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Ceph Nautilus now supports autoscaling of placement groups: http://docs.ceph.com/docs/master/rados/operations/placement-groups/#autoscaling-placement-groups

When creating or editing a Ceph pool, it should be possible to set the PG autoscaling mode, by allowing a selection box to choose between "on", "off" or "warn" - see the docs for details.

Also, each Pools autoscale status should be displayed when looking at a Pools's details.