why not enable ceph-osd@<id> for ceph-volume lvm

[Dan van der Ster <dan@xxxxxxxxxxxxxx>]

Hi Alfredo,

Why don't we enable the ceph-osd@<id> service during ceph-volume lvm activation?

ceph_volume/devices/lvm/activate.py:

    if no_systemd is False:
        # enable the ceph-volume unit for this OSD
        systemctl.enable_volume(osd_id, osd_fsid, 'lvm')

        # start the OSD
        systemctl.start_osd(osd_id)

Because of this, the ceph-osd.target doesn't really work on lvm
activated machines:

# systemctl list-dependencies ceph-osd.target
ceph-osd.target
#

and once we stop osds with `systemctl stop ceph-osd.target`, they can
no longer be started, i.e. `systemctl start ceph-osd.target` does
nothing.

Cheers, Dan
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