Once upon a time, Ian Pilcher <arequipeno@xxxxxxxxx> said: > For short runs, you can use DAC cables; no need for separate SFP+ > modules. FS.com has 2m 10G DAC cables for $14. It's a trade-off... cards that take SFP+s tend to cost more than cards with just an RJ-45 jack. I do have a DAC cable between my router and switch (because both are SFP+), but then I have RJ-45 SFP+s in the switch for the computer ports (because the computers are just RJ-45). > (Just make sure that their coded properly for the hardware that you're > going to use them with.) This is sooo stupid. Even as network vendors have mostly backed off this crap, Intel's drivers in the Linux kernel enforce vendor coding. The driver for older chips has a module option to disable it, but the more recent driver for newer chips doesn't even have that. I was very surprised when I got bit by this at a previous job - we tended to get FiberStore "generic" coded modules, which work just fine in equipment from multiple vendors, but then newer Dell servers with newer Intel 10G chips rejected them. We shipped out servers to a customer, who only after shipment said they wanted 10G rather than 1G connections, and asked if they could install an SFP+ they had on hand (it was a telephone company ISP, they had lots), and we said "sure" and proceeded to go through lots of troubleshooting, with them swapping modules, before it got to me and I checked and saw the Linux kernel rejecting the modules. Embarrassing for us. -- Chris Adams <linux@xxxxxxxxxxx> _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
