From 4eee3db1977f4008ef7fdf6d49295005250b9ce8 Mon Sep 17 00:00:00 2001 From: Sridhar Seshasayee Date: Wed, 24 Mar 2021 13:22:03 +0530 Subject: [PATCH] PendingReleaseNotes: Document mclock scheduler refinements and profiles Signed-off-by: Sridhar Seshasayee --- PendingReleaseNotes | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/PendingReleaseNotes b/PendingReleaseNotes index 463d2951c63ff..1c7cb08a6eac1 100644 --- a/PendingReleaseNotes +++ b/PendingReleaseNotes @@ -68,6 +68,14 @@ 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. + >=15.0.0 -------- -- 2.39.5