Am Mittwoch, den 07.09.2005, 13:58 +0200 schrieb Christoph Gysin:
> Heinz Sporn wrote:
> > Question: may I run mkraid /dev/md0 on the fly now or will that somehow
> > destroy the partition table on the entire disk A ?
>
> This wont't work since only data written to md0 gets mirrored. You can't
> mirror
> an existing partition. An mkraid will probably destroy partition A2.
That I am aware of. A2 will definitely be lost. Would be great
though ;-) Only thing I wasn't sure of is if mkraid or mdadm will touch
anything else aside A2.
>
> You'll have to unmount the partiton A2 and mount md0 at some time. There's no
> way to do this on the fly AFAIK.
>
> But theres still a little shortcut:
>
> First, let me recommend you mdadm. It's a replacement for the old raidtools.
> *Much* better IMHO.
Great tip. Thanx. I will use that.
>
> - Create a new RAID1 in degraded state from B2:
> # mdadm --create /dev/md0 --level 1 --raid-devices 2 /dev/B2 missing
>
> - Copy contents from A2 to md0
> - umount A2
> - add A2 to md0:
> # mdadm /dev/md0 --add /dev/A2
>
> Christoph
> --
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