Hi all,
I'm hoping to get some help with a raid5 container that went belly-up on me.
Keep in mind I'm relatively noob with Linux.
Last year I bought an 8 TB NAS box (iomega ix4-200d) which came as a raid 5
standalone unit, running a Debian Linux OS.
Last week it declared drive 4 was in an error state so I replaced the drive and
waited for it to rebuild. Overnight I got 3 emails from the unit stating:
1) That a "recoverable error" occurred on drive 1
2) That the raid rebuild had completed
3) That the StorCenter device had failed and some data loss may have
occurred. Multiple drives may have either failed or been removed from your
storage system.
Of course, none of the drives had been removed. And I don't have confidence
that the drive 4 rebuild completed successfully. Now the until declares that
all 4 drives have been replaced and wants permission to format them.
Luckily, the unit has SSH enabled and I can log in to the CLI. But this is
where I need some help. I want to force the array to come back online to see
what I can salvage from it. The vendor's only suggestion was to send the
drives in and for $4000-$5000 they would attempt data recovery for me.
I've been reading up on MDADM and have some info on the state of the
container...
root@NAS2:/# mdadm --detail /dev/md1
/dev/md1:
Version : 01.00
Creation Time : Thu Mar 25 19:28:35 2010
Raid Level : raid5
Used Dev Size : 1951474176 (1861.07 GiB 1998.31 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 1
Persistence : Superblock is persistent
Update Time : Tue Oct 25 02:24:28 2011
State : active, degraded, Not Started
Active Devices : 2
Working Devices : 4
Failed Devices : 0
Spare Devices : 2
Layout : left-symmetric
Chunk Size : 64K
Name : storage:1
UUID : 53758a21:e972eb25:0c4ddf95:f4dd42b8
Events : 212414
Number Major Minor RaidDevice State
0 0 0 0 removed
1 8 18 1 active sync /dev/sdb2
2 8 34 2 active sync /dev/sdc2
3 0 0 3 removed
0 8 2 - spare /dev/sda2
4 8 50 - spare /dev/sdd2
Can anyone offer guidance on how to safely force these drives back online? I'm
thinking that if I can get drive 1 back online the array should come back alive
and I can copy data off of it. Even if drive 4 never completed rebuilding the
data should be there.
Thanks in advance,
Steve
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