Robin Hill wrote:
On Wed May 08, 2013 at 04:19:33PM +0200, Roberto Nunnari wrote:
Robin Hill wrote:
On Fri May 03, 2013 at 06:28:02PM +0200, Roberto Nunnari wrote:
Robin Hill wrote:
The safest option would be:
- add in the new disks
- partition to at least the same size as your existing partitions (they
can be larger)
- add the new partitions into the arrays (they'll go in as spares)
- grow the arrays to 4 members (this avoids any loss of redundancy)
- wait for the resync to complete
- install grub/lilo/syslinux to the new disks
- fail and remove the old disk partitions from the arrays
- shrink the arrays back down to 2 members
- remove the old disks
Then, if you're keeping the same number of partitions but increasing the
size:
Ok.. got here.
- grow the arrays to fill the partitions
- grow the filesystems to fill the arrays
Now the scary part.. so.. here I believe I should give the following
commands:
mdadm --grow /dev/md0 --size=max
mdadm --grow /dev/md1 --size=max
mdadm --grow /dev/md2 --size=max
Yep, that's right. Make sure they've actually grown to the correct size
before you progress though - I have had one occasion where using
--size=max actually ended up shrinking the array and I had to manually
work out the size to use in order to recover. That was using an older
version of mdadm though, and I've not seen it happen since.
and after that
fsck /dev/md0
fsck /dev/md1
fsck /dev/md2
You'll need 'fsck -f' here to force it to run.
humm.. as /dev/md0 is mounted on / I probably should boot from a cd, and
run fsck and resize2fs from there.. maybe using UUIDs, right?
You can just skip the fsck and run resize2fs - it'll work fine on a
mounted filesystem. It'll probably be safer to do it offline though.
Cheers,
Robin
I'd rather stay on the safe side.. how do I assemble the array if I boot
from a cd?
something like:
mdadm --scan --assemble --uuid=a26bf396:31389f83:0df1722d:f404fe4c
would to the job and let me with a /dev/mdX I will be able to work with
(fsck and resize2fs)?
Thank you.
Robi
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