ISA erasure code plugin

The isa plugin encapsulates the ISA 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 forms. If reed_sol_van is set, it is Vandermonde, if cauchy is set, it is Cauchy. 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.