Intel RST(온보드 RAID)에 핫 스페어 디스크 추가

3개의 디스크(RAID5)를 사용하고 있으며 예비 디스크(dev/sdd)를 추가하고 싶습니다. 시스템은 Intel RST(온보드 RAID)를 사용하며 CentOS7 및 mdadm 명령으로 인식됩니다. 하지만 여러 가지 방법을 시도했지만 예비 디스크를 "핫 스페어 디스크"로 추가할 수 없습니다.

[root@ehost ~]# mdadm --detail /dev/md/imsm0
/dev/md/imsm0:
      Version : imsm
   Raid Level : container
Total Devices : 3
Working Devices : 3
       UUID : 750b9700:31df2732:350d713c:10b17437
Member Arrays : /dev/md/Volume1
Number   Major   Minor   RaidDevice
   0       8        0        -        /dev/sda
   1       8       16        -        /dev/sdb
   2       8       32        -        /dev/sdc

[root@ehost ~]# mdadm --detail /dev/md126
/dev/md126:
  Container : /dev/md/imsm0, member 0
 Raid Level : raid5
 Array Size : 1953519616 (1863.02 GiB 2000.40 GB)
 Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
  Raid Devices : 3
 Total Devices : 3
         State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 0
 Spare Devices : 0

     Layout : left-asymmetric
 Chunk Size : 128K
       UUID : d984583f:721b097a:b725e6c2:55b874f4
Number   Major   Minor   RaidDevice State
   2       8        0        0      active sync   /dev/sda
   1       8       16        1      active sync   /dev/sdb
   0       8       32        2      active sync   /dev/sdc

[root@ehost ~]# mdadm --add /dev/md126 /dev/sdd
mdadm: Cannot add disks to a 'member' array, perform this operation on the parent container

[root@ehost ~]# mdadm --add /dev/md/imsm0 /dev/sdd
mdadm: added /dev/sdd

[root@ehost ~]# mdadm --detail /dev/md/imsm0
/dev/md/imsm0:
    Version : imsm
 Raid Level : container
 Total Devices : 4
Working Devices : 4
       UUID : 750b9700:31df2732:350d713c:10b17437
 Member Arrays : /dev/md/Volume1
Number   Major   Minor   RaidDevice

   0       8        0        -        /dev/sda
   1       8       16        -        /dev/sdb
   2       8       32        -        /dev/sdc
   3       8       48        -        /dev/sdd

[root@ehost ~]# mdadm --detail /dev/md126
/dev/md126:
  Container : /dev/md/imsm0, member 0
 Raid Level : raid5
 Array Size : 1953519616 (1863.02 GiB 2000.40 GB)
  Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
   Raid Devices : 3
     Total Devices : 3

      State : clean
 Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
     Layout : left-asymmetric
 Chunk Size : 128K
       UUID : d984583f:721b097a:b725e6c2:55b874f4
Number   Major   Minor   RaidDevice State
   2       8        0        0      active sync   /dev/sda
   1       8       16        1      active sync   /dev/sdb
   0       8       32        2      active sync   /dev/sdc
[root@ehost ~]#

도와주세요, 감사합니다! 에드윈