How to Read PCI Negotiated Speed on Qlogic FC HBA

(Doc ID 2000056.1)

Last updated on APRIL 22, 2015

Applies to:

SPARC T5-4 - Version All Versions and later
Information in this document applies to any platform.


To read the pci bus negotiated speed of a PCI 8Gb Oracle Qlogic FC HBAs installed on a T5-4 server.

On the T4 server platform exist an internal utility called , that reads this information from a PCI switch on the T4 server, but for the T5 platform this does not exist.


Reason for knowing the pci negotiated speed: There was some misprogrammed Emulex HBAs operating @Gen2 instead of Gen1 in a number of SPARC T4-4 systems.
This resulted in these devices reporting an extremely high rate of CEs and device faults, see:

Emulex HBA faulted following events when operating at PCIe Gen2 (Doc ID 1624749.1)

Emulex opted to implement a fix on a specific FC HBA that forced the upstream port to train @Gen1
rather than the endpoint , leading to the confusion with prtdiag output that showed a value of "5.0GTx4" = Gen2
when it was negotiating at  "2.5GTx8" = Gen1





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