Messages in this thread | | | Date | Mon, 20 Mar 2006 14:02:32 +0100 | From | Sander <> | Subject | RAID5 grow success (was: Re: 2.6.16-rc6-mm2) |
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Andrew Morton wrote (ao): > - Lots of MD and DM updates
I would like to report that growing an online raid5 device works like a charm:
mdadm --version mdadm - v2.4-pre1 - Not For Production Use - 20 March 2006
mdadm -C -l5 -n3 /dev/md0 /dev/sda1 /dev/sdb1 /dev/sdc1
While performing: for i in `seq 4` do dd if=/dev/zero of=bigfile.$i bs=1024k count=10000 done md5sum bigfile.*
I do: mdadm /dev/md0 -a /dev/sdd1
mdadm --grow /dev/md0 --raid-disks=4
When the dd and md5sum finishes, I umount and:
e2fsck -f /dev/md0 resize2fs -p /dev/md0
After mounting again the disk indeed is bigger, and the md5sum still matches.
FWIW, I now try to add four more spares at once, and grow the raid5 again. It seems to work:
# mdadm /dev/md0 -a /dev/sde1 /dev/sdf1 /dev/sdg1 /dev/sdh1 mdadm: added /dev/sde1 mdadm: added /dev/sdf1 mdadm: added /dev/sdg1 mdadm: added /dev/sdh1 # mdadm --grow /dev/md0 --raid-disks=8 mdadm: Need to backup 448K of critical section.. mdadm: ... critical section passed. #
It is still reshapeing ATM.
Thanks!
Sander
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