Specific intersite link requirements must be met when you are planning to use IP
partnership for remote copy.
If you use IP partnership, you must meet the following requirements:
TCP ports 3260 and 3265 are used by systems for IP partnership communications; therefore, these
ports need to be open.
The maximum supported round-trip time between systems is 80 milliseconds (ms) for a 1 Gbps
link.
The maximum supported round-trip time between systems is 10 milliseconds (ms) for a 10 Gbps
link.
For IP partnerships, the recommended method of copying is by using Global Mirror with
change volumes because of the performance benefits. Also, Global Mirror and Metro Mirror might be
more susceptible to the loss of synchronization.
IP partnerships can also support data compression. Both systems
in the IP partnership must be running a software level that supports IP partnership data
compression. A compression accelerator must also be installed on each system. For more information,
see Configuring IP partnerships.
The amount of intersite heartbeat traffic is 1 megabit per second (Mbps) per link.
The minimum bandwidth requirement for the intersite link is 10 Mbps. However, this requirement
scales up with the amount of host I/O that you choose to do. Figure 1 describes the
scaling of host I/O.Figure 1. Scaling of host I/O
The equation that can describe the approximate minimum bandwidth that is required between
two systems with < 5 ms round-trip time and errorless link follows:
Minimum intersite link bandwidth in Mbps > Maximum(Minimum Link Bandwidth of 10Mbps ,
Required Background Copy in Mbps + Maximum Host I/O in Mbps + 1 Mbps heartbeat
traffic)
Increasing latency and errors results in a higher
requirement for minimum bandwidth.
