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