Setting Port Speed on HBA - A6795A

[Del_3]

Can anyone tell me how to hard set the port speed on a A6795A HBA for HP-UX 11.23 on an rp4440.

Thanks

[Zinky]

I do not think you can. The speed at which these tachyon cards connect depends on the switch port settings they're connected to. We usually set the switch ports fixed to 2G instead of AutoNegotiate.

[Torsten.]

The card will auto-negotiate the speed depending the settings on the other end.

[TKeller]

You can set the speeds of the HBA as well as the mac address through the lanadmin command.

I'm finding the physical files that you can modify.

Also, find more info here : http://docs.hp.com/en/5187-1361/ch07s03.html

[Victor BERRIDGE]

Hi,
I never had to, and dont believe it possible, I know that when you have issues you go switch side (had cases where HBAs being 1GB coulnd negociate properly - forced the port on the switch at 1 GB...)


All the best
Victor

[Zinky]

Tkeller,

You may be correct BUT only if you are using your tachyon fibre channel cards to run IP over FC - which I do not think no one does so these days or is even supported.

On Solaris, I used to run IP over FC (JNI Cards whic are also Tachyon based) - with much success.

I do wonder, why would you want to set your HVA end to a fixed port speed? The highest speed operation on FC cards as well as most Gigabit ethernet cards is to have the switch end and the HBA end on Auto-Negotiate.

[Enrico P.]

Hi,

http://docs.hp.com/en/5187-1361/ch07s03.html

It is Dec2001 but I think this is actually.

Now available is the new 2Gb, single port Fibre Channel Host Bus Adapter. The A6795A PCI Tachyon XL2 adapter operates at bus speeds of up to 66 MHz with 64 bits bus width and can transfer data at a 1Gb or 2Gb transfer rate. The adapter has auto-speed negotiation that enables it to negotiate for the highest speed (1Gb or 2Gb) that is common to the port and to the infrastructure connecting the port. Using the fcmsutil diagnostic tool, you can display link speed and Vital Product Data (VPD) information programmed on the adapter.

Enrico

[TKeller]

Nelson, you're right now that I think about it. I was thinking of it in a network-context and in my experience (RP8400 with dual FC Tachyons, 2gb), I was told to set it to 1gb just because it might be "too fast", hehe... And sometimes, auto-negotiation isn't the best idea in some instances.

[Del_3]

Here is the command:

# fcmsutil /dev/td0 force_speed 2G

1000 points to me.

[Del_3]

Thanks to all who responded.