Configuring storage subsystem resources for PPRC

All synchronous copy operations, including PPRC, have an inherent performance penalty: Write operations to the primary subsystem must wait until the data is secure in the secondary subsystem before sending completion status. This necessary step adds a minimum of an additional fast write operation plus the data transmission times.

You must properly configure your PPRC resources to do the following:

Minimize additional impact on system performance.
Avoid unintended interruptions of the remote copy function.
Maximize the data integrity of the secondary volumes.

Note: PPRC extended distance, an asynchronous mode of operation, allows primary systems to complete application I/O before sending it to the secondary volume.

For additional information about PPRC extended distance, refer to Managing PPRC extended distance mode.