Alert rule: CephDeviceFailurePredicted

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The device health module has determined that one or more devices will fail soon.

Steps for debugging

  1. Check which OSD is failing.

    $ ceph_cluster_ns=syn-rook-ceph-cluster
    # Show life expectancy of the OSD
    $ kubectl -n ${ceph_cluster_ns} exec -it deploy/rook-ceph-tools -- ceph device ls
  2. If usage is high, or you have three or less OSDs, you may need to add new OSDs to the cluster.

    $ ceph_cluster_ns=syn-rook-ceph-cluster
    # Show amount of active OSDs
    $ kubectl -n ${ceph_cluster_ns} exec -it deploy/rook-ceph-tools -- ceph osd stat
    # Show available space in cluster
    ka -n ${ceph_cluster_ns} exec -it deploy/rook-ceph-tools -- ceph pg stat
  3. Mark the OSD as out, so data may migrate to other OSDs in the cluster.

    $ ceph_cluster_ns=syn-rook-ceph-cluster
    $ kubectl -n ${ceph_cluster_ns} exec -it deploy/rook-ceph-tools -- ceph osd out <osd id>