mirror of
https://github.com/ceph/ceph
synced 2024-12-20 02:13:04 +00:00
95 lines
2.5 KiB
ReStructuredText
95 lines
2.5 KiB
ReStructuredText
=======================
|
|
ISA erasure code plugin
|
|
=======================
|
|
|
|
The *isa* plugin encapsulates the `ISA
|
|
<https://01.org/intel%C2%AE-storage-acceleration-library-open-source-version/>`_
|
|
library. It only runs on Intel processors.
|
|
|
|
Create an isa profile
|
|
=====================
|
|
|
|
To create a new *isa* erasure code profile::
|
|
|
|
ceph osd erasure-code-profile set {name} \
|
|
plugin=isa \
|
|
technique={reed_sol_van|cauchy} \
|
|
[k={data-chunks}] \
|
|
[m={coding-chunks}] \
|
|
[ruleset-root={root}] \
|
|
[ruleset-failure-domain={bucket-type}] \
|
|
[directory={directory}] \
|
|
[--force]
|
|
|
|
Where:
|
|
|
|
``k={data chunks}``
|
|
|
|
:Description: Each object is split in **data-chunks** parts,
|
|
each stored on a different OSD.
|
|
|
|
:Type: Integer
|
|
:Required: No.
|
|
:Default: 7
|
|
|
|
``m={coding-chunks}``
|
|
|
|
:Description: Compute **coding chunks** for each object and store them
|
|
on different OSDs. The number of coding chunks is also
|
|
the number of OSDs that can be down without losing data.
|
|
|
|
:Type: Integer
|
|
:Required: No.
|
|
:Default: 3
|
|
|
|
``technique={reed_sol_van|cauchy}``
|
|
|
|
:Description: The ISA plugin comes in two `Reed Solomon
|
|
<https://en.wikipedia.org/wiki/Reed%E2%80%93Solomon_error_correction>`_
|
|
forms. If *reed_sol_van* is set, it is `Vandermonde
|
|
<https://en.wikipedia.org/wiki/Vandermonde_matrix>`_, if
|
|
*cauchy* is set, it is `Cauchy
|
|
<https://en.wikipedia.org/wiki/Cauchy_matrix>`_.
|
|
|
|
:Type: String
|
|
:Required: No.
|
|
:Default: reed_sol_van
|
|
|
|
``ruleset-root={root}``
|
|
|
|
:Description: The name of the crush bucket used for the first step of
|
|
the ruleset. For intance **step take default**.
|
|
|
|
:Type: String
|
|
:Required: No.
|
|
:Default: default
|
|
|
|
``ruleset-failure-domain={bucket-type}``
|
|
|
|
:Description: Ensure that no two chunks are in a bucket with the same
|
|
failure domain. For instance, if the failure domain is
|
|
**host** no two chunks will be stored on the same
|
|
host. It is used to create a ruleset step such as **step
|
|
chooseleaf host**.
|
|
|
|
:Type: String
|
|
:Required: No.
|
|
:Default: host
|
|
|
|
``directory={directory}``
|
|
|
|
:Description: Set the **directory** name from which the erasure code
|
|
plugin is loaded.
|
|
|
|
:Type: String
|
|
:Required: No.
|
|
:Default: /usr/lib/ceph/erasure-code
|
|
|
|
``--force``
|
|
|
|
:Description: Override an existing profile by the same name.
|
|
|
|
:Type: String
|
|
:Required: No.
|
|
|