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doc/cephfs/standby: document mds_join_fs

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Signed-off-by: Sage Weil <sage@redhat.com>
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Sage Weil 2019-12-18 14:00:42 -06:00
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PendingReleaseNotes
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@ -282,3 +282,6 @@
would not allow a pool to ever have completely balanced PGs. For example, if
crush requires 1 replica on each of 3 racks, but there are fewer OSDs in 1 of
the racks. In those cases, the configuration value can be increased.
* MDS daemons can now be assigned to manage a particular file system via the
new ``mds_join_fs`` option.

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doc/cephfs/standby.rst
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@ -26,6 +26,10 @@ A daemon has a *name* that is set statically by the administrator
when the daemon is first configured. Typical configurations
use the hostname where the daemon runs as the daemon name.
A ceph-mds daemons can be assigned to a particular file system by
setting the `mds_join_fs` configuration option to the file system
name.
Each time a daemon starts up, it is also assigned a *GID*, which
is unique to this particular process lifetime of the daemon. The
GID is an integer.