High Availability › Overview

Overview

This High Availability Option provides the capability to display and configure Peer to Peer Remote Copy (PPRC) paths and mirror volumes. PPRC is a hardware solution to the problem of accurate and rapid disaster recovery, and also provides a workload migration solution. This option is designed to provide data transfer synchronously and asynchronously.

Synchronous PPRC is designed to provide real-time mirroring of logical volumes within an ESS or between two ESSs. The sites using synchronous PPRC must conform to the following conditions:

• The recovery storage subsystem, must be current with the primary system.
• Some level of a performance impact to an application or applications read write I/O operations at the primary location is acceptable.
• If two ESSs are involved, they cannot be more than 103 km apart with a ESCON® connectivity, or 200 km apart with Fiber, as distances increase the performance impact worsens.