[ILUG] raid failure

[John Moylan]

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Ahem - S/W RAID is designed to cope with hdd failures, but not with
power failures. (even stated in the HOWTO I think.) In fact even H/W
RAID cards without battery backup units will have problems if the power
goes in the middle of a write.

J

Steven Satelle wrote:
| I have a box in the attic running debian testing, with a raid 1 device
| in it (software raid using mdadm - v1.9.0), I accidentally cut the power
| to the box down today and when it came back up the raid device failed.
| mdadm --examine on both devices in the array show them as being part of
| the array with no problems, I can run fsck on the /dev/hdxx with no
| errors but /dev/MD0 is gone and I haven't a clue how to get it back.
|
| My /etc/mdadm/mdadm.conf fiel contents is:
| earth:~# cat /etc/mdadm/mdadm.conf
| DEVICE partitions
| ARRAY /dev/md0 level=3Draid1 num-devices=3D2
| UUID=3D9d64a945:279503f7:b3f06b53:bbe8a665
|    devices=3D/dev/hda6,/dev/hdb2
|
| when I run:
| mdadm --assemble --scan
| I get back
| mdadm: no devices found for /dev/md0
|
| Does anyone know how to get it back without having to rebuild it?
|
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