Lieven Van Acker wrote:
Hey folks,
I didn't find any direct pointers on this issue, so maybe you experts can advice me...
I was setting up a system, had only one disk at setup time but wanted to configure raid 1 in advance...
so I used
mdadm --create /dev/md0 --force --run --level=1 --raid-devices=1
/dev/sda1
On your new disk try this: mdadm --create /dev/md1 --level=1 --raid-devices=2 /dev/sdb1 missing
Then make a filesystem on it and copy over the data from /dev/md0 then stop /dev/md0
Once you've done all that try:
mdadm /dev/md1 -a /dev/sda1
I think that'll get you where you want to be.
you may want to hang back a while in case I made a typo ;)
David
PS from the manpage:
Setting a value of 1 is probably a mistake and so requires that --force be specified first.
Guess what ;)
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