On 06/03/2014 06:03 PM, Robert Hajime Lanning wrote: > On 06/03/14 17:44, Skylar Thompson wrote: >> I'm not aware of any 10GBASE-T <-> SFP+. I think you might be thinking >> of SFP+ direct-attach (DA) cabling, where each end of the cable is a >> SFP+ transceiver. My experience is that the total cost of 2x SFP+ NICs >> plus a DA cable is about half the cost those NICs, optical cable, and 2x >> SFP+ SR transceivers. You do want to be very careful about compatibility >> - we've had problems using the HP SFP+ DA cables with a HP zl switch and >> a Intel SFP+ NIC in a Dell server. > > Say you have two servers directly connected to each other... > > server(NIC) - SFP+ module - fiber cable - SFP+ module - (NIC)server > or > server(NIC) - Twinaxial (DA) cable - (NIC)server > > The DA cable you are talking about have the SPF+ module hard attached to > the ends. > > NIC ~$300 x2 > SFP+ Module ~$50 x2 > Fiber Patch ~$20 x1 > $720 > > or > > NIC ~$300 x2 > Twinaxial ~$90 x1 > $690 > > $30 delta... ehh... it's a wash... :) > > It used to be a lot different. The last datacenter I put together (2 > years ago), the 10G SFP+ modules were ~$1000 each. You can get them for > between $50 and $100 now. >
Ah, yeah, we stopped using DA cables about two years ago since all of our 10G networking gear is HP while none of our edge gear is, so the compatibility issues were a bit of a headache. Unfortunately, the cheapest knock-off SFP+s we found that work in the HP switches are still around $200/ea. At this point we're almost all 10GBASE-T except for the long-distance gear and boxes we can't get UTP NICs, since we can get same port density as SFP+ with none of the transceiver costs. Skylar Skylar _______________________________________________ Tech mailing list Tech@lists.lopsa.org https://lists.lopsa.org/cgi-bin/mailman/listinfo/tech This list provided by the League of Professional System Administrators http://lopsa.org/
