A customer plans to migrate data from a third-party storage system to an HP 3PAR StoreServ 7000. They have an ISP connection between two offices. The new storage system must replicate data between the

Synchronous replication requires near-zero round-trip latency to avoid host I/O stalls; an ISP WAN link introduces too much variable latency for synchronous mode to be viable.

FC-based Remote Copy requires a dedicated Fibre Channel inter-site link or FC-over-WAN infrastructure, which the customer does not have - only an IP-based ISP connection exists.

FC-based replication of any mode requires a Fibre Channel transport between sites, which is absent here since the customer only has a standard ISP IP connection.

HP 3PAR Remote Copy over IP leverages the existing ISP connection, eliminating the need for a dedicated Fibre Channel inter-site link. Asynchronous replication is the correct mode for WAN environments because writes are acknowledged locally before being transmitted to the remote site, preventing the variable and elevated latency of an ISP link from stalling host I/O operations. Synchronous replication over a high-latency WAN would force every host write to wait for remote acknowledgment, severely degrading application performance.