HP AA979A - StorageWorks SAN Switch 2/8V, Administrator'S Manual, Page: 327 / 465

Fabric OS 5.3.0 administrator guide 339
Displaying and clearing the CRC error count
You can use the
perfShowAlpaCrc
command to display the CRC error count for all AL_PA devices or for
a single AL_PA on a specific active L_Port.
Example: Displaying the CRC error count for all AL_PA devices on a port
Example: Displaying the CRC error count for a single AL_PA device on a port
Example: Clearing the CRC error count
In v3.1.0, v4.1.0, and later versions, you can use the
portStatsClear
command clears AL_PA- based
CRC error counters for all the ports in the same group.
Monitoring end-to-end performance
End-to-end performance monitoring counts the number of words and CRC errors in Fibre Channel frames
for a specified Source ID (SID) and Destination ID (DID) pair. An end-to-end performance monitor includes
these counts:
• RX_COUNT (words in frames received at the port)
• TX_COUNT (words in frames transmitted from the port)
• CRC_COUNT (frames with CRC errors received at or transmitted from the port)
To enable end-to-end performance monitoring, you must configure an end-to-end monitor on a port,
specifying the SID-DID pair (in hexadecimal). The monitor counts only those frames with matching SID and
DID.
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 347. You can clear end-to-end counters using the
perfMonitorClear
command, as described in ” Clearing monitor counters ” on page 349.
NOTE: For end-to-end monitors, CRC counters are not displayed on the 4/16 SAN Switch and 4/8 SAN
Switch, Brocade 4Gb SAN Switch for HP p-Class BladeSystem, Brocade 4Gb SAN Switch for HP c-Class
BladeSystem, SAN Switch 4/32, SAN Switch 4/32B, 4/64 SAN Switch, 400 MP Router and the 4/256
SAN Director.
switch:admin> perfshowalpacrc 1/1
AL_PA CRC count
--------------------
0xd9 0
switch:admin> perfshowalpacrc 1/1, 0xd9
The CRC count at ALPA 0xd9 on port 1 is 0x000000000.
switch:admin> perfclearalpacrc 1/1, 0xd9
CRC error count at AL_PA 0xd9 on port 1 is cleared.
switch:admin> perfclearalpacrc 1/1
No AL_PA value is specified. This will clear all AL_PA CRC
counts on port 1. Do you want to continue? (yes, y, no, n): [no] y
Please wait ...
All alpa CRC counts are cleared on port 1.