doc/rbd: documented 'rbd compression hint' config option

Signed-off-by: Jason Dillaman <dillaman@redhat.com>
(cherry picked from commit d611a9860a5cbbdb0bf8f8d958b86fef5ea74fb2)

diff --git a/doc/rbd/rbd-config-ref.rst b/doc/rbd/rbd-config-ref.rst
index 8fdc8a322fc72a74362c1b9d98b0c32170f5bc5a..2fa313b7032e4dc8ac2b85e3d785e5cba82b3c0b 100644 (file)
--- a/doc/rbd/rbd-config-ref.rst
+++ b/doc/rbd/rbd-config-ref.rst
@@ -4,6 +4,17 @@
 
 See `Block Device`_ for additional details.
 
+Generic IO Settings
+===================
+
+``rbd compression hint``
+
+:Description: Hint to send to the OSDs on write operations. If set to `compressible` and the OSD `bluestore compression mode` setting is `passive`, the OSD will attempt to compress the data. If set to `incompressible` and the OSD compression setting is `aggressive`, the OSD will not attempt to compress the data.
+:Type: Enum
+:Required: No
+:Default: ``none``
+:Values: ``none``, ``compressible``, ``incompressible``
+
 Cache Settings
 =======================