Hi,
I'm familiar with basic RAID technology but I'm not that familiar with
software RAID on Linux. My system admin is not available as the RAID 5
failure happened early Friday evening. I'd like to recovery the RAID
since it seems the hard-disks are still operational, at least they seem
to be.
The scenario: 1U server with (4) 2TB drives in RAID5 and RAID1
configuration. The system boots to GRUB but root partition doesn't
mount. I get a small shell call BusyBox. I can run mdadm for it.
Running mdadm --examine manually, it seems that sda1, sda3, sdb1, sdb3,
sdc1, sdc3, sdd1, and sdd3 are missing are not active and missing the
super-block. All other devices sdx2-sdx9 are active. Cat /proc/mdstat
shows...
md5 :active (auto-read-only) raid1 sdb8[4] sdc8[5], 204788 blocks super
1.2 [4/2] [_UU_]
md4 :inactive sdb7[4] sdc7[5], 419225 blocks super 1.2
md3 :active (auto-read-only) raid5 sda6[0] sdd6[3] sdc6[5], 6286848
blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/4] [UUUU]
md2 :inactive sdb5[4] sdc5[5], 2096128 blocks super 1.2
md1 :inactive sdb4[4] sdc4[5], 2096128 blocks super 1.2
md0 :active (auto-read-only) raid1 sda2[0] sdd2[3] sdc2[5] sdb2[4],
102388 blocks super 1.2 [4/4] [UUUU]
unused devices: <none>
I hope there aren't any typos as I typed the above manually.
Lastly, thing to note...is that I get an Alert! - Alert!
/dev/disk/by-uuid/c6e309d7-07ce-42e2-9c62-fb53be4b99cc does not exist. I
don't see this device at all, I see 4 drive with different UUIDs.
I'm not sure what to do or what direction I should go in.
Many thanks for any help.
N
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