From: Josh Durgin <jdurgin@redhat.com>
Date: Sat, 1 Feb 2020 20:28:33 +0000 (-0500)
Subject: PendingReleaseNotes: mention target_size_ratio change
X-Git-Tag: v15.1.1~489^2~4
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=9118065c4c3803f8a2c26c28c69ffc9f14ff260a;p=ceph.git

PendingReleaseNotes: mention target_size_ratio change

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

diff --git a/PendingReleaseNotes b/PendingReleaseNotes
index 6cfbaacc1666..a6237e45d360 100644
--- 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.