From: Sage Weil Date: Mon, 7 Jul 2014 14:05:38 +0000 (-0700) Subject: doc/release-notes: clarify CRUSH notes about tunables X-Git-Tag: v0.84~144 X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=cf5f5351252159ec630b4c16571e9ed388fa08e8;p=ceph.git doc/release-notes: clarify CRUSH notes about tunables Signed-off-by: Sage Weil --- diff --git a/doc/release-notes.rst b/doc/release-notes.rst index ebd560151510..df6292694867 100644 --- a/doc/release-notes.rst +++ b/doc/release-notes.rst @@ -265,10 +265,15 @@ Upgrading from v0.72 Emperor * The 'osd pool create ...' syntax has changed for erasure pools. -* The default CRUSH rules and layouts are now using the latest and - greatest tunables and defaults. Clusters using the old values will +* The default CRUSH rules and layouts are now using the 'bobtail' + tunables and defaults. Upgaded clusters using the old values will now present with a health WARN state. This can be disabled by - adding 'mon warn on legacy crush tunables = false' to ceph.conf. + adding 'mon warn on legacy crush tunables = false' to ceph.conf and + restarting the monitors. Alternatively, you can switch to the new + tunables with 'ceph osd crush tunables firefly,' but keep in mind + that this will involve moving a significant portion of the data + already stored in the cluster and in a large cluster may take + several days to complete. * We now default to the 'bobtail' CRUSH tunable values that are first supported by Ceph clients in bobtail (v0.56) and Linux kernel version v3.9. If you