how to isolate B2B credit Zero increase is it critcal does it cause any SAN performance issues
if tim_txcrd_z / frames tx’d > zero (for example if value is 1 or more)
What does it indicates how to diagnose and fix these issues.
this counter will increase by 1 every 2,5 microsecond when the port credit value is zero.
In normal operation you may detect some low values on this counter, which don't represent any issue.
Othervise If you will see c3discards on particularr port, than you have to focus more on that.
Please refer to this article to get better overview:
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