Jonathan wrote:
> /dev/md0 591G 54G 507G 10% /md0
Hrm. Have you been hassling us for a mere 54G worth of data?
(Just kidding :-D.)
> now I'm doing a:
> (cd /md0 && tar cf - . ) | (cd /virtual/recover/ && tar xvfp -)
I wonder - if you have the disk space, why not take David Greaves'
advice and create a backup of the individual disks before fiddling
with md superblocks?
Anyway, a quick cheat sheet might come in handy:
* Hot-add a disk to an array (outdated raid data on that disk won't be used):
# mdadm /dev/md1 --add /dev/etherd/e0.xyz
* Check that parity is OK for an entire array:
# echo check > /sys/block/md1/md/sync_action
* Manually start a resync:
# echo repair > /sys/block/md1/md/sync_action
* Experiment with MDADM by using sparse files:
# dd if=/dev/zero of=sparse0 bs=1M seek=200000 count=1
# dd if=/dev/zero of=sparse1 bs=1M seek=200000 count=1
# dd if=/dev/zero of=sparse2 bs=1M seek=200000 count=1
# dd if=/dev/zero of=sparse3 bs=1M seek=200000 count=1
# losetup /dev/loop0 sparse0
# losetup /dev/loop1 sparse1
# losetup /dev/loop2 sparse2
# losetup /dev/loop3 sparse3
# mdadm -C /dev/md5 -c 32 -p left-a -n 4 -l 5 missing /dev/loop{1,2,3}
> thank you thank you thank you thank you thank you thank you
np.
(wait, does that mean I won't get my money? ;-))
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