Re: journal disk become the first of --detail list after fail/remove one disk

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On 08/04/2016 07:34 AM, Adam Goryachev wrote:


On 4/08/2016 20:52, Yi Zhang wrote:
# mdadm -D /dev/md0
/dev/md0:
         Version : 1.2
   Creation Time : Thu Aug  4 18:42:19 2016
      Raid Level : raid4
      Array Size : 3139584 (2.99 GiB 3.21 GB)
   Used Dev Size : 523264 (511.00 MiB 535.82 MB)
    Raid Devices : 7
   Total Devices : 7
     Persistence : Superblock is persistent

   Intent Bitmap : Internal

     Update Time : Thu Aug  4 18:43:22 2016
           State : clean, degraded
  Active Devices : 6
Working Devices : 7
  Failed Devices : 0
   Spare Devices : 1

      Chunk Size : 512K

Name : dhcp-12-125.nay.redhat.com:0 (local to host dhcp-12-125.nay.redhat.com)
            UUID : 29a267c2:04e91998:639e6eef:64ddbab0
          Events : 23

     Number   Major   Minor   RaidDevice State
        7       7        0        -      journal   /dev/loop0
        1       7        2        1      active sync /dev/loop2
        2       7        3        2      active sync /dev/loop3
        3       7        4        3      active sync /dev/loop4
        4       7        5        4      active sync /dev/loop5
        5       7        6        5      active sync /dev/loop6
        8       7        7        6      active sync /dev/loop7


I'm not really sure about the journal/your report, but also why does the above show 1 spare device? I would expect spare should mean that there is a device available to take over automatically if one of the active devices becomes faulty, but that doesn't seem to be the case. Should a journal device be counted as Active & Working (or faulty) instead of Spare?

Agree, or maybe "Journal Devices" can be added for it (but both kernel and mdadm need to modify md_u.h I think).

Regards,
Guoqing
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