PendingReleaseNotes: discuss snap trim improvements

Signed-off-by: Greg Farnum <gfarnum@redhat.com>

diff --git a/PendingReleaseNotes b/PendingReleaseNotes
index 01367280b483e02ccb00e3042df2540eca917829..33f960e9be991fbaa04163a443e4f735d116b4d5 100644 (file)
--- a/PendingReleaseNotes
+++ b/PendingReleaseNotes
@@ -21,3 +21,10 @@
   before::
 
      ceph osd rm osd.123
+
+* This release greatly improves control and throttling of the snap trimmer. It
+  introduces the "osd max trimming pgs" option (defaulting to 2), which limits
+  how many PGs on an OSD can be trimming snapshots at a time. And it restores
+  the safe use of the "osd snap trim sleep" option, wihch defaults to 0 but
+  otherwise adds the given number of seconds in delay between every dispatch
+  of trim operations to the underlying system.