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doc: fix formatting on PG recommendation

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Previous commit (047287afbe) broke
formatting on the formula, and also made mixed formula and text oddly,
which on second thought didn't look too good.

Add the note about the power of two to the following paragraph
instead, in prose.

Signed-off-by: Florian Haas <florian@hastexo.com>
This commit is contained in:
Florian Haas 2014-03-13 11:32:05 +01:00
parent fb4ca9406f
commit 27f06346e2
1 changed files with 5 additions and 4 deletions
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9
doc/rados/operations/placement-groups.rst
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@ -44,14 +44,15 @@ to balance out memory and CPU requirements and per-OSD load. For a single pool
of objects, you can use the following formula::
(OSDs * 100)
Total PGs = ------------ *(rounded up to the nearest power of 2)*
Total PGs = ------------
Replicas
The rounding to the nearest power of two is optional, but recommended
if you want to ensure that all placement groups are roughly the same size.
The result should be **rounded up to the nearest power of two.**
Rounding up is optional, but recommended if you want to ensure that
all placement groups are roughly the same size.
As an example, for a cluster with 200 OSDs and a pool size of 3
replicas, you would estimate your number of PGs as follows:
replicas, you would estimate your number of PGs as follows::
(200 * 100)
----------- = 6667. Nearest power of 2: 8192