Using snapshots

A snapshot is a copy of the volume's content at a particular point in time. You can use snapshots to protect against data loss. Snapshots are also useful for test environments. You can test data using the snapshot without changing the actual volume.

Create manual snapshots

To create snapshots of a volume, the snapshot capability must first be enabled. This is accomplished with the -s or --snapshot flag during volume creation:

$ cio volume create foo --snapshot yes
Succeed: Add vd2: Type:2-copy, Size:20GB

Enabling snapshots allows you to create a snapshot of a volume whenever you want by running:

$ cio snapshot create foo
Succeed: Created a snapshot of '/cio/vd2' in '/cio/vd2/.snap/2019-04-28-0345-053cc45e-0000002'

Create rotating snapshots

You can also create a volume that will snapshot at periodic intervals. The following example creates a volume which will snapshot every hour and keep a maximum of 10 most recent snapshots:

$ cio volume create foo --snapshot yes --interval 60 --snapshotMax 10
Succeed: Add vd2: Type:2-copy, Size:20G

With periodic snapshots, the oldest snapshot is automatically removed when the maximum number of snapshots is reached and a new snapshot created.

List snapshots

Snapshots of a volume can be listed using cio snapshot ls $volume_name:

$ cio snapshot ls vol
SNAPSHOT                           DATE                    DESCRIPTION
2019-04-28-1340-20b9b305-0000003   Sun Apr 28 13:40 2019   Rotating snapshot with auto cleanup
2019-04-28-1341-20b9b305-0000003   Sun Apr 28 13:41 2019   Rotating snapshot with auto cleanup
2019-04-28-1342-20b9b305-0000003   Sun Apr 28 13:42 2019   Rotating snapshot with auto cleanup
2019-04-28-1343-20b9b305-0000003   Sun Apr 28 13:43 2019   Rotating snapshot with auto cleanup
2019-04-28-1344-20b9b305-0000003   Sun Apr 28 13:44 2019   Rotating snapshot with auto cleanup

Inspect snapshots

To display the details of a particular snapshot run cio snapshot info $snapshot_id:

$ cio snapshot info 2019-04-28-1340-20b9b305-0000003
snapshot: 2019-04-28-1340-20b9b305-0000003
source id: 3
type: rotating
directory: /cio/d/vd3/.snap/2019-04-28-1340-20b9b305-0000003
time: Sun Apr 28 13:40 2019
source: vol
description: Rotating snapshot with auto cleanup

Delete snapshots

Snapshots can be deleted by running cio snapshot rm $snapshot_id:

# cio snapshot rm 2019-04-21-1626-2c19b9f6-0000005
Delete snapshot on volume rotate at '/cio/snap/vd5/.snap/2019-04-21-1626-2c19b9f6-0000005'
Last Updated: 9/26/2019, 1:18:46 AM