How to check and measure FC HBA utilization?

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Issue

How do I to check and measure FC HBA utilization?
How do I determine how much io is going through an HBA?
How do I determine if an HBA is being overloaded with io?
How do I determine if an HBA has reached its available capacity limit?
We want to monitor the data transfer/sec with each Fibre Channel Adapter

Environment

Red Hat Enterprise Linux ( RHEL ) 5
Red Hat Enterprise Linux ( RHEL ) 6
Red Hat Enterprise Linux ( RHEL ) 7
FC HBA adapter such as Qlogic or Emulex.

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