Add documentation for generic volume groups
This patch adds documentation for generic volume groups. The cinder blueprint is here: https://blueprints.launchpad.net/cinder/+spec/generic-volume-group Change-Id: If556228f93f1da110c5e8327f5ad02951b93bbe4 Closes-Bug: #1617426
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doc/admin-guide/source/blockstorage-groups.rst
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doc/admin-guide/source/blockstorage-groups.rst
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=====================
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Generic volume groups
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=====================
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Generic volume group support is available in OpenStack Block Storage (cinder)
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since the Newton release. The support is added for creating group types and
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group specs, creating groups of volumes, and creating snapshots of groups.
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The group operations can be performed using the Block Storage command line.
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A group type is a type for a group just like a volume type for a volume.
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A group type can also have associated group specs similar to extra specs
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for a volume type.
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In cinder, there is a group construct called `consistency group`. Consistency
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groups only support consistent group snapshots and only a small number of
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drivers can support it. The following is a list of drivers that support
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consistency groups and the release when the support was added:
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- Juno: EMC VNX
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- Kilo: EMC VMAX, IBM (GPFS, Storwize, SVC, and XIV), ProphetStor, Pure
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- Liberty: Dell Storage Center, EMC XtremIO, HPE 3Par and LeftHand
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- Mitaka: EMC ScaleIO, NetApp Data ONTAP and E-Series, SolidFire
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- Newton: CoprHD, FalconStor, Huawei
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Consistency group cannot be extended easily to serve other purposes. A tenant
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may want to put volumes used in the same application together in a group so
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that it is easier to manage them together, and this group of volumes may or
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may not support consistent group snapshot. Generic volume group is introduced
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to solve this problem.
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There is a plan to migrate existing consistency group operations to use
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generic volume group operations in future releases. More information can be
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found in `Cinder specs <https://github.com/openstack/cinder-specs/blob/master/specs/newton/group-snapshots.rst>`_.
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.. note::
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Only Block Storage V3 API supports groups. You can
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specify :option:`--os-volume-api-version 3.x` when using the `cinder`
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command line for group operations where `3.x` contains a microversion value
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for that command. The generic volume group feature was completed in several
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patches. As a result, the minimum required microversion is different for
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group types, groups, and group snapshots APIs.
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The following group type operations are supported:
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- Create a group type.
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- Delete a group type.
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- Set group spec for a group type.
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- Unset group spec for a group type.
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- List group types.
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- Show a group type details.
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- Update a group.
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- List group types and group specs.
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The following group and group snapshot operations are supported:
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- Create a group, given group type and volume types.
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.. note::
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A group must have one group type. A group can support more than one
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volume type. The scheduler is responsible for finding a back end that
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can support the given group type and volume types.
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A group can only contain volumes hosted by the same back end.
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A group is empty upon its creation. Volumes need to be created and added
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to it later.
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- Show a group.
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- List groups.
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- Delete a group.
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- Modify a group.
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- Create a volume and add it to a group.
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- Create a snapshot for a group.
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- Show a group snapshot.
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- List group snapshots.
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- Delete a group snapshot.
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- Create a group from a group snapshot.
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- Create a group from a source group.
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The following operations are not allowed if a volume is in a group:
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- Volume migration.
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- Volume retype.
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- Volume deletion.
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.. note::
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A group has to be deleted as a whole with all the volumes.
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The following operations are not allowed if a volume snapshot is in a
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group snapshot:
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- Volume snapshot deletion.
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.. note::
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A group snapshot has to be deleted as a whole with all the volume
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snapshots.
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The details of group type operations are shown in the following. The minimum
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microversion to support group type and group specs is 3.11:
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**Create a group type**:
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.. code-block:: console
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cinder --os-volume-api-version 3.11 group-type-create
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[--description DESCRIPTION]
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[--is-public IS_PUBLIC]
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NAME
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.. note::
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The parameter ``NAME`` is required. The
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:option:`--is-public IS_PUBLIC` determines whether the group type is
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accessible to the public. It is ``True`` by default. By default, the
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policy on privileges for creating a group type is admin-only.
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**Show a group type**:
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.. code-block:: console
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cinder --os-volume-api-version 3.11 group-type-show
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GROUP_TYPE
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.. note::
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The parameter ``GROUP_TYPE`` is the name or UUID of a group type.
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**List group types**:
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.. code-block:: console
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cinder --os-volume-api-version 3.11 group-type-list
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.. note::
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Only admin can see private group types.
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**Update a group type**:
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.. code-block:: console
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cinder --os-volume-api-version 3.11 group-type-update
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[--name NAME]
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[--description DESCRIPTION]
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[--is-public IS_PUBLIC]
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GROUP_TYPE_ID
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.. note::
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The parameter ``GROUP_TYPE_ID`` is the UUID of a group type. By default,
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the policy on privileges for updating a group type is admin-only.
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**Delete group type or types**:
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.. code-block:: console
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cinder --os-volume-api-version 3.11 group-type-delete
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GROUP_TYPE [GROUP_TYPE ...]
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.. note::
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The parameter ``GROUP_TYPE`` is name or UUID of the group type or
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group types to be deleted. By default, the policy on privileges for
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deleting a group type is admin-only.
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**Set or unset group spec for a group type**:
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.. code-block:: console
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cinder --os-volume-api-version 3.11 group-type-key
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GROUP_TYPE ACTION KEY=VALUE [KEY=VALUE ...]
