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doc: outline steps to take CephFS fs down

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Fixes: https://tracker.ceph.com/issues/23427

Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>
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Patrick Donnelly 2018-04-05 20:06:29 -07:00
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doc/cephfs/administration.rst
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@ -74,6 +74,22 @@ appear to be eg. exabytes in size, causing load on the MDS as it tries
to enumerate the objects during operations like stats or deletes.
Taking the cluster down
-----------------------
Taking a CephFS cluster down is done by reducing the number of ranks to 1,
setting the cluster_down flag, and then failing the last rank. For example:
::
ceph fs set <fs_name> max_mds 1
ceph mds deactivate <fs_name>:1 # rank 2 of 2
ceph status # wait for rank 1 to finish stopping
ceph fs set <fs_name> cluster_down true
ceph mds fail <fs_name>:0
Setting the ``cluster_down`` flag prevents standbys from taking over the failed
rank.
Daemons
-------