Creating a Consistency Snapshot

Context

The consistency snapshot function helps you quickly save the data on multiple disks at the same point in time. You can use this function to back up your critical service data periodically. After the snapshot service for volumes is configured, DESS can use the snapshot capabilities of the storage device to create snapshots on the storage device in an instantaneous manner, reducing the backup window to zero and meeting enterprise's requirements on service continuity and data reliability.

Prerequisites

• You have created a disk. For details, see Creating Disks.
• A maximum of 512 snapshots can be created for a DESS device.
• A consistency snapshot can be created only for disks on the same DESS device.
• The available capacity of the DESS device is larger than the total capacity of the current disks.
• The available capacity of the DESS device is larger than 10 GB.
• The disks are in the In use state.

Precautions

• You can create a maximum of 512 snapshots for a DESS device and up to 7 snapshots for a disk.
• You can select a maximum of 40 disks to create a consistency snapshot at a time.

Procedure

1. Log in to the management console. For details, see Logging In to the Management Console.
2. Click and select the wanted region.
3. Use any of the following methods to display the snapshot list:
   • Method 1: Via the snapshot-residing DESS device
     1. Click and choose Dedicated Cloud > Dedicated Enterprise Storage to go to the DeC management console.
     2. In the row of the desired DESS device, click the number in the Number of Snapshots column to go to the Snapshots tab page.

        The snapshot tab page lists the snapshots of the DESS device.

   • Method 2: Via the snapshot-residing HyperMetro resource
     1. Click and choose Dedicated Cloud > Dedicated Enterprise Storage to go to the DeC management console.
     2. On the navigation pane on the left, choose Dedicated Enterprise Storage > HyperMetro to go to the HyperMetro resource list page.

        By default, HyperMetro resources in all statuses are listed.

     3. Use any of the following methods to display the snapshot list:
        • Method 1
          1. Click next to the resource name to view the HyperMetro resource details.
          2. In the row of the desired DESS device, click the number in the Number of Snapshots column to go to the Snapshots tab page.

             The snapshot tab page lists the snapshots of the HyperMetro resource.

        • Method 2
          1. In the row of the wanted HyperMetro resource, click the DESS device name in the Associated DESS Devices column to go to the device details page.
          2. In the row of the desired DESS device, click the number in the Number of Snapshots column to go to the Snapshots tab page.

             The snapshot tab page lists the snapshots of the DESS device.

   • Method 3: Via the snapshot list of all DESS devices
     1. Click and choose Storage > Dedicated Enterprise Storage Service to go to DESS Console.
     2. On the navigation pane on the left, choose Snapshots.

4. On the snapshot list page, click Create Consistency Snapshot in the upper left corner.
5. In the Select Disks area, select the disks for which you want to create a consistency snapshot. The selected disks are automatically generated in the right pane.
6. Set parameters for the consistency snapshot.

   Table 1 Parameters for the consistency snapshot

   Parameter	Description
   Consistency Snapshot Name	Name of the consistency snapshot. The name cannot be or start with autobk_snapshot_ and can contain a maximum of 63 characters without any spaces.
   Description	Description of the consistency snapshot. The description contains a maximum of 63 characters.

7. Click OK.