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PendingReleaseNotes: added note related to new mds upgrade option using cephadm

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Signed-off-by: Dhairya Parmar <dparmar@redhat.com>
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dparmar18 2022-06-13 19:41:40 +05:30
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@ -78,3 +78,15 @@ Relevant tracker: https://tracker.ceph.com/issues/55521
<MAPPING_PREFIX><poolid>_<snapid>_
without the object-unique suffix. The conversion is fixed in this release.
Relevant tracker: https://tracker.ceph.com/issues/5614
* Cephadm may now be configured to carry out CephFS MDS upgrades without
reducing ``max_mds`` to 1. Previously, Cephadm would reduce ``max_mds`` to 1 to
avoid having two active MDS modifying on-disk structures with new versions,
communicating cross-version-incompatible messages, or other potential
incompatibilities. This could be disruptive for large-scale CephFS deployments
because the cluster cannot easily reduce active MDS daemons to 1.
NOTE: Staggered upgrade of the mons/mgrs may be necessary to take advantage
of the feature, refer this link on how to perform it:
https://docs.ceph.com/en/quincy/cephadm/upgrade/#staggered-upgrade
Relevant tracker: https://tracker.ceph.com/issues/55715