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Chapter 36. ISA erasure code plugin

The isa plugin is encapsulates the ISA library. It only runs on Intel processors.

To create a new jerasure 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]
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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 or 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.
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