Oh yeah, it's possible - I've done it in connection with disaster
recovery (or rather, attempt thereof).
The key is to write 'missing' instead of the device name, so you just go
mdadm -C /dev/md0 --raid-level=5 --raid-devices=3 /dev/hdxx /dev/hdyy
missing
-note that the missing drive can be anywhere you like.
Regards, Troels
On Feb 9, 2006, at 12:40 , stephan sperber wrote:
Hello!
Is it possible to create a Radi5 with only 2 disks? (I know that Raid5
needs 3 to be really redundant)
With a Raid1 I can do things like:
mdadm -C /dev/md0 --force --raid-devices=1 /dev/hdb2
mkreiserfs /dev/md0
copy files from an older drive to the raid, get the old drive out
and put
the new disk for the raid in.
then
mdadm -G /dev/md0 --raid-disks=2
mdadm -a /dev/md0 /dev/hdc2
and the raid1 is now a real raid1 (after sync)
It would be great to have something similar for raid5:
mdadm -C /dev/md0 --force --raid-devices=2 /dev/hdb2 /dev/hdc2
mdadm -G /dev/md0 --raid-disks=3
mdadm -a /dev/md0 /dev/hda2
or
mdadm -C /dev/md0 --force --fail=/dev/hda2 --raid-devices=3 /dev/
hdb2 /
dev/hdc2
mdadm -a /dev/md0 /dev/hda2
i know that this is possible with raidtools and /etc/raidtab.
is this possible with the recent version of mdadm or is it a planned
feature (or not planned)?
thanks in advance
stephan
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