Chapter 9. Troubleshooting clusters in stretch mode

Procedure

1. Force the stretch cluster into the recovery mode:

   Example

   [ceph: root@host01 /]#  ceph osd force_recovery_stretch_mode --yes-i-really-mean-it

   Copy to Clipboard Toggle word wrap

   Note

   The recovery state puts the cluster in the HEALTH_WARN state.

2. When in recovery mode, the cluster should go back into normal stretch mode after the placement groups are healthy. If that does not happen, you can force the stretch cluster into the healthy mode:

   Example

   [ceph: root@host01 /]#  ceph osd force_healthy_stretch_mode --yes-i-really-mean-it

   Copy to Clipboard Toggle word wrap

   Note

   You can also run this command if you want to force the cross-data-center peering early and you are willing to risk data downtime, or you have verified separately that all the placement groups can peer, even if they are not fully recovered.

   You might also wish to invoke the healthy mode to remove the HEALTH_WARN state, which is generated by the recovery state.

   Note

   The force_recovery_stretch_mode and force_recovery_healthy_mode commands should not be necessary, as they are included in the process of managing unanticipated situations.