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.. note::
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The parameter ``GROUP_TYPE`` is the name or UUID of a group type. Valid
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values for the parameter ``ACTION`` are ``set`` or ``unset``.
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``KEY=VALUE`` is the group specs key and value pair to set or unset.
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For unset, specify only the key. By default, the policy on privileges
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for setting or unsetting group specs key is admin-only.
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**List group types and group specs**:
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.. code-block:: console
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cinder --os-volume-api-version 3.11 group-specs-list
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.. note::
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By default, the policy on privileges for seeing group specs is admin-only.
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The details of group operations are shown in the following. The minimum
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microversion to support groups operations is 3.13.
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**Create a group**:
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.. code-block:: console
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cinder --os-volume-api-version 3.13 group-create
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[--name NAME]
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[--description DESCRIPTION]
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[--availability-zone AVAILABILITY_ZONE]
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GROUP_TYPE VOLUME_TYPES
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.. note::
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The parameters ``GROUP_TYPE`` and ``VOLUME_TYPES`` are required.
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``GROUP_TYPE`` is the name or UUID of a group type. ``VOLUME_TYPES``
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can be a list of names or UUIDs of volume types separated by commas
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without spaces in between. For example,
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``volumetype1,volumetype2,volumetype3.``.
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**Show a group**:
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.. code-block:: console
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cinder --os-volume-api-version 3.13 group-show
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GROUP
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.. note::
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The parameter ``GROUP`` is the name or UUID of a group.
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**List groups**:
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.. code-block:: console
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cinder --os-volume-api-version 3.13 group-list
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[--all-tenants [<0|1>]]
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.. note::
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:option:`--all-tenants` specifies whether to list groups for all tenants.
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Only admin can use this option.
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**Create a volume and add it to a group**:
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.. code-block:: console
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cinder --os-volume-api-version 3.13 create
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--volume-type VOLUME_TYPE
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--group-id GROUP_ID SIZE
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.. note::
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When creating a volume and adding it to a group, the parameters
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``VOLUME_TYPE`` and ``GROUP_ID`` must be provided. This is because a group
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can support more than one volume type.
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**Delete a group**:
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.. code-block:: console
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cinder --os-volume-api-version 3.13 group-delete
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[--delete-volumes]
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GROUP [GROUP ...]
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.. note::
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:option:`--delete-volumes` allows or disallows groups to be deleted
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if they are not empty. If the group is empty, it can be deleted without
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:option:`--delete-volumes`. If the group is not empty, the flag is
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required for it to be deleted. When the flag is specified, the group
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and all volumes in the group will be deleted.
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**Modify a group**:
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.. code-block:: console
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cinder --os-volume-api-version 3.13 group-update
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[--name NAME]
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[--description DESCRIPTION]
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[--add-volumes UUID1,UUID2,......]
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[--remove-volumes UUID3,UUID4,......]
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GROUP
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.. note::
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The parameter ``UUID1,UUID2,......`` is the UUID of one or more volumes
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to be added to the group, separated by commas. Similarly the parameter
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``UUID3,UUID4,......`` is the UUID of one or more volumes to be removed
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from the group, separated by commas.
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The details of group snapshots operations are shown in the following. The
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minimum microversion to support group snapshots operations is 3.14.
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**Create a snapshot for a group**:
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.. code-block:: console
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cinder --os-volume-api-version 3.14 group-snapshot-create
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[--name NAME]
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[--description DESCRIPTION]
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GROUP
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.. note::
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The parameter ``GROUP`` is the name or UUID of a group.
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**Show a group snapshot**:
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.. code-block:: console
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cinder --os-volume-api-version 3.14 group-snapshot-show
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GROUP_SNAPSHOT
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.. note::
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The parameter ``GROUP_SNAPSHOT`` is the name or UUID of a group snapshot.
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**List group snapshots**:
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.. code-block:: console
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cinder --os-volume-api-version 3.14 group-snapshot-list
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[--all-tenants [<0|1>]]
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[--status STATUS]
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[--group-id GROUP_ID]
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.. note::
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:option:`--all-tenants` specifies whether to list group snapshots for
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all tenants. Only admin can use this option. :option:`--status STATUS`
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filters results by a status. :option:`--group-id GROUP_ID` filters
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results by a group id.
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**Delete group snapshot**:
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.. code-block:: console
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cinder --os-volume-api-version 3.14 group-snapshot-delete
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GROUP_SNAPSHOT [GROUP_SNAPSHOT ...]
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.. note::
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The parameter ``GROUP_SNAPSHOT`` specifies the name or UUID of one or more
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group snapshots to be deleted.
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**Create a group from a group snapshot or a source group**:
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.. code-block:: console
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$ cinder --os-volume-api-version 3.14 group-create-from-src
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[--group-snapshot GROUP_SNAPSHOT]
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[--source-group SOURCE_GROUP]
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[--name NAME]
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[--description DESCRIPTION]
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.. note::
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The parameter ``GROUP_SNAPSHOT`` is a name or UUID of a group snapshot.
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The parameter ``SOURCE_GROUP`` is a name or UUID of a source group.
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Either ``GROUP_SNAPSHOT`` or ``SOURCE_GROUP`` must be specified, but not
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both.
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@ -73,3 +73,4 @@ troubleshoot your installation and back up your Compute volumes.
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blockstorage-image-volume-cache.rst
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blockstorage-volume-backed-image.rst
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blockstorage-get-capabilities.rst
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blockstorage-groups.rst
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