User Manual

146 Administering advanced performance monitoring
Each SID or DID has three fields, listed in the following order:
• Domain ID (DD)
• Area ID (AA)
• AL_PA (PP)
For example, the SID 0x118a0f denotes DD 0x11, AA 0x8a, and AL_PA 0x0f.
You can monitor end-to-end performance using the perfmonitorshow command, as described in
”Displaying monitor counters” on page 153. You can clear end-to-end counters using the
perfmonitorclear command, as described in ”Clearing monitor counters” on page 155.
NOTE: For end-to-end monitors, CRC counters are not displayed on the SAN Switch 4/32.
Adding end-to-end monitors
An end-to-end monitor counts the following items for a port: number of words received, number of words
transmitted, and number of CRC errors detected in frames.
The HP StorageWorks SAN Switch 2/8V, SAN Switch 2/16V, SAN Switch 2/32, Core Switch 2/64,
and SAN Director 2/128 allow up to eight end-to-end monitors.
The SAN Switch 4/32 allows up to 256 end-to-end monitors shared by all ports. (The number of
interswitch links configured on the switch affects the amount of resources available for
end-to-end monitors.)
End-to-end monitors cannot be added to interswitch links.
The monitor count is qualified using either of following conditions:
• For frames received at the port with the end-to-end monitor installed, the frame SID is the same as
SourceID and the frame DID is the same as DestID. The RX_COUNT and CRC_COUNT are updated
accordingly.
• For frames transmitted from the port with the end-to-end monitor installed, the frame DID is the same as
SourceID and the frame SID is the same as DestID. The TX_COUNT and CRC_COUNT are updated
accordingly.
NOTE: How the area ID for a port relates to the port number depends upon the PID format used by the
fabric. See ”Configuring the PID format” on page 203 for more information.