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doc: Add "nearest power of two" to PG rule-of-thumb 1438/head
authorFlorian Haas <florian@hastexo.com>
Wed, 12 Mar 2014 18:31:54 +0000 (19:31 +0100)
committerFlorian Haas <florian@hastexo.com>
Wed, 12 Mar 2014 18:51:27 +0000 (19:51 +0100)
commit047287afbe0ddfaaafd05e9dbf25c1c7dea9a1be
tree717e9e8b62cf14213af18a42f1308b74dc3f80c6tree | snapshot
parent9987e486adb43d4b3cb6dcc26086c950e871aecacommit | diff
doc: Add "nearest power of two" to PG rule-of-thumb

Following an IRC discussion, it emerged that it would be helpful
to explain the merit of choosing a number of PGs per pool that is
a power of two, to keep PGs at roughly equal sizes in case of
PG splits.

See http://irclogs.ceph.widodh.nl/index.php?date=2014-03-12 for the
original discussion.

Signed-off-by: Florian Haas <florian@hastexo.com>
doc/rados/operations/placement-groups.rst diff | blob | history
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