doc/man/rbd: Mention changed `bluestore_min_alloc_size`

This change was done in: https://github.com/ceph/ceph/pull/34588

Signed-off-by: Niklas Hambüchen <mail@nh2.me>
(cherry picked from commit 254025343b1c49e1d0aa72fdea0cbe0483704245)

diff --git a/doc/man/8/rbd.rst b/doc/man/8/rbd.rst
index e50086bfbaeb509842861049b8a0a5775d4482f1..57423348dfa512dea93ddd5937173c3a840bd998 100644 (file)
--- a/doc/man/8/rbd.rst
+++ b/doc/man/8/rbd.rst
@@ -825,7 +825,8 @@ Per mapping (block device) `rbd device map` options:
 * alloc_size - Minimum allocation unit of the underlying OSD object store
   backend (since 5.1, default is 64K bytes).  This is used to round off and
   drop discards that are too small.  For bluestore, the recommended setting is
-  bluestore_min_alloc_size (typically 64K for hard disk drives and 16K for
+  bluestore_min_alloc_size (currently set to 4K for all types of drives,
+  previously used to be set to 64K for hard disk drives and 16K for
   solid-state drives).  For filestore with filestore_punch_hole = false, the
   recommended setting is image object size (typically 4M).