The following confuses me:
[root@mrak ~]# mdadm --examine --scan
ARRAY /dev/md/0 metadata=1.2 UUID=d3f800db:26de8691:dc0caf45:0f75028b name=mrak.dex.internal:0
ARRAY /dev/md/0 metadata=1.2 UUID=1870fd84:2234e3d4:580f7634:b0b621e7 name=mrak.dex.internal:0
This array is RAID10 comprising 4 Seagate Momentus XT 750GB disks. The active RAID's UUID is d3f800db:26de8691:dc0caf45:0f75028b. Can someone explain to me why am I getting the second ARRAY line?
Also, why I do not see /dev/sdb1, /dev/sde1 and /dev/sde1? Those are all partitions used to build the array, that are of type "Linux raid autodetect".
If I get details for /dev/md/0 I get:
[root@mrak ~]# mdadm --detail /dev/md/0
/dev/md/0:
Version : 1.2
Creation Time : Fri Feb 8 12:47:03 2013
Raid Level : raid10
Array Size : 1464886528 (1397.02 GiB 1500.04 GB)
Used Dev Size : 732443264 (698.51 GiB 750.02 GB)
Raid Devices : 4
Total Devices : 4
Persistence : Superblock is persistent
Update Time : Wed Feb 13 09:20:54 2013
State : clean, degraded, recovering
Active Devices : 3
Working Devices : 4
Failed Devices : 0
Spare Devices : 1
Layout : near=2
Chunk Size : 128K
Rebuild Status : 14% complete
Name : mrak.dex.internal:0 (local to host mrak.dex.internal)
UUID : d3f800db:26de8691:dc0caf45:0f75028b
Events : 151
Number Major Minor RaidDevice State
0 8 16 0 active sync /dev/sdb
1 8 64 1 active sync /dev/sde
2 8 48 2 active sync /dev/sdd
4 8 33 3 spare rebuilding /dev/sdc1
