Fibre Channel is best
Hiya,
I work at a Television Production Company,
we are currently building a G5 edit suite (Pro One),
I have already bought 2 G5's for this company,
a Dual 1.8 for graphic design and DVD authoring,
and a Dual 2.0 last week for the edit suite.
We have already done an edit for broadcast with the Dual 1.8,
our capture device is an AJA IO, this is a firewire 400 capture device.
It uses the WHOLE firewire bandwidth so you can't use any firewire HD's with it, and we have been forced to look for another solution.
The thing is though, for SD, you can go upto DVCPRO50 using internal SATA drives, and you only start to drop frames when the edit gets BIG. But, even with an external drive, you can still get dropped frames, as you are accessing all this data from several places on a single device.
To do ANY uncompressed 8bit or 10bit editing you HAVE to have at least 4 drives in a raid array, otherwise you will get dropped frames constantly.
Im sure you can get firewire raid arrays, but your pushing the limits of firewire, and it means that you could be limited on your capture devices.
You can also get SCSI raid arrays, but I think there just too expensive, and SCSI versions are constantly being superseded. + the cable distance is short, and you have to worry about terminating etc..
In terms of fibre channel, the Xserve raid does seem expesive, but compared to any other fibre channel raid, its the cheapest by far.