mount

mount

# mdadm --assemble /dev/md1 /dev/sde1
mdadm: /dev/md1 assembled from 1 drive - need all 2 to start it (use --run to insist).
# ls -l /dev/md1
brw-rw---T 1 root disk 9, 1 12月 14 06:49 /dev/md1
# mdadm --run /dev/md1
mdadm: started /dev/md1
# mount -o ro /dev/md1 /mnt

umount

umount

# umount /mnt
# sudo mdadm --stop /dev/md1

その他確認方法

ファイルシステムがLinuxRaidAutodetectであることを確認。

# fdisk -l /dev/sde
Disk /dev/sde: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0001d3aa

   Device Boot      Start         End      Blocks   Id  System
/dev/sde1            2048   976771071   488384512   fd  Linux raid autodetect

認識したか確認(md1)

# cat /proc/mdstat 
Personalities : [raid1] 
md1 : active raid1 sde1[0]
      488253248 blocks super 1.2 [2/1] [U_]
      
md0 : active raid1 sdb1[0] sdc1[1]
      976630336 blocks super 1.2 [2/2] [UU]
      
unused devices: <none>

HDDが片方しかない場合の表示

# mdadm -D /dev/md1
/dev/md1:
        Version : 1.2
  Creation Time : Wed Aug  7 20:15:15 2013
     Raid Level : raid1
     Array Size : 488253248 (465.63 GiB 499.97 GB)
  Used Dev Size : 488253248 (465.63 GiB 499.97 GB)
   Raid Devices : 2
  Total Devices : 1
    Persistence : Superblock is persistent

    Update Time : Sat Dec 14 06:59:51 2013
          State : clean, degraded
 Active Devices : 1
Working Devices : 1
 Failed Devices : 0
  Spare Devices : 0

           Name : server2:0
           UUID : 2b74a108:2cc695cd:3a89d850:27a782fb
         Events : 172

    Number   Major   Minor   RaidDevice State
       0       8       65        0      active sync   /dev/sde1
       1       0        0        1      removed

HDDが2つある時の表示

# mdadm -D /dev/md0
/dev/md0:
        Version : 1.2
  Creation Time : Sat Oct  5 05:10:37 2013
     Raid Level : raid1
     Array Size : 976630336 (931.39 GiB 1000.07 GB)
  Used Dev Size : 976630336 (931.39 GiB 1000.07 GB)
   Raid Devices : 2
  Total Devices : 2
    Persistence : Superblock is persistent

    Update Time : Sat Dec 14 07:00:47 2013
          State : active
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           Name : take:0
           UUID : 085f26a1:5a98bf98:27fb0e99:3d06d852
         Events : 101

    Number   Major   Minor   RaidDevice State
       0       8       17        0      active sync   /dev/sdb1
       1       8       33        1      active sync   /dev/sdc1