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Merge pull request #17654 from yuyuyu101/wip-spdk-doc

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doc/bluestore: add SPDK usage for bluestore

Reviewed-by: Sage Weil <sage@redhat.com>
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Sage Weil 2017-09-12 18:56:25 -05:00 committed by GitHub
commit 25ba984310
1 changed files with 30 additions and 0 deletions
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doc/rados/configuration/bluestore-config-ref.rst
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@ -294,3 +294,33 @@ set with::
:Type: Unsigned Integer
:Required: No
:Default: 64K
SPDK Usage
==================
If you want to use SPDK driver for NVME SSD, you need to specify NVMe serial
number here with "spdk:" prefix for ``bluestore_block_path``.
For example, users can find the serial number with::
$ lspci -vvv -d 8086:0953 | grep "Device Serial Number"
and then set::
bluestore block path = spdk:...
If you want to run multiple SPDK instances per node, you must specify the
amount of dpdk memory size in MB each instance will use, to make sure each
instance uses its own dpdk memory
In most cases, we only need one device to serve as data, db, db wal purposes.
We need to make sure configurations below to make sure all IOs issued under
SPDK.::
bluestore_block_db_path = ""
bluestore_block_db_size = 0
bluestore_block_wal_path = ""
bluestore_block_wal_size = 0
Otherwise, the current implementation will setup symbol file to kernel
filesystem location and uses kernel driver to issue DB/WAL IO.