Adam, Are these SC or LC connectors? In my experience the fiber on most SC patch cables can be swapped at the connector, but with LC the fiber has to be swapped on the backside of the patch panel.
-David On Thu, Oct 11, 2012 at 1:05 PM, Adam Levin <[email protected]> wrote: > I've got a curious issue in a new small datacenter lab, and I'm curious > about it. > > We just moved our lab to a new facility. In the old lab, we used > top-of-rack switches (Cisco 9148) with inter-switch links back to a Cisco > MDS 9222 core. All of the hosts plugged into the 9148s, and the storage > plugged into the core, and all was Good In The Kingdom. > > In the new facility, all of the hosts (and some storage) plugs into > lightguide fibre patch panels, which run back to a rack that has the 9148s > and the 9222s. > > 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. > > The lightguide panels are straight passthrough, as are the cables, which are > standard FC cables. So, of course with the lightguide in the middle, the Tx > and Rx would naturally get mixed. In other words, a duplex cable plugged > into ports 1/2 on the lightguide would end up reversing the light paths, > which of course causes problems. > > 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? > > Thanks! > -Adam > > _______________________________________________ > 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/ > _______________________________________________ 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/
