Support #50594: ceph orch / cephadm does not allow deploying multiple MDS daemons per FS per host? - Orchestrator - Ceph

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Support #50594

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ceph orch / cephadm does not allow deploying multiple MDS daemons per FS per host?

Added by Nathan Fish almost 3 years ago. Updated over 2 years ago.

Status:

Resolved

Priority:

Normal

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Description

I have 3 hosts, with lots of cores. I have a filesystem with ~150M files that requires several active MDS daemons to perform well. While one per host is a good default, I should be able to override that, eg:

ceph orch apply mds cephfs_1 3 --placement "6 dc-3558-421 mc-3015-421 m3-3101-421"

ceph orch daemon add mds cephfs_1 $(hostname -s)

^This command does deploy a second MDS on the host, in the right filesystem's namespace.
But I am concerned that it will be suddenly de-scheduled when applying other changes declaratively.
(I am testing on Octopus)