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doc/release/nautilus: proscribe minimum hammer tunables and straw2 on upgrade

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Signed-off-by: Sage Weil <sage@redhat.com>
This commit is contained in:
Sage Weil 2019-04-12 16:41:38 -05:00
parent aa4238f025
commit 9b979a5c5d
2 changed files with 25 additions and 0 deletions
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3
doc/rados/operations/balancer.rst
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@ -1,3 +1,6 @@
.. _balancer:
Balancer
========

22
doc/releases/nautilus.rst
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@ -319,6 +319,28 @@ Instructions
#. Verify the cluster is healthy with ``ceph health``.
If your CRUSH tunables are older than Hammer, Ceph will now issue a
health warning. If you see a health alert to that effect, you can
revert this change with::
ceph config set mon mon_crush_min_required_version firefly
If Ceph does not complain, however, then we recommend you also
switch any existing CRUSH buckets to straw2, which was added back
in the Hammer release. If you have any 'straw' buckets, this will
result in a modest amount of data movement, but generally nothing
too severe.::
ceph osd getcrushmap -o backup-crushmap
ceph osd crush set-all-straw-buckets-to-straw2
If there are problems, you can easily revert with::
ceph osd setcrushmap -i backup-crushmap
Moving to 'straw2' buckets will unlock a few recent features, like
the `crush-compat` :ref:`balancer <balancer>` mode added back in Luminous.
#. To enable the new :ref:`v2 network protocol <msgr2>`, issue the
following command::