The enhanced flexibility with synchronous PPRC means that you can have some volume pairs established in synchronous mode and others in PPRC extended distance mode. For example, if you have an environment with restricted bandwidth but have volumes that are critical to your operation, you can establish those volumes in synchronous mode. Synchronous mode allows the recovery storage control to remain current with the primary storage control, which is critical should a disaster occur. Less critical volumes can be established in PPRC extended distance mode.
In addition, you might also consider using PPRC in synchronous and extended distance modes of operation during peak and nonpeak hours. For example, you might consider using PPRC extended distance mode during peak work hours when minimal performance impact to primary applications is an important requirement. Then, during nonpeak hours, you can use synchronous mode, which allows your data to remain current at the recovery site in the event that an unplanned outage or disaster occurs.
For additional information about when to use PPRC extended distance mode and synchronous mode, refer to Using extended distance and synchronous modes during peak and nonpeak operations.