First off, Merry Christmas everyone! :)
Secondly, given a device that is part of an array, is there a way to figure out
all the other components if you are using the 1.2 superblock?
With SB=0.90, you could issue a "--examine" and it would report all the other
devices (in the following example, that would be /dev/sata[1-4]). However, with
SB=1.2 (included below) you aren't so lucky. :)
Cheers,
don
0) Using 0.90 superblock
mdadm --create /dev/md0 -e0.90 --level=5 --raid-devices=4 /dev/sata[1-4] ...
mdadm --examine /dev/sata1
...
snip
....
Number Major Minor RaidDevice State
this 0 8 32 0 active sync /dev/sata1
0 0 8 32 0 active sync /dev/sata1
1 1 8 0 1 active sync /dev/sata2
2 2 8 16 2 active sync /dev/sata3
3 3 0 0 3 faulty
4 4 8 48 4 spare /dev/sata4
1) Using 1.2 superblock
mdadm --create /dev/md0 -e1.2 --level=5 --raid-devices=4 /dev/sata[1-4] mdadm --examine /dev/sata1
/dev/sata1:
Magic : a92b4efc
Version : 01
Feature Map : 0x0
Array UUID : efe9708d:c0fd30c2:53f83f15:ad0ac1bc
Name : 0
Creation Time : Fri Dec 22 19:54:27 2006
Raid Level : raid5
Raid Devices : 4
Device Size : 17882270235826847744 (5581842.00 TiB 6137300.18 T
Array Size : 482508672 (230.08 GiB 247.04 GB)
Used Size : 160836224 (76.69 GiB 82.35 GB)
Data Offset : 136 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 49891598:1b3fa1af:8f8da6d6:6bcf4eff
Update Time : Fri Dec 22 19:54:27 2006
Checksum : 85bf273c - correct
Events : 0
Layout : left-symmetric
Chunk Size : 64K
Array Slot : 0 (0, 1, 2, 65279)
Array State : Uuu_
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