Ben Beuchler wrote:
umount /dev/sdb4
mdadm --build /dev/md0 --level=1 -n2 /dev/sdb4 missing
mount /dev/md0 /mail
mdadm --add /dev/md0 /dev/sda4
Will that work? Or am I misunderstanding something fundamental?
It'll work but you'll be using a legacy array without superblocks, so you
can't have various features that come with superblocks
Right; for this particular application I'm willing to give up
superblocks. Just to be 100% sure, thought: the way I've described
the process would be non-destructive of the data on sdb4?
Thanks!
Actually, if on that sdb4 is a shrinkable filesystem, you can create md
raid with superblock at the end. So the process would be something like:
- resize2fs filesystem on sdb4 a bit (shrink)
- mdadm stuff with e.g. 1.0 superblock
- resize2fs filesystem again, this time on md0
According to md(4) you shouldn't need to shrink more than 128KB, but be
sure to get a healthy margin. Or do simple test with some tiny
partition, or md-on-lvm.
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