----- Message from neilb@xxxxxxx ---------
From: NeilBrown <neilb@xxxxxxx>
Subject: Re: 4-disk raid5 with 2 disks going bad: best way to proceed?
On Thu, 07 Apr 2011 22:13:34 +0200 Nagilum <nagilum@xxxxxxxxxxx> wrote:
Hmm, I think you could:
- add a disk,
- reshape your raid5 to raid6 while using the layout where the raid5
disks aren't really changed
That would be
mdadm --grow /dev/md0 --level=6 --parity=preserve
(I think).
- let it finish syncing
- reshape the raid6 to raid5 taking one of the bad disks out
I don't think that makes sense. (what command would you use exactly?)
I was thinking one fails one of the bad disks and then does something like:
mdadm --grow /dev/md0 --level=5 --raid-devices=4
--backup-file=/root/backup-md4
But obviously I've never tried that and I would play around with
losetup and some files for practice and to see if that works before
starting.
----- End message from neilb@xxxxxxx -----
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