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Clarify journal size based on filestore max sync

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The docs had the recommended journal size based on the option
"filestore min sync interval" when it should have been
"filestore max sync interval".

While in there, fix a couple of typos -- multiple when it should
be multiply, and a missing word.  Change "Should at least twice"
to "Should be at least twice..."

Signed-off-by: Travis Rhoden <trhoden@gmail.com>
This commit is contained in:
Travis Rhoden 2013-01-18 22:26:07 -05:00
parent 0cb760f31b
commit 48308954cb
2 changed files with 3 additions and 3 deletions
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4
doc/rados/configuration/ceph-conf.rst
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@ -386,10 +386,10 @@ journal data (e.g., a solid state drive delivers high performance journaling).
Ceph's default ``osd journal size`` is 0, so you will need to set this in your
``ceph.conf`` file. A journal size should find the product of the ``filestore
min sync interval`` and the expected throughput, and multiple the product by
max sync interval`` and the expected throughput, and multiply the product by
two (2)::
osd journal size = {2 * (expected throughput * filestore min sync interval)}
osd journal size = {2 * (expected throughput * filestore max sync interval)}
The expected throughput number should include the expected disk throughput
(i.e., sustained data transfer rate), and network throughput. For example,

2
doc/rados/configuration/osd-config-ref.rst
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@ -30,7 +30,7 @@
:Description: The size of the journal in megabytes. If this is 0, and the journal is a block device, the entire block device is used. Since v0.54, this is ignored if the journal is a block device, and the entire block device is used.
:Type: 32-bit Integer
:Default: ``1024``
:Recommended: Begin with 1GB. Should at least twice the product of the expected speed multiplied by ``filestore min sync interval``.
:Recommended: Begin with 1GB. Should be at least twice the product of the expected speed multiplied by ``filestore max sync interval``.
``osd max write size``