[mythtv-users] Migrating RAID

Mike Perkins mikep at randomtraveller.org.uk
Sun Nov 4 11:32:09 UTC 2007


Rudy Zijlstra wrote:
> It is running though a conduit.. which is pretty full. Which means i 
> have no space for the connector to pull through :(
> Also, inside i have to go through some small spaces, and increasing 
> space for this is a major work :(  Cat 5e cable can stand quit a bit off 
> pulling, and sharp corners. Not so certain on fiber optic cable in that 
> respect.
> 
> hmmm, could do it for a short run, simply to have the isolation. Do not 
> care too much about a device being fried. Problem with an almost direct 
> hit is, i am rather afraid it would not only fry the switches at both 
> ends of that cable, but might actually continue on through those 
> switches onto the rest of the network.

You're wasting your time. If the data link was the only thing connecting the two 
buildings, which I suspect is what most readers thought, the advice you have 
been offered so far is good.

However, if you have a conduit "pretty full" of other cables the safety of your 
data cable is moot. What do you think lightning is going to do if it finds a 
whole lot of copper running between both buildings?

If you have to run your data cable, do it in another conduit which runs via a 
completely separate route between the two buildings. Regardless of the 
twisted-pair theory, you shouldn't be running power and data in the same conduit 
anyway. (It breaks fire regs in the UK. YMMV.) That will also enable you to run 
fiber the whole length. And also to plan a route in and out of the termination 
rooms without too sharp bends. Fiber don't like bends.

If you get struck by lightning, however, I think you'll find the data link would 
be the only thing that survives of either building. As a previous writer said, 
you'd have much bigger problems.

Mike Perkins


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