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[stor4nfv.git] / src / ceph / doc / rados / operations / erasure-code-jerasure.rst

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-============================
-Jerasure erasure code plugin
-============================
-
-The *jerasure* plugin is the most generic and flexible plugin, it is
-also the default for Ceph erasure coded pools. 
-
-The *jerasure* plugin encapsulates the `Jerasure
-<http://jerasure.org>`_ library. It is
-recommended to read the *jerasure* documentation to get a better
-understanding of the parameters.
-
-Create a jerasure profile
-=========================
-
-To create a new *jerasure* erasure code profile::
-
-        ceph osd erasure-code-profile set {name} \
-             plugin=jerasure \
-             k={data-chunks} \
-             m={coding-chunks} \
-             technique={reed_sol_van|reed_sol_r6_op|cauchy_orig|cauchy_good|liberation|blaum_roth|liber8tion} \
-             [crush-root={root}] \
-             [crush-failure-domain={bucket-type}] \
-             [crush-device-class={device-class}] \
-             [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: Yes.
-:Example: 4
-
-``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: Yes.
-:Example: 2
-
-``technique={reed_sol_van|reed_sol_r6_op|cauchy_orig|cauchy_good|liberation|blaum_roth|liber8tion}``
-
-:Description: The more flexible technique is *reed_sol_van* : it is
-              enough to set *k* and *m*. The *cauchy_good* technique
-              can be faster but you need to chose the *packetsize*
-              carefully. All of *reed_sol_r6_op*, *liberation*,
-              *blaum_roth*, *liber8tion* are *RAID6* equivalents in
-              the sense that they can only be configured with *m=2*. 
-
-:Type: String
-:Required: No.
-:Default: reed_sol_van
-
-``packetsize={bytes}``
-
-:Description: The encoding will be done on packets of *bytes* size at
-              a time. Chosing the right packet size is difficult. The
-              *jerasure* documentation contains extensive information
-              on this topic.
-
-:Type: Integer
-:Required: No.
-:Default: 2048
-
-``crush-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
-
-``crush-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
-
-``crush-device-class={device-class}``
-
-:Description: Restrict placement to devices of a specific class (e.g.,
-              ``ssd`` or ``hdd``), using the crush device class names
-              in the CRUSH map.
-
-:Type: String
-:Required: No.
-:Default:
-
- ``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.
-