HP 3PAR Operating System Software - Manual (Page 101)

Distribution of Host Writes over RCIP GigE Links
When copying data from the primary system to the backup system, Remote Copy uses all the RCIP
GigE links simultaneously in order to achieve the maximum throughput (MB/s) possible. A single
host write I/O is sent on a single link, but different I/Os can be sent on different links.
•
If host writes come over a node configured with Remote Copy GigE links, Remote Copy
attempts to use the local GigE link to send the data to the backup system.
•
If host writes come over a node configured with nonlocal links, Remote Copy distributes the
data among the Remote Copy GigE links in order to send the data to the backup system.
Therefore, depending on how the host writes to the nodes are distributed, the RCIP GigE links might
not always have the same traffic rate.
Considering Additional Impacts on Performance 101