On Sat, 3 Jan 2015 16:21:29 +1000 Lindsay Mathieson wrote:
> I just added 4 OSD's to my 2 OSD "cluster" (2 Nodes, now have 3 OSD's per
> node).
>
> Given its the weekend and not in use, I've set them all to weight 1, but
> looks like it going to take a while to rebalance ... :)
>
> Is having them all at weight 1 the fastest way to get back to health, or
> is it causing contention?
>
Well, your cluster finished rebuilding already.
To minimize the impact adding one OSD at a time (and maybe increasing its
weight gradually) is the way to go, but that of course will take the
longest as data gets shuffled around over and over again.
What you did causes the least amount of data movement in total, so despite
stressing everything and certainly causing contention in some components,
it is likely the fastest approach.
> Current health:
>
> ceph -s
> cluster f67ef302-5c31-425d-b0fe-cdc0738f7a62
> health HEALTH_WARN 227 pgs backfill; 2 pgs backfilling; 97 pgs
> degraded; 29 pgs recovering; 68 pgs recovery_wait; 97 pgs stuck degraded;
> 326 pgs stuck unclean; recovery 30464/943028 objects degraded (3.230%);
^^^^^^^^
This is a question for the Ceph developers, I was under the impression that
with Giant adding OSDs would just result in misplaced objects, not
degraded ones...
Christian
--
Christian Balzer Network/Systems Engineer
chibi@xxxxxxx Global OnLine Japan/Fusion Communications
http://www.gol.com/
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