As mon should be deployed in odd numbers, and I have a fourth node, can I deploy a fourth mds only? - 14.2.7 - ceph-users

8 Feb 2020

Presently I have about 1.2B objects (400M w/3 Replicas) and I'm finding the PG
scrubbing and deep scrubbing are not completing.  There is only 1 client accessing the
data, a Samba server.  I found large disparities in PG Distribution and Drive utilization.
 I enabled pg_autoscaler and found that it was reducing the number of PGs per OSD from 116
to 104.5 at this time, but it wasn't helping with space consumption equalization.  I
found loadbalancer and enabled that and it is in the process of evening out.  As we were
also having mds crashes even after increasing mds memory, i tried enabling multimds with
rank:2

I currently have only 1 spare and would like to potentially enable the mds component on
the fourth node (no mon present) but am having some difficulty.

Is mon a requirement?

I tried ceph-deploy mds create node4 but am having errors.  I tried manually creating the
/var/lib/ceph/mds/node4 directory and the command to create the keyring but still no joy.

What am i missing?

Thanks,