Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 23 insertions, 0 deletions

diff --git a/doc/mgr/mds_autoscaler.rst b/doc/mgr/mds_autoscaler.rst
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+MDS Autoscaler Module
+=====================
+
+The MDS Autoscaler Module monitors file systems to ensure sufficient MDS
+daemons are available. It works by adjusting the placement specification for
+the orchestrator backend of the MDS service. To enable, use:
+
+.. sh:
+
+   ceph mgr module enable mds_autoscaler
+
+The module will monitor the following file system settings to inform
+placement count adjustments:
+
+- ``max_mds`` file system setting
+- ``standby_count_wanted`` file system setting
+
+The Ceph monitor daemons are still responsible for promoting or stopping MDS
+according to these settings. The ``mds_autoscaler`` simply adjusts the
+number of MDS which are spawned by the orchestrator.
+
+.. note: There is no CLI or module configurations as of now. Enable or disable
+   the module to turn on or off.