How to pause/stop rebalance in Ceph?

Solution Verified - Updated

Environment

  • Red Hat Ceph Storage 1.3.x
  • Red Hat Ceph Storage 2.x

Issue

  • How to pause/stop re-balance in Ceph?

  • Is it possible to stop an on-going re-balance operation in a Ceph cluster?

Resolution

  • To stop an ongoing re-balance, set the norebalance flag. 

    # ceph osd set norebalance

  • To resume the rebalance , unset the norebalance flag.

    # ceph osd unset norebalance

NOTE:
>* The re-balance operation happens in (osd_recovery_max_chunk x osd_recovery_max_active) chunks.
>* If a re-balance process is going on and a norebalance flag is set, the ongoing chunk is re-balanced and a new one is not allowed to kick in.

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