Re: v0.87 Giant released

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On Thu, 30 Oct 2014 10:40:38 +1100 Nigel Williams wrote:

> On 30/10/2014 8:56 AM, Sage Weil wrote:
> > * *Degraded vs misplaced*: the Ceph health reports from 'ceph -s' and
> >    related commands now make a distinction between data that is
> >    degraded (there are fewer than the desired number of copies) and
> >    data that is misplaced (stored in the wrong location in the
> >    cluster).
> 
> Is someone able to briefly described how/why misplaced happens please,
> is it repaired eventually? I've not seen misplaced (yet).
> 
Any time there is a change in data placement, be it a change in the CRUSH
map like modifying the weight of an OSD or simply adding a new OSD.
Thus objects are (temporarily) not where they're supposed to be, but still
present in sufficient replication. 
A much more benign scenario than degraded and I hope that this doesn't
even generate a WARN in the "ceph -s" report.

Christian
-- 
Christian Balzer        Network/Systems Engineer                
chibi@xxxxxxx   	Global OnLine Japan/Fusion Communications
http://www.gol.com/
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