[Bug 1543003] Re: Mdadm –detail command is not displaying the state of a degraded md array as degraded

Tue Feb 16 05:36:52 UTC 2016

I have observed that:
If md array is created with partitioned disk, the state change with array degrade is working as expected.
Verified with kernel 4.2.0-23-generic

1. Create md array with partitioned disk
# mdadm --detail /dev/md500
/dev/md500:
Version : 1.2
Creation Time : Mon Feb 15 16:17:59 2016
Raid Level : raid1
Array Size : 11709312 (11.17 GiB 11.99 GB)
Used Dev Size : 11709312 (11.17 GiB 11.99 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent

Update Time : Mon Feb 15 16:19:55 2016
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0

Name : blrfsserv149:500 (local to host blrfsserv149)
UUID : d76dbca0:5ff06b36:8057cfde:96d9475b
Events : 17

Number Major Minor RaidDevice State
0 8 81 0 active sync /dev/sdf1
1 8 97 1 active sync /dev/sdg1

2. Offline the scsi device using scsi command
# lsscsi | grep sdf
[0:2:5:0] disk DELL PERC H730 Mini 4.25 /dev/sdf

# echo 1 > /sys/bus/scsi/devices/0:2:5:0/delete
# lsscsi | grep sdf

3. Check the details of md array, the state is changed from clean to clean,degraded
# mdadm --detail /dev/md500
/dev/md500:
Version : 1.2
Creation Time : Mon Feb 15 16:17:59 2016
Raid Level : raid1
Array Size : 11709312 (11.17 GiB 11.99 GB)
Used Dev Size : 11709312 (11.17 GiB 11.99 GB)
Raid Devices : 2
Total Devices : 1
Persistence : Superblock is persistent

Update Time : Mon Feb 15 16:21:02 2016
State : clean, degraded
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0

Name : blrfsserv149:500 (local to host blrfsserv149)
UUID : d76dbca0:5ff06b36:8057cfde:96d9475b
Events : 20

Number Major Minor RaidDevice State
0 0 0 0 removed
1 8 97 1 active sync /dev/sdg1

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Title:
  Mdadm –detail command is not displaying the state of a degraded md
  array as degraded

Status in mdadm package in Ubuntu:
  New

Bug description:
  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

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