manila/doc/source/admin/shared-file-systems-snapshots.rst

Share snapshots

The Shared File Systems service provides a snapshot mechanism to help users restore data by running the manila snapshot-create command.

To export a snapshot, create a share from it, then mount the new share to an instance. Copy files from the attached share into the archive.

To import a snapshot, create a new share with appropriate size, attach it to instance, and then copy a file from the archive to the attached file system.

Note

You cannot delete a share while it has saved dependent snapshots.

Create a snapshot from the share:

$ manila snapshot-create Share1 --name Snapshot1 --description "Snapshot of Share1"
+-------------+--------------------------------------+
| Property    | Value                                |
+-------------+--------------------------------------+
| status      | creating                             |
| share_id    | aca648eb-8c03-4394-a5cc-755066b7eb66 |
| user_id     | 5c7bdb6eb0504d54a619acf8375c08ce     |
| description | Snapshot of Share1                   |
| created_at  | 2015-09-25T05:27:38.000000           |
| size        | 1                                    |
| share_proto | NFS                                  |
| id          | 962e8126-35c3-47bb-8c00-f0ee37f42ddd |
| project_id  | cadd7139bc3148b8973df097c0911016     |
| share_size  | 1                                    |
| name        | Snapshot1                            |
+-------------+--------------------------------------+

Update snapshot name or description if needed:

$ manila snapshot-rename Snapshot1 Snapshot_1 --description "Snapshot of Share1. Updated."

Check that status of a snapshot is available:

$ manila snapshot-show Snapshot1
+-------------+--------------------------------------+
| Property    | Value                                |
+-------------+--------------------------------------+
| status      | available                            |
| share_id    | aca648eb-8c03-4394-a5cc-755066b7eb66 |
| user_id     | 5c7bdb6eb0504d54a619acf8375c08ce     |
| name        | Snapshot1                            |
| created_at  | 2015-09-25T05:27:38.000000           |
| share_proto | NFS                                  |
| id          | 962e8126-35c3-47bb-8c00-f0ee37f42ddd |
| project_id  | cadd7139bc3148b8973df097c0911016     |
| size        | 1                                    |
| share_size  | 1                                    |
| description | Snapshot of Share1                   |
+-------------+--------------------------------------+

To create a copy of your data from a snapshot, use manila create with key --snapshot-id. This creates a new share from an existing snapshot. Create a share from a snapshot and check whether it is available:

$ manila create nfs 1 --name Share2 --metadata source=snapshot --description "Share from a snapshot." --snapshot-id 962e8126-35c3-47bb-8c00-f0ee37f42ddd
+-----------------------------+--------------------------------------+
| Property                    | Value                                |
+-----------------------------+--------------------------------------+
| status                      | None                                 |
| share_type_name             | default                              |
| description                 | Share from a snapshot.               |
| availability_zone           | None                                 |
| share_network_id            | None                                 |
| export_locations            | []                                   |
| share_server_id             | None                                 |
| share_group_id              | None                                 |
| host                        | None                                 |
| snapshot_id                 | 962e8126-35c3-47bb-8c00-f0ee37f42ddd |
| is_public                   | False                                |
| task_state                  | None                                 |
| snapshot_support            | True                                 |
| id                          | b6b0617c-ea51-4450-848e-e7cff69238c7 |
| size                        | 1                                    |
| name                        | Share2                               |
| share_type                  | c0086582-30a6-4060-b096-a42ec9d66b86 |
| created_at                  | 2015-09-25T06:25:50.240417           |
| export_location             | None                                 |
| share_proto                 | NFS                                  |
| project_id                  | 20787a7ba11946adad976463b57d8a2f     |
| metadata                    | {u'source': u'snapshot'}             |
+-----------------------------+--------------------------------------+

$ manila show Share2
+-----------------------------+-------------------------------------------+
| Property                    | Value                                     |
+-----------------------------+-------------------------------------------+
| status                      | available                                 |
| share_type_name             | default                                   |
| description                 | Share from a snapshot.                    |
| availability_zone           | nova                                      |
| share_network_id            | 5c3cbabb-f4da-465f-bc7f-fadbe047b85a      |
| export_locations            | 10.254.0.3:/shares/share-1dc2a471-3d47-...|
| share_server_id             | 41b7829d-7f6b-4c96-aea5-d106c2959961      |
| share_group_id              | None                                      |
| host                        | manila@generic1#GENERIC1                  |
| snapshot_id                 | 962e8126-35c3-47bb-8c00-f0ee37f42ddd      |
| is_public                   | False                                     |
| task_state                  | None                                      |
| snapshot_support            | True                                      |
| id                          | b6b0617c-ea51-4450-848e-e7cff69238c7      |
| size                        | 1                                         |
| name                        | Share2                                    |
| share_type                  | c0086582-30a6-4060-b096-a42ec9d66b86      |
| created_at                  | 2015-09-25T06:25:50.000000                |
| share_proto                 | NFS                                       |
| project_id                  | 20787a7ba11946adad976463b57d8a2f          |
| metadata                    | {u'source': u'snapshot'}                  |
+-----------------------------+-------------------------------------------+

By default, the Shared File Systems service will place the new share in the source share's pool, unless a different destination availability zone is provided by the user, using the key --availability-zone.

Starting from Ussuri release, a new filter and weigher were added to the scheduler to enhance the selection of a destination pool when creating shares from snapshot. Drivers that support creating shares from snapshots across back ends also need the back end configuration option replication_domain to be specified. This option can be an arbitrary string. As an administrator, you are expected to determine which back ends are compatible to copy data between each other. Once you have identified these back ends, configure replication_domain in their respective configuration sections to the same string. Refer to the feature support mapping <share_back_ends_feature_support_mapping> for identifying which back ends support this feature. The use of scheduler when creating share from a snapshot must be enabled using the configuration flag [DEFAULT]/use_scheduler_creating_share_from_snapshot. This option is disabled by default.

Note

When combining both --snapshot-id and --availability-zone keys, you'll need to make sure that the configuration flag [DEFAULT]/use_scheduler_creating_share_from_snapshot is enabled, or the operation will be denied when source and destination availability zones are different.

You can soft-delete a snapshot using manila snapshot-delete <snapshot_name_or_ID>. If a snapshot is in busy state, and during the delete an error_deleting status appeared, administrator can force-delete it or explicitly reset the state.

Use snapshot-reset-state [--state <state>] <snapshot> to update the state of a snapshot explicitly. A valid value of a status are available, error, creating, deleting, error_deleting. If no state is provided, the available state will be used.

Use manila snapshot-force-delete <snapshot> to force-delete a specified share snapshot in any state.