HP 3PAR Operating System Software - Manual (Page 128)

16 Optimizing Performance
“Optimizing RCIP Throughput by Increasing MTU Size”
(page 128) To optimize RCIP throughput, increase MTU size.
“Avoiding RCIP Throughput Issues during Initial
Synchronization” (page 128) To optimize RCIP throughput during initial synchronization,
use tape.
“Optimizing RCIP Synchronization Speed over Distances”
(page 128) To optimize synchronization with a remote system, balance
bandwidth and latency.
“Troubleshooting RCIP Autonegotiation Issues” (page 130) If autonegotiation does not function properly, adjust the
speeds of the RCIP and local switch ports.
Avoiding RCIP Throughput Issues during Initial Synchronization
During initial synchronization of the primary and secondary volumes, RCIP throughput can be as
high as 100 MBps on a single GigE link, or 400 MBps when four links connect the remote-copy
pair.
To avoid high network utilization and latency during initial synchronization, seed the target array
with tape for the initial synchronization. For more information, see
“Using Tape for Initial
Synchronization and Backup” (page 151) .
Optimizing RCIP Synchronization Speed over Distances
As the physical distance increases between the systems in the remote-copy pair, latency can increase
and throughput can decrease.
To optimize the speed and size of data transfers between a remote-copy pair connected by RCIP,
issue the following command:
# setrcopytarget tunelinks <bandwidth> <latency> <target_name>
where:
•
<bandwidth> —Bandwidth of the connection to the target system in KBps
•
<latency> —Round-trip latency of the connection to the target system in milliseconds (ms)
•
<target_name> —Name of the target system
For more information, see:
•
“About the Remote-Copy Commands” (page 261)
•
The HP 3PAR Command Line Reference .
To access this document, go to the HP 3PAR StoreServ Storage site and click the Support link
for your product:
www.hp.com/go/3par
Optimizing RCIP Throughput by Increasing MTU Size
By default, RCIP GigE interfaces use a 1500 byte MTU setting because all vendor hardware
supports this MTU size.
128 Optimizing Performance