On 12/31/2009 11:27 AM, James Bensley wrote:
>
> I can't say this with 100% certainty but I would of thought that it
> would been fine. I've lost my mdadm.conf (reinstalled OS) with a
> separate 4 disk RAID 5 array and re-assembled the array and carried on
> as if nothing had happened.
>
Yes, in general, you don't need the mdadm.conf at all. As long as the
array is built out of partitions marked as type "fd: Linux raid autodetect".
However, whenever CentOS installs a new kernel and initrd image file, it
creates (or uses?) an mdadm.conf file within the initial boot
environment. Back when I was migrating a server to a new environment, I
had to unpack the image, edit that copy of mdadm.conf, and then repack
it all in order to get a proper boot.
So I suspect (but am not certain) that the ARRAY lines in
/etc/mdadm.conf are useless on a CentOS system but that the ARRAY lines
inside the initrd image file are the real ones used. But the former may
be used to generate the latter when you install a new kernel.
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