What is a characteristic of SRDF/Metro?

Data must be stored in cache on both sides before an acknowledgement is sent to the host.

Multiple capture sets permit smaller cycles of data to be buffered on the R1 side and transferred to the R2 side.

A dependent-write consistent copy is maintained between the R1 and R2 devices.

Devices that have the Consistency Exempt attribute set can be controlled independently of the other devices.