James Page Ceph Osd Apparmor

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• pause

  CAUTION - Set the local osd units in the charm to 'out' but does not stop the osds. Unless the osd cluster is set to noout (see below), this removes them from the ceph cluster and forces ceph to migrate the PGs to other OSDs in the cluster. See the following.

  http://docs.ceph.com/docs/master/rados/operations/add-or-rm-osds/#removing-the-osd "Do not let your cluster reach its full ratio when removing an OSD. Removing OSDs could cause the cluster to reach or exceed its full ratio." Also note that for small clusters you may encounter the corner case where some PGs remain stuck in the active+remapped state. Refer to the above link on how to resolve this.

  pause-health (on a ceph-mon) unit can be used before pausing a ceph-osd unit to stop the cluster rebalancing the data off this ceph-osd unit. pause-health sets 'noout' on the cluster such that it will not try to rebalance the data accross the remaining units.

  It is up to the user of the charm to determine whether pause-health should be used as it depends on whether the osd is being paused for maintenance or to remove it from the cluster completely.

• replace-osd

  Replace a failed osd with a fresh disk

  Params

  • osd-number integer

    The osd number to operate on. Example 99. Hint you can get this information from ceph osd tree.

  • replacement-device string

    The replacement device to use. Example /dev/sdb.

  Required

  osd-number, replacement-device

• resume

  Set the local osd units in the charm to 'in'. Note that the pause option does NOT stop the osd processes.