I was performing some configuration on my QLogic 5602s and noticed
some discrepancies in the speeds of my Apple copper fibre channel
cables. Specifically I have a variety of new (some *brand* new) 2GB
rated cables plugged in that are showing up with media speeds rated at
400MBytes/second. The older 2GB cables only show up as 200MBytes/
second, as I would expect. Most of these are plugged into Xserve
RAIDs and older Xserve G5s, thus they are running at the 2GB rated
speed. However, for some temporary reorganization I have one of my
Active Storage cabinets connected with these 2GB cables. Since
everything is currently set to auto for the relevant ports, I had
assumed it would downgrade itself to 2GB, but to my surprise it is
connected at 4GB.
So my question is, will this be problematic and thus should I manually
set the ports to be 2GB or have I simply been lucky enough to get some
4GB cables for a 2GB price?
FWIW, the media part number and revision of the 2GB cables are all the
same according to the switches (73929-0074 revision D). My actual
4GB cables report themselves as 74743-0021 revision A.
David
Library Information Technology
Michigan State University
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