From 4ac92dcaeb412525fd7a0c970e829cbd2ad05dd8 Mon Sep 17 00:00:00 2001 From: Sridhar Seshasayee Date: Thu, 25 Mar 2021 21:11:21 +0530 Subject: [PATCH] doc: Add release note for mclock scheduler refinements and profiles Signed-off-by: Sridhar Seshasayee --- doc/releases/pacific.rst | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/doc/releases/pacific.rst b/doc/releases/pacific.rst index c1eec7acabf..7a890a454a8 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. + -- 2.39.5