How to prevent a Ceph cluster from automatically replicating data to other OSDs, while removing one of the OSDs manually.

Solution Verified - Updated -

Issue

  • An OSD disk was found faulty and needs to be removed from the Ceph cluster, to be replaced by a new disk.
  • How can I prevent a Ceph cluster from automatically replicating data to other OSDs, while removing one of the OSDs manually?

  • While removing the problematic disk, the Ceph cluster will automatically create replicas of the objects onto other OSDs depending on the value set for 'osd_pool_default_size' in /etc/ceph/ceph.conf. This creates additional traffic/IO which is better avoided, since a new OSD is set to be added and the replica is better done to the new disk.

  • In such a case, how can the automatic replication be stopped?

Environment

  • Red Hat Ceph Enterprise 1.3
  • Red Hat Ceph Enterprise 1.2.3

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