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Element Software

CreateGroupSnapshot

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You can use CreateGroupSnapshot to create a point-in-time copy of a group of volumes.

You can use this snapshot later as a backup or rollback to ensure the data on the group of volumes is consistent for the point in time that you created the snapshot.

CLUSTER_FULLNESS

Note You can create snapshots if cluster fullness is at stage 1, 2, or 3. You cannot create snapshots when cluster fullness reaches stage 4 or 5.

Parameters

This method has the following input parameters:

Name Description Type Default value Required

attributes

List of name-value pairs in JSON object format.

JSON object

None

No

enableRemoteReplication

Specifies whether the snapshot will be replicated to remote storage or not. Possible values:

  • true: The snapshot will be replicated to remote storage.

  • false: The snapshot will not be replicated to remote storage.

boolean

false

No

ensureSerialCreation

Specifies that the snapshot should not be created if a previous snapshot replication is in progress. Possible values are:

  • true: This ensures that only one snapshot is being replicated at a time. The creation of a new snapshot will fail if a previous snapshot replication is still in progress.

  • false: Default. This snapshot creation is allowed if another snapshot replication is still in progress.

boolean

false

No

expirationTime

Specify the time after which the snapshot can be removed. Cannot be used with retention. If neither expirationTime, or retention are specified, the snapshot will not expire. The time format is an ISO 8601 date string for time based expiration, otherwise it will not expire. A value of null causes the snapshot to be retained permanently. A value of fifo causes the snapshot to be preserved on a First-In-First-Out (FIFO) basis, relative to other FIFO snapshots on the volume. The API will fail if no FIFO space is available.

ISO 8601 date string

None

No

name

The name of the group snapshot. If no name is entered, the date and time the group snapshot was taken is used. The maximum name length allowed is 255 characters.

string

None

No

retention

This parameter is same as the expirationTime parameter, except the time format is HH:mm:ss. If neither expirationTime nor retention are specified, the snapshot will not expire.

string

None

No

snapMirrorLabel

The label used by SnapMirror software to specify the snapshot retention policy on a SnapMirror endpoint.

string

None

No

volumes

Unique ID of the volume image from which to copy.

volumeID array

None

Yes

Return values

This method has the following return values:

Name

Description

Type

members

List of checksum, volumeIDs, and snapshotIDs for each member of the group. Valid values:

  • checksum: A small string representation of the data in the stored snapshot. This checksum can be used later to compare other snapshots to detect errors in the data. (string)

  • snapshotID: Unique ID of a snapshot from which the new snapshot is made. The snapshotID must be from a snapshot on the given volume. (integer)

  • volumeID: The source volume ID for the snapshot. (integer)

JSON object array

groupSnapshotID

Unique ID of the new group snapshot.

groupSnapshot ID

groupSnapshot

Object containing information about the newly created group snapshot.

groupSnapshot

Request example

Requests for this method are similar to the following example:

{
   "method": "CreateGroupSnapshot",
   "params": {
      "volumes": [1,2]
   },
   "id": 1
}

Response example

This method returns a response similar to the following example:

{
  "id": 1,
  "result": {
    "groupSnapshot": {
      "attributes": {},
      "createTime": "2016-04-04T22:43:29Z",
      "groupSnapshotID": 45,
      "groupSnapshotUUID": "473b78a3-ef85-4541-9438-077306b2d3ca",
      "members": [
        {
          "attributes": {},
          "checksum": "0x0",
          "createTime": "2016-04-04T22:43:29Z",
          "enableRemoteReplication": false,
          "expirationReason": "None",
          "expirationTime": null,
          "groupID": 45,
          "groupSnapshotUUID": "473b78a3-ef85-4541-9438-077306b2d3ca",
          "name": "2016-04-04T22:43:29Z",
          "snapshotID": 3323,
          "snapshotUUID": "7599f200-0092-4b41-b362-c431551937d1",
          "status": "done",
          "totalSize": 5000658944,
          "virtualVolumeID": null,
          "volumeID": 1
        },
        {
          "attributes": {},
          "checksum": "0x0",
          "createTime": "2016-04-04T22:43:29Z",
          "enableRemoteReplication": false,
          "expirationReason": "None",
          "expirationTime": null,
          "groupID": 45,
          "groupSnapshotUUID": "473b78a3-ef85-4541-9438-077306b2d3ca",
          "name": "2016-04-04T22:43:29Z",
          "snapshotID": 3324,
          "snapshotUUID": "a0776a48-4142-451f-84a6-5315dc37911b",
          "status": "done",
          "totalSize": 6001000448,
          "virtualVolumeID": null,
          "volumeID": 2
        }
      ],
      "name": "2016-04-04T22:43:29Z",
      "status": "done"
    },
    "groupSnapshotID": 45,
    "members": [
      {
        "checksum": "0x0",
        "snapshotID": 3323,
        "snapshotUUID": "7599f200-0092-4b41-b362-c431551937d1",
        "volumeID": 1
      },
      {
        "checksum": "0x0",
        "snapshotID": 3324,
        "snapshotUUID": "a0776a48-4142-451f-84a6-5315dc37911b",
        "volumeID": 2
      }
    ]
  }
}

New since version

9.6