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Merge PR #20903 into master

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* refs/pull/20903/head:
	PendingReleaseNotes: add note about upgrading MDS

Reviewed-by: Zheng Yan <zyan@redhat.com>
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Patrick Donnelly 2018-03-17 11:30:23 -07:00
commit c498abe2f0
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PendingReleaseNotes
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@ -3,6 +3,18 @@
* *CephFS*:
* Upgrading an MDS cluster to 12.2.3+ will result in all active MDS
exiting due to feature incompatibilities once an upgraded MDS comes online
(even as standby). Operators may ignore the error messages and continue
upgrading/restarting or follow this upgrade sequence:
Reduce the number of ranks to 1 (`ceph fs set <fs_name> max_mds 1`),
deactivate all other ranks (`ceph mds deactivate <fs_name>:<n>`), shutdown
standbys leaving the one active MDS, upgrade the single active MDS, then
upgrade/start standbys. Finally, restore the previous max_mds.
See also: https://tracker.ceph.com/issues/23172
* Several "ceph mds" commands have been obsoleted and replaced
by equivalent "ceph fs" commands:
- mds dump -> fs dump