Yeah, thanks. I think it is very strange that nobody had solved this common problem, but we ended up breaking them apart and flipping the sides after all. It is rough with so many cables at once.
Adam Jeff Woolsey <[email protected]> wrote: >On 10/11/12 10:05, Adam Levin wrote: >> >> Here's the problem: when we run cables from HBAs (in hosts or in >> storage systems) direct to the switches, the Tx and Rx are correct. >> When the lightguide patch is in the middle, the Tx and Rx are >reversed. > >Some time ago, almost ten years now, when we started hooking things up >in a newly-renovated server room, it took a while to figure out which >part of the storage path was borken. Turned out that the connections >between patch panels was straight-through. > >> >> What I'm not sure about is what is normal for this configuration? Do >> people normally buy "crossover" FC cables to use with a patch panel, >> or do people buy proper patch panels which "uncross" the streams? > >In my opinion, all duplex fiber should be crossover, even the runs in >walls between patch panels. That way you have a net twist, everything >has Rx connected to Tx. (You will run into a problem if you use any >passive bulkheads (FDDI had some, SC could too)) > >If the panels are straight, then the conections can be kludged in one >place (of four possibilities, since these were SC-LC cables) by >unclipping either end (and not reclipping to make a straight cable), >making the problem a little more noticeable. Alas I wasn't in charge >of that room and nobody ever fixed the parity on the panels, as far as >I >know... > >-- >Jeff Woolsey {woolsey,jlw}@{jlw,jxh}.com [email protected] >Spum bad keming. >Nature abhors a straight antenna, a clean lens, and unused storage >capacity. >"Delete! Delete! OK!" -Dr. Bronner on disk space management >"Card sorting, Joel." -me, re Solitaire > >_______________________________________________ >Tech mailing list >[email protected] >https://lists.lopsa.org/cgi-bin/mailman/listinfo/tech >This list provided by the League of Professional System Administrators > http://lopsa.org/
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