mdadm：…热删除失败

Question

我的RAID1已经降级，我需要替换/dev/sdb。但是，我可以将/dev/sdb1 5(在/dev/md1中)标记为“失败”，并将其删除，但不能对/dev/sdb1 1 (/dev/md0 )执行相同的操作，而/dev/md0是在/上挂载的：

root@kes:~# mdadm /dev/md0 --fail /dev/sdb1
mdadm: set /dev/sdb1 faulty in /dev/md0

root@kes:~# mdadm --detail /dev/md0
/dev/md0:
        Version : 00.90
  Creation Time : Wed Apr  7 03:00:39 2010
     Raid Level : raid1
     Array Size : 975185536 (930.01 GiB 998.59 GB)
  Used Dev Size : 975185536 (930.01 GiB 998.59 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Mon Feb 13 12:27:41 2012
          State : active, degraded
 Active Devices : 1
Working Devices : 1
 Failed Devices : 1
  Spare Devices : 0

           UUID : cdc01e79:774eba08:ade2cb46:d0df0469 (local to host kes)
         Events : 0.67569047

    Number   Major   Minor   RaidDevice State
       0       8        1        0      active sync   /dev/sda1
       2       8       17        1      faulty spare rebuilding   /dev/sdb1

root@kes:~# mdadm /dev/md0 --remove /dev/sdb1
mdadm: hot remove failed for /dev/sdb1: Device or resource busy

那我做错什么了？

Answer 1

尝试：

echo "idle" > /sys/block/md0/md/sync_action
mdadm /dev/md0 --remove /dev/sdb1

为我工作过。