Technical data

Fabric OS Administrator’s Guide 14-3
Publication Number: 53-0000518-09
Displaying and Clearing the CRC Error Count
14
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.
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> perfclralpacrc 1/1, 0xd9
CRC error count at AL_PA 0xd9 on port 1 is cleared.
switch:admin> perfclralpacrc 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.