Neil Brown wrote:
On Thursday June 15, irule@xxxxxxxxx wrote:
Hello all,
I'm sorry if this is a silly question, but I've been digging around for
a few days now and have not found a clear answer, so I'm tossing it out
to those who know it best.
I see that as of a few rc's ago, 2.6.17 has had the capability of adding
additional drives to an active raid 5 array (w/ the proper ver of mdadm,
of course). I cannot, however, for the life of me find out exactly how
one goes about doing it! I would love if someone could give a
step-by-step on what needs to be changed in, say, mdadm.conf (if
anything), and what args you need to throw at mdadm to start the reshape
process.
As a point of reference, here's my current mdadm.conf:
DEVICE /dev/sda1
DEVICE /dev/sdb1
DEVICE /dev/sdc1
ARRAY /dev/md0 devices=/dev/sda1,/dev/sdb1,/dev/sdc1 level=5 num-devices=3
May I suggest:
DEVICE /dev/sd?1
ARRAY /dev/md0 UUID=whatever
it would be a lot safer.
I will be adding the devices /dev/sde1 and /dev/sdf1 (when I can find
out how :)
mdadm /dev/md0 --add /dev/sde1 /dev/sdf1
mdadm --grow /dev/md0 --raid-disks=5
NeilBrown
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This might be an even sillier question, but I'll ask it anyway...
If I add a drive to my RAID5 array, what happens to the ext3 filesystem
on top of it? Does it grow automatically? Do I have to take some action
to use the extra space?
Thanks
Nigel
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