To manage a share snapshot means that an administrator,
rather than a share driver, manages the storage lifecycle. This approach
is appropriate when an administrator manages share snapshots outside of
the Shared File Systems service and wants to register it with the
service.

To unmanage a share snapshot means to unregister a
specified share snapshot from the Shared File Systems service.
Administrators can revert an unmanaged share snapshot to managed status
if needed.

Unmanage a share snapshot

The unmanage operation is not supported for shares that
were created on top of share servers and created with share networks.
The Share service should have the option
driver_handles_share_servers = False set in the
manila.conf file.

To unmanage managed share snapshot, run the manila snapshot-unmanage <share_snapshot>
command. Then try to print the information about the share snapshot. The
returned result should indicate that Shared File Systems service won’t
find the share snapshot:

$ manila snapshot-unmanage my_test_share_snapshot
$ manila snapshot-show my_test_share_snapshot
ERROR: No sharesnapshot with a name or ID of 'my_test_share_snapshot'
exists.

Manage a share snapshot

To register the non-managed share snapshot in the File System
service, run the manila snapshot-manage command:

manila snapshot-manage [--name <name>] [--description <description>]
              [--driver_options [<key=value> [<key=value> ...]]]
              <share> <provider_location>

The positional arguments are:

• share. Name or ID of the share.
• provider_location. Provider location of the share snapshot on the
  backend.

The driver_options is an optional set of one or more key
and value pairs that describe driver options.

To manage share snapshot, run:

$ manila snapshot-manage \
    9ba52cc6-c97e-4b40-8653-4bcbaaf9628d \
    4d1e2863-33dd-4243-bf39-f7354752097d \
    --name my_test_share_snapshot \
    --description "My test share snapshot" \
+-------------------+--------------------------------------+
| Property          | Value                                |
+-------------------+--------------------------------------+
| status            | manage_starting                      |
| share_id          | 9ba52cc6-c97e-4b40-8653-4bcbaaf9628d |
| user_id           | d9f4003655c94db5b16c591920be1f91     |
| description       | My test share snapshot               |
| created_at        | 2016-07-25T04:49:42.600980           |
| size              | None                                 |
| share_proto       | NFS                                  |
| provider_location | 4d1e2863-33dd-4243-bf39-f7354752097d |
| id                | 89c663b5-026d-45c7-a43b-56ef0ba0faab |
| project_id        | aaa33a0ca4324965a3e65ae47e864e94     |
| share_size        | 1                                    |
| name              | my_test_share_snapshot               |
+-------------------+--------------------------------------+

Check that the share snapshot is available:

$ manila snapshot-show my_test_share_snapshot
+-------------------+--------------------------------------+
| Property          | Value                                |
+-------------------+--------------------------------------+
| status            | available                            |
| share_id          | 9ba52cc6-c97e-4b40-8653-4bcbaaf9628d |
| user_id           | d9f4003655c94db5b16c591920be1f91     |
| description       | My test share snapshot               |
| created_at        | 2016-07-25T04:49:42.000000           |
| size              | 1                                    |
| share_proto       | NFS                                  |
| provider_location | 4d1e2863-33dd-4243-bf39-f7354752097d |
| id                | 89c663b5-026d-45c7-a43b-56ef0ba0faab |
| project_id        | aaa33a0ca4324965a3e65ae47e864e94     |
| share_size        | 1                                    |
| name              | my_test_share_snapshot               |
+-------------------+--------------------------------------+