raid0 can’t be stopped when unplug a member disk

Issue

• The array still exists after removing one of the drive from existing RAID0
  • Here is the dmesg command output.

[  129.225349] sd 1:0:0:0: [sdb] Synchronizing SCSI cache
[  129.238536] md: md127: raid0 array has a missing/failed member
[  129.238633] Buffer I/O error on dev md127, logical block 0, async page read
[  129.268439] Buffer I/O error on dev md127, logical block 0, async page read

• The /proc/mdstat output for raid0 still exist even one of the member is missing.

$ cat /proc/mdstat 
Personalities : [raid0] 
md127 : active (auto-read-only) raid0 sdc[1] sdb[0]      <<<----
      10475520 blocks super 1.2 512k chunks
unused devices: <none>

$ mdadm -D /dev/md127 
/dev/md127:
        Raid Level : raid0
             State : read-auto, FAILED 


    Number   Major   Minor   RaidDevice State
       0       8       16        0      active sync   missing      <<<--------
       1       8       32        1      active sync   /dev/sdc