What are the best practices for Erasure coded pools in Red Hat Ceph Storage?

Environment

• Red Hat Ceph Storage 1.3.x

• Red Hat Ceph Storage 2.x

Issue

• What are the best practises for the Erasure coded pools in Red Hat Ceph Storage?

Resolution

• Erasure-coded pools are only supported with RADOS Gateway (RGW).

NOTE

• Erasure coded pools do not support omap operations.

• RGW needs omap support to work properly, hence it is not possible to create RGW pools as EC pools and get it working.

• However, RGW do not need the omap feature on the .rgw.buckets pool, and hence it can be an EC pool.

• In case RGW pools are created as EC pools, make sure that only the .rgw.buckets pool is configured as EC, and the rest are configured as Replicated pools.

• Refer https://access.redhat.com/solutions/2262391 for more details.

• Using Erasure coded pools with a RADOS Block Device (RBD) is not supported.

• Read more on Erasure Coded pools at:

  This content is not included.RHCS1.3.x
  This content is not included.RHCS2.x

• RHCS supports Erasure Coded pools with different algorithms, also called Erasure Coded Plugins.

• Currently the only supported plugin is Jerasure. More information on this can be read in the This content is not included.RHCS Storage Strategies documentation

• The supported K/M values are:

    8+3
    8+4
    4+2
  

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