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doc: explain about pgp num

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Explain the significance of pgp num & how it differs from pg num.

Fixes: #10035
Reported-by: Loic Dachary <loic@dachary.org>
Signed-off-by: Abhishek Lekshmanan <abhishek.lekshmanan@ril.com>
This commit is contained in:
Abhishek Lekshmanan 2015-06-16 22:36:54 +05:30
parent 142a6ce711
commit 81eee9bd8c
2 changed files with 11 additions and 4 deletions
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12
doc/rados/operations/placement-groups.rst
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@ -310,10 +310,14 @@ placement groups, execute the following::
ceph osd pool set {pool-name} pg_num {pg_num}
Once you increase the number of placement groups, you must also
increase the number of placement groups for placement (``pgp_num``) before your
cluster will rebalance. The ``pgp_num`` should be equal to the ``pg_num``.
To increase the number of placement groups for placement, execute the
following::
increase the number of placement groups for placement (``pgp_num``)
before your cluster will rebalance. The ``pgp_num`` will be the number of
placement groups that will be considered for placement by the CRUSH
algorithm. Increasing ``pg_num`` splits the placement groups but data
will not be migrated to the newer placement groups until placement
groups for placement, ie. ``pgp_num`` is increased. The ``pgp_num``
should be equal to the ``pg_num``. To increase the number of
placement groups for placement, execute the following::
ceph osd pool set {pool-name} pgp_num {pgp_num}

3
doc/rados/operations/pools.rst
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@ -53,6 +53,8 @@ Create a Pool
Before creating pools, refer to the `Pool, PG and CRUSH Config Reference`_.
Ideally, you should override the default value for the number of placement
groups in your Ceph configuration file, as the default is NOT ideal.
For details on placement group numbers refer to `setting the number of placement groups`_
For example::
osd pool default pg num = 100
@ -568,3 +570,4 @@ a size of 3).
.. _Pool, PG and CRUSH Config Reference: ../../configuration/pool-pg-config-ref
.. _Bloom Filter: http://en.wikipedia.org/wiki/Bloom_filter
.. _setting the number of placement groups: ../placement-groups#set-the-number-of-placement-groups