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documentation: explain ceph osd reweight vs crush weight

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Using the wording from Gregory Farnum at
http://lists.ceph.com/pipermail/ceph-users-ceph.com/2014-June/040961.html

Signed-off-by: Loic Dachary <loic-201408@dachary.org>
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Loic Dachary 2014-09-19 17:19:41 +02:00
parent 9442336f92
commit 639c9818fe
1 changed files with 10 additions and 3 deletions
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13
doc/rados/operations/control.rst
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@ -203,9 +203,16 @@ resending pending requests. ::
ceph osd pause
ceph osd unpause
Set the weight of ``{osd-num}`` to ``{weight}``. Two OSDs with the same weight will receive
roughly the same number of I/O requests and store approximately the
same amount of data. ::
Set the weight of ``{osd-num}`` to ``{weight}``. Two OSDs with the
same weight will receive roughly the same number of I/O requests and
store approximately the same amount of data. ``ceph osd reweight``
sets an override weight on the OSD. This value is in the range 0 to 1,
and forces CRUSH to re-place (1-weight) of the data that would
otherwise live on this drive. It does not change the weights assigned
to the buckets above the OSD in the crush map, and is a corrective
measure in case the normal CRUSH distribution isn't working out quite
right. For instance, if one of your OSDs is at 90% and the others are
at 50%, you could reduce this weight to try and compensate for it. ::
ceph osd reweight {osd-num} {weight}