simple
Implements the functionality needed to manage OSDs from the simple subcommand:
ceph-volume simple
Command Line Subcommands
By taking over management, it disables all ceph-disk systemd units used
to trigger devices at startup, relying on basic (customizable) JSON
configuration and systemd for starting up OSDs.
This process involves two steps:
The scanning will infer everything that ceph-volume needs to start the OSD,
so that when activation is needed, the OSD can start normally without getting
interference from ceph-disk.
As part of the activation process the systemd units for ceph-disk in charge
of reacting to udev events, are linked to /dev/null so that they are
fully inactive.
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