Am 06.03.2007 um 08:37 schrieb dean gaudet:
On Tue, 6 Mar 2007, Neil Brown wrote:
On Monday March 5, ralf@xxxxxxxx wrote:
Is it possible to mark a disk as "to be replaced by an existing
spare",
then migrate to the spare disk and kick the old disk _after_
migration
has been done? Or not even kick - but mark as new spare.
No, this is not possible yet.
You can get nearly all the way there by:
- add an internal bitmap.
- fail one drive
- --build a raid1 with that drive (and the other missing)
- re-add the raid1 into the raid5
- add the new drive to the raid1
- wait for resync
i have an example at
<http://arctic.org/~dean/proactive-raid5-disk-replacement.txt>... plus
discussion as to why this isn't the best solution.
Oops - you are right. While in raid1-resync-state there is no redundancy
for the disk that should be replaced and therefore I lose a lot of
redundancy
for the raid5 above it. When I replace a disk that is in a good state -
everything is fine. When I replace one with read problems - I simply
lose.
Not as good as I thought first ...
A build in solution would be able to avoid such problems - right.
Ralf Mueller
--
Van Roy's Law: -------------------------------------------------------
An unbreakable toy is useful for breaking other toys.
-
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
