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Hi and welcome,
On 09.02.2018 15:46, ST Wong (ITSC)
wrote:
Hi, I'm new to CEPH and
got a task to setup CEPH with kind of DR feature. We've 2
10Gb connected data centers in the same campus. I wonder if
it's possible to setup a CEPH cluster with following
components in each data center:
3 x mon + mds + mgr
3 x OSD (replicated
factor=2, between data center)
So that any one of
following failure won't affect the cluster's operation and
data availability:
- any one component in either data center
- failure of either one of the data center
Is it possible?
In general this is possible, but I would consider that replica=2 is
not a good idea. In case of a failure scenario or just maintenance
and one DC is powered off and just one single disk fails on the
other DC, this can already lead to data loss. My advice here would
be, if anyhow possible, please don't do replica=2.
In case one data center
failure case, seems replication can't occur any more. Any
CRUSH rule can achieve this purpose?
Sorry for the newbie
question.
Thanks a lot.
Regards
/st wong
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