Managing Global Mirror

The parameters for managing a Global Mirror session can be modified simply by pausing and then resuming the session with the new parameters. The parameters that can be modified are:

Consistency group interval time
Maximum coordination interval time
Maximum consistency group drain time

The topology of the Global Mirror session (master SSIDs, subordinate SSIDs, and subordinate serial numbers) cannot be changed without stopping and restarting the session. The session ID cannot be changed for an active session.

The RSESSION start or resume command may be issued to any device and CKD LSS in the master storage control. If you try to start or resume a device in a subordinate storage control, the request will fail. Once the session is active (initial configuration created), all START, PAUSE, RESUME and STOP commands to the master storage control must be issued to the same LSS where the start was issued as long as the configuration exists. IBM® recommends that the same device in the master storage control be used for all START and RESUME commands.