
3.12
Setting the Remote Copy Transport Layer
Remote Copy User’s Guide InForm OS Version 2.3.1
If the MTU value of 9000 is supported by the network, increase the MTU as follows:
1 For the GigE ports on each storage server, increase the MTU size to 9000 as follows:
:
where <N:S:P> represents the location of a GigE port, expressed as node:slot:port.
2 After setting the MTU to 9000 bytes for all GigE ports, verify that the network supports the
increased MTU size from any storage server as follows:
This command performs a ping from the specified interface (
<N:S:P>) to the specified IP
address on the target system (<IP_address>) while specifying a packet size of 8972 and
preventing fragmentation of packets. Issue this command twice (once for each interface),
for each system in the configuration.
◆ If the pings succeed, the network supports the new setting. Proceed to Setting Up
Remote Copy on page 3.16.
NOTE: Depending on workload, you might see as much as a 50 percent increase in
throughput by using a 9000 byte MTU setting as opposed to a 1500 byte MTU
setting.
# controlport rcip mtu 9000 <N:S:P>
Remote Copy change successful.
NOTE: Remember to change the MTU setting for both ports in each storage
server to be used in the Remote Copy configuration.
# controlport rcip ping -s 8972 -pf <IP_address> <N:S:P>
NOTE: Because of the spanning tree and MAC address learning, you might need
to ping each server several times before all tables are updated and the ping
succeeds.
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