Changing the storage policy for volumes

If you use redundancy by replication for a compute volume, you can update the chosen redundancy scheme by changing the storage policy. With redundancy by erasure coding, however, changing the redundancy scheme applied to the volume is disabled. The storage policy can only be changed for available volumes, that is, volumes not attached to any virtual machines.

Limitations

You cannot change the volume redundancy type. And thus, you can apply another storage policy only within the same redundancy type. For example, the storage policy with 3 replicas can only be changed to the storage policy with 2 replicas or 1 replica (no redundancy).
Changing the storage policy with the erasure coding redundancy type is disabled.
You cannot change the storage policy of a volume with the "In use" status.

Prerequisites

A clear understanding of the concept Storage policies.
A volume is created, as described in Creating and deleting volumes.

To change the storage policy of a volume

Admin panel

On the Compute > Storage > Volumes tab, click a volume.
Click the pencil icon in the Storage policy field.
Select a new storage policy, and then click the tick icon. You can choose only between storage policies with the replication redundancy type.

Command-line interface

Use the following command:

vinfra service compute volume set --storage-policy <storage_policy> <volume>

--storage-policy <storage_policy>: Storage policy ID or name
<volume>: Volume ID or name

For example, to change the storage policy of the volume myvolume to mystorpolicy, run:

# vinfra service compute volume set myvolume --storage-policy mystorpolicy
+--------------------------------+------------------------------------------+
| Field                          | Value                                    |
+--------------------------------+------------------------------------------+
| attachments                    | []                                       |
| availability_zone              | nova                                     |
| bootable                       | False                                    |
| consistencygroup_id            |                                          |
| created_at                     | 2018-09-12T12:30:12.665916               |
| description                    |                                          |
| encrypted                      | False                                    |
| id                             | c9c0e9e7-ce7a-4566-99d5-d7e40f2987ab     |
| imageRef                       |                                          |
| migration_status               |                                          |
| multiattach                    | False                                    |
| name                           | myvolume                                 |
| network_install                | False                                    |
| os-vol-host-attr:host          | node001.vstoragedomain@vstorage#vstorage |
| os-vol-mig-status-attr:migstat |                                          |
| os-vol-mig-status-attr:name_id |                                          |
| project_id                     | 72a5db3a033c403a86756021e601ef34         |
| replication_status             |                                          |
| size                           | 8                                        |
| snapshot_id                    |                                          |
| source_volid                   |                                          |
| status                         | available                                |
| storage_policy_name            | mystorpolicy                             |
| updated_at                     | 2018-09-12T12:55:29.298717               |
| user_id                        | 98bf389983c24c07af9677b931783143         |
| volume_image_metadata          |                                          |
+--------------------------------+------------------------------------------+