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Oracle Qlogic 16/32Gb Fibre Channel (FC) HBA cards using Loopback Plug to do a Loopback Test (Doc ID 2595525.1)

Last updated on SEPTEMBER 02, 2021

Applies to:

Sun Storage FCoE CNA - Version All Versions to All Versions [Release All Releases]
Linux OS - Version 1 to Oracle Linux 8.0 [Release RHEL3 to OL8]
Qlogic FC HBA - Version All Versions to All Versions [Release All Releases]
Solaris x64/x86 Operating System - Version 8 6/00 U1 to 11.1 [Release 8.0 to 11.0]
Sun Storage FC HBA - Version All Versions to All Versions [Release All Releases]
Information in this document applies to any platform.


Assuming the HBA card is in FC mode (if applicable) and has 16Gb (or above) SFP's install and is configured to Auto-Negotiate at least to 16Gb, then Loop mode is not supported so Loopback plug will not change OS port back to online state.

The port will be listed by Qlogic FC HBA Tool "QConvergeConsole CLI" as "D-port or "Diag Port".

When a FC Loopback Plug is inserted into port:

- FC HBA port LED pattern will still display as offline.

- Solaris "fcinfo hba-port" command will still list port as offline.

- Linux "/sys/class/fc_host/host*/port_state" will still list the port as Linkdown.

But Loopback Plug can still be used to perform a Loopback Test to verify port functionality.

If Auto-Negotiation has be overridden and set to speed below 16Gb, port will then support Loop mode.

Qlogic FC HBA Tool "QConvergeConsole CLI" and personnel onsite by server are required (see Note 1 at end of this document).
Also recommend downloading User Guide as well.



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