Distance; Bandwidth Per Route; Latency; Mtu/Jumbo Frames - HP StorageWorks MPX200 User Manual

100 Mb/s with an MTU size between 1,000 and 9,000 bytes (jumbo frames). Related performance
characteristics include the following:
•

Distance

•

Bandwidth per route

•

Latency

•

MTU/Jumbo frames

• Compression
• TCP window size/ scaling performance tuning
• Modifying the window size and scaling factor
• TCP window size and scaling factor recommendations
Distance
Consider the physical distance between the MPX200 Multifunction Routers. This is usually measured
in RTT. The RTT can be anywhere from less than 1 millisecond to as great as 200 milliseconds.
Bandwidth per route
Bandwidth is a measure of the volume of data that can be transmitted at a given transmission rate.
WAN data rates typically range from 1.5 Mb/s (T1) to 1 Gb/s. The proper MPX200 bandwidth
setting is determined based on the bandwidth that is available for each FCIP route, irrespective of the
total bandwidth and physical speed of the link.
To determine the proper MPX200 bandwidth setting, start with the total bandwidth of the WAN link.
Adjust this number based on the guaranteed allocated FCIP bandwidth and further adjust this number
if the number of FCIP routes configured is greater than one. For example, if the WAN link is 45 Mb/s
and 15 Mb/s is allocated to network traffic, the remaining 30 Mb/s is available for FCIP. If in this
example the MPX200 is configured for two routes, based on the 30 Mb/s total bandwidth available
for FCIP, you would set the MPX200 bandwidth parameter to 15, the available bandwidth for each
FCIP route.
HP StorageWorks Continuous Access EVA replication solution requires dedicated bandwidth for the
intersite link. If other applications share the intersite link, some method of QOS must be used to ensure
that the replication application has uncontested access to the allocated bandwidth.
NOTE:
Setting the bandwidth per route setting higher than the actual bandwidth available for each route
results in a decrease in performance; the optimal setting matches the bandwidth per route setting to
the actual bandwidth available for each route.
Latency
Latency is the amount of time a packet takes to traverse the network from source to destination.
MTU/Jumbo frames
• For MTU size there are 3 choices, normal (1500 bytes), Jumbo (9000 bytes) and other, where
you are then prompted for a value between 1000 and 9000.
132 MPX200 FCIP