On Fri, 19 Aug 2016 01:56:13 +0000 Erick Lazaro wrote:

> Hi.
> 
> I would like to understand how the parameter default OSD min size pool.
Did you read this?
http://docs.ceph.com/docs/hammer/rados/operations/pools/#set-the-number-of-object-replicas

> For example, I set up:
> 
> osd default pool size = 3
> osd default min pool size = 2
> 
> Failing 1 OSD, the ceph will block writing in degraded pgs?

No.
If a 2nd OSD would fail at the same time AND if it had replicas of some of
the PGs on the first failed OSD (not a given in a large cluster), then
your I/O will be blocked given the above values.

Christian
-- 
Christian Balzer        Network/Systems Engineer                
ch...@gol.com           Global OnLine Japan/Rakuten Communications
http://www.gol.com/
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