PendingReleaseNotes: Update mclock release note regarding an existing issue

Signed-off-by: Sridhar Seshasayee <sseshasa@redhat.com>

diff --git a/PendingReleaseNotes b/PendingReleaseNotes
index 10bd8ce5b5b3be238ed139d0c8ab11c0bf652f7d..ee7ec9145318ff314b32beab6d84f07055a2462e 100644 (file)
--- a/PendingReleaseNotes
+++ b/PendingReleaseNotes
@@ -64,14 +64,21 @@
 * RGW: `radosgw-admin realm delete` is now renamed to `radosgw-admin realm rm`. This
   is consistent with the help message.
 
-* OSD: Ceph now uses mclock_scheduler for bluestore OSDs as its default osd_op_queue
+* OSD: Ceph now uses mclock_scheduler for BlueStore OSDs as its default osd_op_queue
   to provide QoS. The 'mclock_scheduler' is not supported for filestore OSDs.
-  Therefore, the default 'osd_op_queue' is set to 'wpq' for filestore OSDs
+  Therefore, the default 'osd_op_queue' is set to 'wpq' for Filestore OSDs
   and is enforced even if the user attempts to change it. For more details on
   configuring mclock see,
 
   https://docs.ceph.com/en/latest/rados/configuration/mclock-config-ref/
 
+  An outstanding issue exists during runtime where the mclock config options
+  related to reservation, weight and limit cannot be modified after switching
+  to the 'custom' mclock profile using the "ceph config set ..." command.
+  This is tracked by: https://tracker.ceph.com/issues/55153. Until the issue is
+  fixed, users are advised to avoid using the 'custom' profile or use the
+  workaround mentioned in the tracker.
+
 * CephFS: Failure to replay the journal by a standby-replay daemon will now
   cause the rank to be marked damaged.