rename md array? 2006-04-27 - By Stephen C. Tweedie
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Hi,
On Wed, 2006-04-26 at 07:34 -0700, Christopher McCrory wrote:
> It is possible, and if so how, to rename a raid array? I have a
> (simplified example) raid data partition (/dev/md3) that I need to move
> the drives to another server that already has a /dev/md3 data partition.
> IIRC, the last time I did this I was not able to mount the moved array.
> Or am I mis-remembering?
Last time I did this it was from a later distribution --- either a
RHEL-4 (See http://HEL-4.ora-code.com) or FC-5 rescue CD, I cannot recall which at this point. I did it
precisely for the reason you give, to move an existing /dev/md0 to
another RHEL-4 (See http://HEL-4.ora-code.com) box. But it wasn't hard, using mdadm. Knowing the
devices belonging to the array (sda5 and sdb5 in this case), I just did:
# mdadm --stop /dev/md0
# mdadm -A /dev/md6 -m0 --update=super-minor /dev/sda5 /dev/sdb5
which stops the array as /dev/md0 and then reassembles it as /dev/md6.
The reassembly looks for devices which have an existing minor number of
0, not 6 (-m0), and then updates the minors in the superblocks to the
new number.
I believe the same options are present in taroon's mdadm.
--Stephen
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