HP 3PAR Remote Copy Software - Manual (Page 125)

5.5 Performance Notes for RCFC Configuration
InForm OS Version 2.3.1 Remote Copy User’s Guide
5.2 Performance Notes for RCFC Configuration
The following sections contain performance notes for Remote Copy over Fibre Channel (RCFC)
configuration.
5.2.1 RCFC Links
For Remote Copy over Fibre Channel configurations, each link between a Remote Copy pair is a
physical link between a controller node on one storage server and a controller node on the
other storage server in the pair. These physical links can use a 4 Gbps Fibre Channel adaptor
port from each of the two nodes in the storage servers that belong to the Remote Copy pair.
Remote Copy over Fibre Channel (RCFC) uses a maximum of one RCFC link per node and a
maximum of two RCFC links per system. For 1-to-N Remote Copy, the primary server can have a
maximum of two RCFC links. For 1-to-N Remote Copy where there are two backup servers, the
primary storage server can have a maximum of four RCFC interfaces.
5.2.2 Initial Sync
In general, when running Remote Copy on a pair of InServ Storage Servers, the highest link
throughput (MB/s) is achieved during the initial synchronization of the primary and secondary
volumes.
5.2.3 Distance
As the physical distance between the storage servers in the Remote Copy pair increases, there
might be an increase in latency and a decrease in throughput.
5.2.4 Remote Copy Mode
Remote Copy over Fibre Channel supports synchronous and asynchronous periodic modes. See
Remote Copy Operation on page 2.20 for additional information about each mode.
5.3 Scripting Notes
If a script is used to create the Remote Copy configuration and links are added using the
creatercopytarget command, be aware that after the admitrcopylink command is
invoked to configure the communication links, it takes some time for the TCP/IP connections to
be established. It can take as long as two minutes for the links to be marked Up and the target
marked Ready.