PendingReleaseNotes: mention target_size_ratio change

Signed-off-by: Josh Durgin <jdurgin@redhat.com>

diff --git a/PendingReleaseNotes b/PendingReleaseNotes
index 6cfbaacc16662f14a26740bb57b5d24fb64b1062..a6237e45d3606aa1551b74176cdb285fa0a86f3d 100644 (file)
--- a/PendingReleaseNotes
+++ b/PendingReleaseNotes
@@ -226,6 +226,15 @@
   autoscaling, see :ref:`pg-autoscaler`.  Note that existing pools in
   upgraded clusters will still be set to ``warn`` by default.
 
+* The pool parameter ``target_size_ratio``, used by the pg autoscaler,
+  has changed meaning. It is now normalized across pools, rather than
+  specifying an absolute ratio. For details, see :ref:`pg-autoscaler`.
+  If you have set target size ratios on any pools, you may want to set
+  these pools to autoscale ``warn`` mode to avoid data movement during
+  the upgrade::
+
+    ceph osd pool set <pool-name> pg_autoscale_mode warn
+
 * The ``upmap_max_iterations`` config option of mgr/balancer has been
   renamed to ``upmap_max_optimizations`` to better match its behaviour.