Matthew Miller wrote:
On Fri, Apr 04, 2008 at 11:54:55PM -0500, Les Mikesell wrote:
I think it will pick one of each of the mdN devices and ignore the other.
It won't eat data unless the mismatched disks have matching UUIDs which is
unlikely unless you image-copied them or had synced with the other set in
the past. If you want it to ignore the new set until you reconfigure it,
fdisk the partition types to something other than FD so it won't autodetect
at boot up.
Okay, thanks. Any suggestions on how to reconfigure it to use higher numbers
on the fly without losing data? I'd like the old md0/md1 to end up as
md2/md3.
If you have a place to hold a backup you can mount one of the underlying
partitions and rsync it somewhere for safekeeping. I've always rebuilt
from scratch when moving mirrors but I think you can use mdadm
--assemble or --create to put them together. A safe approach might be
to use --create to make the new device but only specify one of the
partitions with the other as --missing. Then if the new md device still
has the data, you can mdadm --add the other partition, if it has a
problem you can mount the other partition and copy it over. Even these
operations are slightly dangerous, though since a disk error on either
partition will break things.
--
Les Mikesell
lesmikesell@xxxxxxxxx
