On 6/24/2011 10:59 AM, Iordan Iordanov wrote:
On 06/24/11 12:35, maurice wrote:
Set aside (disconnect) 1 of the existing 2 disks.
Boot from emergency recovery media, making sure the md version is
relatively current ( newer than 3.0 ?)
Create the R10 with the other 2 disks ( 1 old and 1 new) with 1 of the 3
disks missing.
I think I have to wipe the superblock on the disk that was formerly part
of the RAID1 set.
I think your procedure can be made less risky by making a R10, with
layout f3 with *two* missing disks. Since there are *3* copies in the
R10, there is no problem with having just one "real" disk and two
missing ones. This way, you don't have to live with just one of the R1
disks and hope it doesn't go bad during the copy operation.
Then, you copy the data from your old R1 to your new R10 with the two
missing disks. When the data is copied over, you can remove *one* of
the disks from the R1, zero the superblock, and add it to the R10.
When the rebuild is complete, and only then, zero the superblock of
your last R1 disk, and add it to the R10.
With this mod, your data never really lost redundancy during the
entire procedure (except when you remove the first disk from the R1
and move it to the R10, but instead of redundancy, you have 2 copies -
one on the R10 and one on the R1 at that point, so it's still
redundant in a way).
Whether or not you use this revised procedure, write yourself a
step-by-step guide with all the commands (a TO-DO list), and if you
want, you can share it with the list if you're not confident.
Thanks, this makes really good sense, and sounds VERY safe.
As for the "TO-DO list" or "recipe" I still lack the skills to produce
the syntax.
--
Cheers,
Maurice Hilarius
eMail: /mhilarius@xxxxxxxxx/
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