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From: John Stumbles on 4 Feb 2010 20:40
On Fri, 05 Feb 2010 01:10:48 +0100, Aragorn wrote:

> Well, it is possible for two specimens of the same RAID controller to
> differently format the disks so that they are only usable on the
> controller they were formatted on.

The disks (originally both) were set up in mdadm raid on one of the
now-defunct cards, and have been working (individually, each as one-drive
degraded arrays) on different SATA cards (one in a different machine, also).


>> Normally I do. The machine also has an external USB drive attached
>> which is used for backups and that had stopped working.
>
> This is another thing to investigate. Could be related...

However the problem persists with the external drive disconnected.


> Okay, so the SATA card sees the disk and the kernel also sees it. My
> guess at this stage would be filesystem damage which may have erased
> your "/etc/mdadm.conf" or damaged your boot-up scripts.

(/etc/mdadm/mdadm.conf on Debian)

OK, interesting: on this (working) machine I have:

# definitions of existing MD arrays
ARRAY /dev/md0 level=raid1 num-devices=2 UUID=4a6e4532:24b424ec:5e4f9433:29cb5540

but the ARRAY ... line is missing on the non-working machine. From my
notes of what I did when I was setting up that machine there never was an
ARRAY ... line - and yet it worked!

---8<--- more informative stuff to get my brain around ;-) ---8<---



--
John Stumbles

I'd rather have a full bottle in front of me
Than a full-frontal lobotomy
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