mdadm Linux Software RAID auto-detect and assemble RAID Array
mdadm --assemble --scan
mdadm: /dev/md/diaghost05102010:2 has been started with 2 drives.
mdadm: /dev/md/diaghost05102010:1 has been started with 2 drives.
mdadm: /dev/md/diaghost05102010:0 has been started with 2 drives.
-bash-3.1# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid6] [raid5] [raid4] [multipath]
md125 : active raid1 sda1[0] sdb1[1]
14658185 blocks super 1.2 [2/2] [UU]
md126 : active raid1 sda2[0] sdb2[1]
58604024 blocks super 1.2 [2/2] [UU]
md127 : active raid1 sda3[0] sdb3[1]
1880246440 blocks super 1.2 [2/2] [UU]
[>....................] resync = 0.0% (1228928/1880246440) finish=407.7min speed=76808K/sec
unused devices: <none>
The only strange thing is that the drives were all renamed to something high, md125,126 and 127 when I originally created them as 0,1,2
What if you don't want to assemble the array?
You can just scan like this
mdadm -D -s
ARRAY /dev/md/diaghost05102010:2 metadata=1.2 name=diaghost05102010:2 UUID=d851091d:3d109a17:921ab0e1:3a465899
ARRAY /dev/md/diaghost05102010:1 metadata=1.2 name=diaghost05102010:1 UUID=f841529d:a434b994:6f27c55b:64f4ef7d
ARRAY /dev/md/diaghost05102010:0 metadata=1.2 name=diaghost05102010:0 UUID=cba74a1f:e1c83abe:1ea30dc3:cee425bd
To see the details of a specific array just do this:
mdadm -D /dev/md/diaghost05102010:2
/dev/md/diaghost05102010:2:
Version : 1.2
Creation Time : Mon May 10 22:05:48 2010
Raid Level : raid1
Array Size : 1880246440 (1793.14 GiB 1925.37 GB)
Used Dev Size : 1880246440 (1793.14 GiB 1925.37 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Wed May 12 23:37:54 2010
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Name : diaghost05102010:2
UUID : d851091d:3d109a17:921ab0e1:3a465899
Events : 6
Number Major Minor RaidDevice State
0 8 3 0 active sync /dev/sda3
1 8 19 1 active sync /dev/sdb3
Tags:
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