/dev/md500:
Version : 1.2
Creation Time : Mon Feb 1 11:14:34 2016
Raid Level : raid1
Array Size : 20955008 (19.98 GiB 21.46 GB)
Used Dev Size : 20955008 (19.98 GiB 21.46 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Mon Feb 1 11:16:19 2016
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Name : blrfsserv149:500 (local to host blrfsserv149)
UUID : ff415711:f14f374c:b61831d4:0558303e
Events : 17
Number Major Minor RaidDevice State
0 8 16 0 active sync /dev/sdb
1 8 32 1 active sync /dev/sdc
2. Offline a device using scsi offline command
# echo 1 > /sys/bus/scsi/devices/0:2:1:0/delete
3. Check the mdadm --details, the state is still 'clean'
Expected behavious is State should be 'Clean,degraded'
# mdadm --detail /dev/md400
/dev/md400:
Version : 1.2
Creation Time : Mon Feb 1 17:36:08 2016
Raid Level : raid1
Array Size : 20955008 (19.98 GiB 21.46 GB)
Used Dev Size : 20955008 (19.98 GiB 21.46 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Mon Feb 1 17:46:05 2016
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Name : blrfsserv149:400 (local to host blrfsserv149)
UUID : 00728830:7dd439a9:e1abe1bf:d8ab91b5
Events : 2
Number Major Minor RaidDevice State
0 8 16 0 active sync
1 8 32 1 active sync /dev/sdc
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1543003
Title:
Mdadm –detail command is not displaying the state of a degraded md
array as degraded
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