A forthcoming profile needs to set the I/O scheduler to noop/none on
disks backing ceph OSDs. Puppet needs to know which block devices those
are, which requires inspecting LVM PVs whose VG belongs to ceph.
- add ceph_osd_devices fact returning the sorted array of PV device
paths whose volume group name starts with ceph-
- confine the fact to physical Linux hosts that have pvs installed so it
never resolves on VMs
Claude-Session: https://claude.ai/code/session_01JUoARVdmhxKQHyyyp1pxeT