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  5. Migrating a Cluster

Migrating a Cluster

Cluster migration migrates data from a cluster to another one. In certain scenarios, for example, due to the growing business data, you can create a cluster of higher specifications and migrate all data of the current cluster to the new one. Alternatively, you can merge indices in two clusters to one cluster to satisfy your business needs. CSS enables cluster migration by using the backup and index restoration function, specifically, by restoring the snapshot of a cluster to the target cluster.

In this example, assume that the following conditions apply: Data of cluster Es-1 is migrated to cluster Es-2,


  1. On the Cluster Management page, click Es-1. On the displayed page, click Cluster Snapshots.
  2. Click Create Snapshot to manually create a snapshot. In the displayed dialog box, enter the snapshot name and click OK.

    If you use the backup and index restoration function for the first time, you need to perform basic configurations first. For details, see Manually Creating a Snapshot.

    Figure 1 Creating a snapshot
  3. In the snapshot list, locate the row where the target snapshot resides and click Restore in the Operation column to restore data to cluster Es-2.
    • Leave the Index option blank (default setting), indicating to restore data of all indices in cluster Es-1.
    • From the Cluster drop-down list, select Es-2.

    Click OK. You can also rename the restored index. For details, see Index Backup and Restoration.

    Figure 2 Restoring a snapshot
  4. After restoration is complete, data in cluster Es-1 is migrated to cluster Es-2.