Re: Adding disks with raid to existing raid system.

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On Sun, Mar 14, 2010 at 10:23 PM, Simon Matthews
<simon.d.matthews@xxxxxxxxx> wrote:
> I have just built a system and have it booting off a software raid
> partition. The raid sets use devices /dev/md0, /dev/hd1, /dev/md2,
> /dev/md3.
>
> I now need to transfer some additional disks to this system. These
> disks are presently in another system where they host a number of raid
> sets, currently also /dev/md0 - /dev/md4.
>
> I need to ensure that the data on the raid set that I am adding to the
> system is not lost. However, clearly, I can't have the raid sets on
> these disks come up as /dev/md0-md4. How do I ensure this and have
> these raid sets come up on /dev/md5 and higher?
>
> Simon
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Either use an mdadm.conf to specify the mapping of UUID to md device
(which will over-ride any auto-detected requests), or use the
home-host fallback.  Obviously the administrator specifying how they'd
prefer mdadm to assemble the drives is preferable.

You will probably want to regenerate your initrd; if you are using
auto-assembly on root without an initrd, I highly suggest upgrading to
use an initrd/initramfs.  You might find this one easy to customize
for your needs if your distribution lacks one or you dislike the one
it generates: http://sourceforge.net/projects/aeuio/
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