From: Sridhar Seshasayee Date: Thu, 25 Mar 2021 15:41:21 +0000 (+0530) Subject: doc: Add release note for mclock scheduler refinements and profiles X-Git-Tag: v17.1.0~2418^2~13 X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=4ac92dcaeb412525fd7a0c970e829cbd2ad05dd8;p=ceph.git doc: Add release note for mclock scheduler refinements and profiles Signed-off-by: Sridhar Seshasayee --- diff --git a/doc/releases/pacific.rst b/doc/releases/pacific.rst index c1eec7acabf9..7a890a454a82 100644 --- a/doc/releases/pacific.rst +++ b/doc/releases/pacific.rst @@ -84,4 +84,12 @@ Notable Changes is enabled. This helps with the monitor logs on larger clusters, that may get many 'osd.X reported immediately failed by osd.Y' messages, and confuse tools. +* The mclock scheduler has been refined. A set of built-in profiles are now available that + provide QoS between the internal and external clients of Ceph. To enable the mclock + scheduler, set the config option "osd_op_queue" to "mclock_scheduler". The + "high_client_ops" profile is enabled by default, and allocates more OSD bandwidth to + external client operations than to internal client operations (such as background recovery + and scrubs). Other built-in profiles include "high_recovery_ops" and "balanced". These + built-in profiles optimize the QoS provided to clients of mclock scheduler. +