Creating buckets in RHCS Rados Object Gateway on Erasure Coded pools fails with an HTTP 500 error.

Solution Verified - Updated

Environment

  • Red Hat Ceph Storage 1.3.x

  • Red Hat Ceph Storage 2.x

Issue

  • Creating buckets in radosgw with erasure coding pools fails with error
WARNING: set_req_state_err err_no=95 resorting to 500
req 388:0.015874:s3:PUT /MYTEST/:create_bucket:http status=500

Resolution

  • The best approach for using EC pools with RGW is to configure the .rgw.buckets pool as Erasure Coded while other RGW pools are kept as Replicated.

  • .rgw.buckets is the only data pool in RGW that is supported in Erasure Coded format.

  • This is due to the fact that the remaining RGW pools need omap support for proper functioning and EC pools do not support omap operations.

  • Read more on this at the RHCS Storage Strategies guide:

This content is not included.RHCS1.3 Erasure Coded pools

This content is not included.RHCS2.x Erasure Coded pools.

Root Cause

  • Erasure Coded pools do not support omap operations, which are needed for almost all the pools used in RGW.

Diagnostic Steps

  • radosgw.log logs an HTTP 500 error
WARNING: set_req_state_err err_no=95 resorting to 500
req 388:0.015874:s3:PUT /MYTEST/:create_bucket:http status=500
  • err_no=95 translates to Operation not supported on transport endpoint.
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