Troubleshooting Using Hp P6000 Command View - HP MPX200 User Manual

Beginning with version 3.4.0.0, a wanlinktest CLI command was added to the MPX200 to
facilitate the testing of the WAN link between two MPX200 Multifunction Routers. This diagnostic
does not require any data replication software, storage arrays, or even a Fibre Channel connection
to test the WAN link. The primary purpose of the diagnostic is to determine the available bandwidth
and RTT on the WAN link. These two values are used as look up in tables or to calculate the correct
settings to configure the FCIP route that will use the WAN link. For more information, see
window size/scaling performance tuning" (page
The diagnostic output reports two bandwidth numbers: one using TCP protocol and the other using
UDP protocol. The UDP bandwidth is the better indicator of the actual size in bandwidth of the
WAN link and therefore is used in determining the TCP Windows size/scaling factor. The TCP
bandwidth will always be slightly lower than the UDP bandwidth because TCP has more overhead
than UDP, but does guarantee delivery. A large difference between the UDP and TCP bandwidth
could indicate that there is congestion or excessive packet loss on the WAN link.
NOTE: The resulting UDP bandwidth determined by the diagnostic may not be the bandwidth
setting used when configuring the FCIP Route(s). For example, if when testing the WAN link the
diagnostic determines there is a 100 Mbps of UDP bandwidth and this link is shared with two
pairs of MPX200 routers, then each pair of MPX200 routers would be configured for 50 Mbps or
one-half the total bandwidth.
The diagnostic is implemented as a client/server model and only one route can be tested at a time.
All normal functions of the GE port under test are disabled while the diagnostic is running. To run
the test first on one MPX200, the wanlinktest setup command is used to configure the server
side of the WAN link. For more information on these commands see
command" (page
Once the server-side MPX200 is configured, the wanlinktest start command is used on the
other MPX200 to configure/start the client-side of the diagnostic. Once the test is started, the
wanlinktest show command can be used on the client side to display a summary result every
five minutes while the test is running, or after the test is completed the command will provide a
summary report. The wanlinktest show command also creates a file named
wan_link_test_results.stats in the ftp directory that contains a one line summary of the
last 1024 runs of the diagnostic. When the diagnostic testing is complete, the wanlinktest
stop command must be executed on the server-side to restore the MPX200 back to normal operating
mode.
The minimum time to run the diagnostic is five minutes, but the longer the diagnostic is run the more
accurate the results will be. For example, running the diagnostic overnight may identify other traffic
congestion periods for backups or other WAN applications sharing the link that might be missed
in a shorter test.

Troubleshooting using HP P6000 Command View

You can use HP Command View EVA to display the properties for each iSCSI controller. At a
glance, you can check the controller's serial number and temperature and power/cooling status
(Figure 127 (page
146 Diagnostics and troubleshooting
192).
147)).
123).
"wanlinktest
"TCP