On 18/09/2014 13:50, m.channappa.nega...@accenture.com wrote:
Even after setting replication size 3 , my data is not getting replicated on
all the 3 nodes.
Example:
root@Cephadmin:/home/oss# ceph osd map storage check1
osdmap e122 pool 'storage' (9) object 'check1' -> pg 9.7c9c5619 (9.1) -> up
([0,2,1], p0) acting ([0,2,1], p0)
pg 9.7c9c5619 (9.1) -> up ([0,2,1], p0) acting ([0,2,1], p0)
Right here it says your data is being replicated for that PG across osd.0 osd.1
osd.3 ([0,2,1]) so yes your data is being replicated across the three nodes.
but here if I shutdown my 2 nodes I will be unable to access data. In actual
scenario I should be able to access / write data as my other 3rd node is up (if
my understanding is correct). Please let me know where I am wrong.
Where are your mons situated? If you have 3 mons across 3 nodes once two are
shut down you'll only have 1 mon left, 1/3 will fail quorum and so the cluster
will stop taking data to prevent split-brain scenarios. For 2 nodes to be down
and the cluster to continue to operate you'd need a minimum of 5 mons or you'd
need to move your mons away from your osd's.
-Michael
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