doc: Change default erasure code profile from jerasure to isa

Signed-off-by: Jamie Pryde <[email protected]>

Author: jamiepryde

doc/dev/erasure-coded-pool.rst

@@ -63,7 +63,7 @@ Set the CRUSH failure domain to osd (instead of host, which is the default)::
  $ ceph osd erasure-code-profile get myprofile
  k=2
  m=2
- plugin=jerasure
+ plugin=isa
  technique=reed_sol_van
  crush-failure-domain=osd
  $ ceph osd pool create ecpool erasure myprofile
@@ -75,7 +75,7 @@ Control the parameters of the erasure code plugin::
  $ ceph osd erasure-code-profile get myprofile
  k=3
  m=2
- plugin=jerasure
+ plugin=isa
  technique=reed_sol_van
  $ ceph osd pool create ecpool erasure myprofile
 
@@ -98,7 +98,7 @@ Display the default erasure code profile::
   $ ceph osd erasure-code-profile get default
   k=2
   m=2
-  plugin=jerasure
+  plugin=isa
   technique=reed_sol_van
 
 Create a profile to set the data to be distributed on six OSDs (k+m=6) and sustain the loss of three OSDs (m=3) without losing data::
@@ -107,7 +107,7 @@ Create a profile to set the data to be distributed on six OSDs (k+m=6) and susta
   $ ceph osd erasure-code-profile get myprofile
   k=3
   m=3
-  plugin=jerasure
+  plugin=isa
   technique=reed_sol_van
   $ ceph osd erasure-code-profile ls
   default
@@ -129,7 +129,7 @@ Set the rule to ssd (instead of default)::
  $ ceph osd erasure-code-profile get myprofile
  k=2
  m=2
- plugin=jerasure
+ plugin=isa
  technique=reed_sol_van
  crush-root=ssd
 

doc/dev/osd_internals/erasure_coding/developer_notes.rst

@@ -171,7 +171,7 @@ key=value pairs stored in an `erasure code profile`_.
  directory=/usr/lib/ceph/erasure-code
  k=2
  m=1
- plugin=jerasure
+ plugin=isa
  technique=reed_sol_van
  crush-failure-domain=osd
  $ ceph osd pool create ecpool erasure myprofile
@@ -206,7 +206,7 @@ set in the erasure code profile, before the pool was created.
  
   ceph osd erasure-code-profile set myprofile \
      directory=<dir>         \ # mandatory
-     plugin=jerasure         \ # mandatory
+     plugin=isa              \ # mandatory
      m=10                    \ # optional and plugin dependent
      k=3                     \ # optional and plugin dependent
      technique=reed_sol_van  \ # optional and plugin dependent

doc/rados/operations/erasure-code-isa.rst

@@ -2,6 +2,7 @@
 ISA erasure code plugin
 =======================
 
+The *isa* plugin is the default for Ceph erasure coded pools.
 The *isa* plugin encapsulates the `ISA
 <https://01.org/intel%C2%AE-storage-acceleration-library-open-source-version/>`_
 library.

doc/rados/operations/erasure-code-jerasure.rst

@@ -2,8 +2,10 @@
 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 is a generic and flexible plugin. However,
+the *jerasure* library is no longer maintained and has not been
+updated to support modern CPU instructions that can improve
+performance when encoding and decoding data.
 
 The *jerasure* plugin encapsulates the `Jerasure
 <https://github.com/ceph/jerasure>`_ library. It is

doc/rados/operations/erasure-code-profile.rst

@@ -67,7 +67,7 @@ Where:
 
 :Type: String
 :Required: No.
-:Default: jerasure
+:Default: isa
 
 ``{stripe_unit=stripe_unit}``
 

doc/rados/operations/erasure-code.rst

@@ -64,7 +64,7 @@ profile can be displayed with this command:
 
    k=2
    m=2
-   plugin=jerasure
+   plugin=isa
    crush-failure-domain=host
    technique=reed_sol_van