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doc/rados: Better block.db size recommendations for bluestore

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Signed-off-by: Neha Ojha <nojha@redhat.com>
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Neha 2019-12-12 22:04:57 +00:00
parent aa760fa501
commit 36cdafbcca
1 changed files with 5 additions and 3 deletions
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8
doc/rados/configuration/bluestore-config-ref.rst
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@ -127,9 +127,11 @@ When using a :ref:`mixed spinning and solid drive setup
``block.db`` logical volume for Bluestore. Generally, ``block.db`` should have
*as large as possible* logical volumes.
It is recommended that the ``block.db`` size isn't smaller than 4% of
``block``. For example, if the ``block`` size is 1TB, then ``block.db``
shouldn't be less than 40GB.
The general recommendation is to have ``block.db`` size in between 1% to 4%
of ``block`` size. For RGW workloads, it is recommended that the ``block.db``
size isn't smaller than 4% of ``block``, because RGW heavily uses it to store its
metadata. For example, if the ``block`` size is 1TB, then ``block.db`` shouldn't
be less than 40GB. For RBD workloads, 1% to 2% of ``block`` size is usually enough.
If *not* using a mix of fast and slow devices, it isn't required to create
separate logical volumes for ``block.db`` (or ``block.wal``). Bluestore will