Cloning 1 hard disk in a software RAID

[Alvin Chang]

On Tue, Jul 28, 2009 at 16:20, Liam Proven <lproven at gmail.com> wrote:

> I have a degraded & rather unstable software RAID on my server. 1 disk
> does not register at all any more & the md subsystem won't mount it as
> being "stale". Another sometimes mounts but won't stay up for long.
>
What does cat /proc/mdstat say? Which RAID level is it?


> <snip>
> dd if=/dev/sdd of=/dev/sde
>
> to copy the whole of the unstable drive onto a new one.
>
> Should this work, or is it a disastrously bad idea or something?

Well, that really depends... if the source drive is broken, you might need
to use something other than dd to clone the disk so that it ignores bad
sectors, e.g. Gohst 4 Linux...

In fact, if you are using RAID5 or above... simply re-initialize the array
with a working blank drive should do the trick.

Good luck,
-- 
Alvin Chang
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