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doc/bdev: document bdev_null

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Change-Id: I5b48e798b0540ef7fbc99699ebf6dc913c075b44
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-on: https://review.gerrithub.io/376861
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Paul Luse <paul.e.luse@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
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Daniel Verkamp 2017-09-01 16:27:28 -07:00 committed by Jim Harris
parent 744a785b76
commit 7fc4405c5d
1 changed files with 15 additions and 0 deletions
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doc/bdev.md
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@ -57,6 +57,21 @@ Configuration file syntax:
This exports 4 malloc block devices, named Malloc0 through Malloc3. Each malloc block device will This exports 4 malloc block devices, named Malloc0 through Malloc3. Each malloc block device will
be 64MB in size. be 64MB in size.
## Null {#bdev_config_null}
The SPDK null bdev driver is a dummy block I/O target that discards all writes and returns undefined
data for reads. It is useful for benchmarking the rest of the bdev I/O stack with minimal block
device overhead and for testing configurations that can't easily be created with the Malloc bdev.
Configuration file syntax:
~~~
[Null]
# Dev <name> <size_in_MiB> <block_size>
# Create an 8 petabyte null bdev with 4K block size called Null0
Dev Null0 8589934592 4096
~~~
## Linux AIO {#bdev_config_aio} ## Linux AIO {#bdev_config_aio}
The SPDK aio bdev driver provides SPDK block layer access to Linux kernel block devices via Linux AIO. The SPDK aio bdev driver provides SPDK block layer access to Linux kernel block devices via Linux AIO.