Maximum Number of NICs and Ethernet Ports

Dear Friend,
I am looking into constructing a Sun system with the maximum number of ethernet ports.
Q1: is there a Solaris 8 specific maximum number of ethernet ports that it can support?
Q2: i know you can get quad ethernet cards, but anyone know of cards that offer more than four per card?
Q3: assuming the cards will be PCI, which sun machine offers the maximum number of PCI slots?
I really appreciate your help
many thanks
wagwan

Hi Rukbat
Thanks for your response.
> A1: There isn't any limitation within the OS.
> Your limitations are from the hardware of the system.
Indeed, I did not think there would be a limit from within the OS. I have had a research sun machine with some 12+1 ports, an ol'Ultra-10 actually. i got upto that many ports by using three qfe's and there is one port already on the system (hme0)
>If you have too much packet traffic for your cpu modules
> and RAM, you'll have delays, data corruption, or even
> system panics.
one accepts that there would be delays - naturally. but I am not sure why there would be data corruption or even panics. that to me sounds very very serious.
the ultra-10 seems to be working ok; I never saw it crash once. But I must confess that the traffic load is not THAT high.
> Long time ago, there was a general rule-of-thumb
> for the QFE cards:
> -- one cpu per TWO ethernet ports,
> if the modules are faster than 200MHz.
erm erm I would say that is pretty low, but I would not call myself an expert on this really.
> I'm sure there is a similar suggestion for QGE's and fast
> cpu's in this 21st century.
i would like to think that one modern cpu should be ok for about 10 ports with reasonable traffic load. I am judging this by the old Ultra-10 I have built, beside which I have no supporting evidence.
> A2: There are no Sun-qualified adapters with more than
> four ports per card.
i am surprised at that.
> Third party hardware? you'd be on your own and need
> support from those manufacturers.
yes I agree
> Besides, there is only so much room on the card's
> backplate if you want to actually plug in the wires.
I take your point about the physical space on the backplate. I have found one company that is knocking up 6-port devices, and from what I gather, that is as much as one is gonna get.
> A3: A Sunfire E6900 would be able to be configured for 32
> PCI slots if you configured the system as a single
> domain. An E20k can give you up to 36 slots on a single
> domain, and an E25k can give you up to 72 PCI slots in
> a single domain.
that is a good hint actually. that is the high-end range I think.
in any case, I think the sort of machine I would be looking for is in sun's mid-range of servers. something like a V440, which has 6 PCI slots for use. I could potentially have (6x6)+2=38 ports. It is also capable of taking four 1.593-GHz UltraSPARC IIIi processors, and my gut feeling is that the four processors will be ok to support 38 ports.
I am still open to take advice of course. Indeed I would very much appreaciate further thoughts!
Regards,
bigAl

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