Increasing mtu (optional), 3 increasing mtu (optional) – HP 3PAR Remote Copy Software User Manual
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3.11
Setting the Remote Copy Transport Layer
InForm OS Version 2.3.1
Remote Copy User’s Guide
This command performs a ping from the specified interface (
) to the specified IP
address on the target system (
). Issue this command twice (once for each
interface), for each system in the configuration.
If the
controlport rcip ping
command does not work:
◆
Verify that the GigE cards are all in the
ready
state using the
showport -rc
command.
◆
Verify all IP addresses, netmasks, gateways, and physical connections.
◆
Use
controlport rcip ping
to test connectivity between both IP interfaces on
both systems.
◆
Verify the MTU settings are correct. See
more information.
◆
Verify the
controlport rcip speed
settings. See
details.
If the pings do not succeed, seek help from a Network Administrator.
3.4.2.3 Increasing MTU (Optional)
Depending on the network setup, you might be able to increase the maximum transmission
unit (MTU) size of the GigE interfaces to increase throughput between storage servers. The
throughput and CPU utilization of GigE adapters can be improved if the adapters are
configured to use jumbo frames (9000-bytes frames) rather than the default 1500-byte frames.
When supported by the network, use an MTU value of 9000. However, note that this setting
requires that the IP network support jumbo frames end-to-end (along the entire path between
the two storage servers).
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.
CAUTION: Do not proceed with the rest of the Remote Copy setup until pings
succeed between the GigE ports in the two storage servers.