Greg, Greg Lindahl wrote:
I see that HP has a 6-port switch for ~ $4k, too small.
Don't know if it was specific to the model we tested, but hardware flow control does not work in one direction, even when turned on.
Arastra looks nice, except that their inexpensive 10base-CR only does SFP+, not X2. And CX4 SFP+ doesn't even seem to exist (lack of space for the connector?)
There are 3 silicon vendors for small (< 24 ports) integrated 10G crossbars: Fujitsu, Fulcrum and Broadcom. They work ok, some better than others. Do a N->1 flow-control test (N >= 6) to see which one does not have enough internal buffering.
Arastra switches are good, based on Fulcrum. SFP+ Twinax cables are as cheap as CX4 and much smaller footprint on the switch, that's why everybody is using it today (and QSFP for low-cost fiber). I have seen SFP+ to CX4 adapters, but I can't seem to find a source online. You may want to ask Arastra. Another solution would be to use SR fiber transceivers on both sides, one X2 and one SFP+. That would be a shame if you don't need the distance, as it will be significantly more expensive than a copper SFP+/CX4 solution.
Patrick _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
