Adding OSDs
OSDs are added via a new ceph-osd unit. The unit’s underlying machine is understood to house one or more storage devices.
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Ensure that the cluster is in a healthy state. On any MON (such as the leader unit here) run a status check:
juju ssh ceph-mon/leader sudo ceph status -
Add a ceph-osd unit:
juju add-unit ceph-osd
A specific underlying machine (MAAS node) can be chosen via Juju constraints.
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If the new unit’s machine has disks that are not listed by the ceph-osd charm’s osd-devices configuration option then the add-disk action should be used to manually add OSD volumes:
juju run --wait ceph-osd/5 add-disk osd-devices=/dev/sde
Note:
For Juju versions < 3.0, use the juju run-action command.
Alternatively, update the value of the osd-devices option:
juju config ceph-osd osd-devices='/dev/sdb /dev/sdc /dev/sde'
Note:
An existing OSD cannot be removed from the cluster by mistakenly omitting it from the updated value of option osd-devices.