Hey everybody.
To keep it short, I have a RAID-5 mdraid, just today 2 out of the 5
drives dropped out. It was a cable issue and has since been fixed. The
array was not being written to or utilized in other way so no data has
been lost.
However when I attempted to reassemble the array with
mdadm --assemble --force --verbose /dev/md0 /dev/sdc /dev/sdd /dev/sde
/dev/sdf /dev/sdg
I got the folowing errors
mdadm: looking for devices for /dev/md0
mdadm: /dev/sdc is identified as a member of /dev/md0, slot 0.
mdadm: /dev/sdd is identified as a member of /dev/md0, slot 1.
mdadm: /dev/sde is identified as a member of /dev/md0, slot 2.
mdadm: /dev/sdf is identified as a member of /dev/md0, slot 3.
mdadm: /dev/sdg is identified as a member of /dev/md0, slot 4.
mdadm: ignoring /dev/sde as it reports /dev/sdc as failed
mdadm: ignoring /dev/sdf as it reports /dev/sdc as failed
mdadm: ignoring /dev/sdg as it reports /dev/sdc as failed
mdadm: added /dev/sdd to /dev/md0 as 1
mdadm: no uptodate device for slot 2 of /dev/md0
mdadm: no uptodate device for slot 3 of /dev/md0
mdadm: no uptodate device for slot 4 of /dev/md0
mdadm: added /dev/sdc to /dev/md0 as 0
mdadm: /dev/md0 assembled from 2 drives - not enough to start the array.
After doing --examine* I indeed found out that the StateArray info
inside the superblock has marked the first two drives as missing. That
is however not true anymore but I can't force it to assemble the array
or update the superblock info.
So is there anyway to force mdadm to assemble the array? Or perhaps
edit the superblock info manually? I'd rather avoid having to recreate
the array from scratch.
Any help or pointers with more info are highly appreciated. Thank you.
Regards,
Marek Jaros
*--examine output here:
/dev/sdc:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 43222604:a15a957d:313d7b6c:d087ba6a
Name : YSGARD:0
Creation Time : Thu Apr 25 12:38:17 2013
Raid Level : raid5
Raid Devices : 5
Avail Dev Size : 1953263024 (931.39 GiB 1000.07 GB)
Array Size : 3906525184 (3725.55 GiB 4000.28 GB)
Used Dev Size : 1953262592 (931.39 GiB 1000.07 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
State : clean
Device UUID : d2a4d8ed:b2c2bf12:6d553d16:7aabe804
Update Time : Sat Jul 6 14:43:14 2013
Checksum : 1b569235 - correct
Events : 2742
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 0
Array State : AAAAA ('A' == active, '.' == missing)
/dev/sdd:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 43222604:a15a957d:313d7b6c:d087ba6a
Name : YSGARD:0
Creation Time : Thu Apr 25 12:38:17 2013
Raid Level : raid5
Raid Devices : 5
Avail Dev Size : 1953263024 (931.39 GiB 1000.07 GB)
Array Size : 3906525184 (3725.55 GiB 4000.28 GB)
Used Dev Size : 1953262592 (931.39 GiB 1000.07 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
State : clean
Device UUID : f729ddca:adb2eaec:748ad0b6:0e321903
Update Time : Sat Jul 6 14:29:42 2013
Checksum : 7149bfc6 - correct
Events : 2742
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 1
Array State : AAAAA ('A' == active, '.' == missing)
/dev/sde:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 43222604:a15a957d:313d7b6c:d087ba6a
Name : YSGARD:0
Creation Time : Thu Apr 25 12:38:17 2013
Raid Level : raid5
Raid Devices : 5
Avail Dev Size : 1953263024 (931.39 GiB 1000.07 GB)
Array Size : 3906525184 (3725.55 GiB 4000.28 GB)
Used Dev Size : 1953262592 (931.39 GiB 1000.07 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 83aea2f7:dc6a7d68:0d875248:c54d2bc9
Update Time : Sat Jul 6 14:46:15 2013
Checksum : 713418b2 - correct
Events : 2742
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 2
Array State : ..AAA ('A' == active, '.' == missing)
/dev/sdg:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 43222604:a15a957d:313d7b6c:d087ba6a
Name : YSGARD:0
Creation Time : Thu Apr 25 12:38:17 2013
Raid Level : raid5
Raid Devices : 5
Avail Dev Size : 1953263024 (931.39 GiB 1000.07 GB)
Array Size : 3906525184 (3725.55 GiB 4000.28 GB)
Used Dev Size : 1953262592 (931.39 GiB 1000.07 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
State : clean
Device UUID : b8295773:a4a73e18:6a097100:15ecc829
Update Time : Sat Jul 6 14:46:15 2013
Checksum : b565f15d - correct
Events : 2742
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 4
Array State : ..AAA ('A' == active, '.' == missing)
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