Sessions

A session completes a specific type of data replication for a specific set of volumes. During data replication, data is copied from a source volume to one or more target volumes, depending on the session type. The source volume and target volumes that contain copies of the same data are collectively referred to as a copy set. A session can contain one or more copy sets.

Attention: Use only the Copy Services Manager graphical user interface (GUI) or command-line interface CLI to manage session relationships, such as volume pairs and copy sets. Do not modify session relationships through other interfaces such as the System Storage DS CLI. If you modify relationships through other interfaces, a loss of consistency can occur across the relationships that are managed by the session. The exceptions to this requirement are failover operations that are managed by external applications for certain session and storage system types as described in Failover and failback operations.