PendingReleaseNotes: discuss snap trim improvements

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

diff --git a/PendingReleaseNotes b/PendingReleaseNotes
index 6743d6fed455d7c6a28970eebe8b71d5f3dd2606..cca45304244f6f2aef7a51ba2464c5f4868c22c3 100644 (file)
--- a/PendingReleaseNotes
+++ b/PendingReleaseNotes
@@ -5,3 +5,9 @@
   is enabled (it's off by default).  This means that a VM using librbd that
   previously would have gotten an EIO and gone read-only will now see a
   blocked/hung IO instead.
+* 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.
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