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Unread postby Stonent » Mon Aug 04, 2003 5:17 pm

SCSI disconnect bypasses the problem. If you had a u160 controller, a u160 drive and a u80 drive, then it could work at u160 speeds when talking to the u160 drive.
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Unread postby max_impact » Tue Aug 05, 2003 3:59 pm

DaJuice wrote:Thanks for all the info, good reading. What about Fibre Channel? Would using a U160 PCI card offer better performance than using the 1GB Fibre Channel XIO boards?

Fibre channel really is a different ball game, not least because the devices tend to be a little more on the pricey side.

Personally, I've encountered numerous problems with SCSI with noisy devices or too many devices making the total length of cabling so long that devices don't play well (or at all) and the performance of the bus slows to a crawl.

Fibre channel is not without its flaws (such as performance with lots of small blocks/files), but where it excels is in large installations or situations where you need to stretch out the cabling (fibre of course!) over much greater distances - since you can do this without loss of performance. Also, through the use of FC switches, you can reduce contention on the bus as some devices can be programmed to talk directly to one another without being routed through the host. FC also excels when large, sequential reads or writes are involved - you really *can* get close to the fibre rating (ie around 100MB/sec for 1Gb fibre).

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Unread postby DaJuice » Tue Aug 05, 2003 4:21 pm

Very interesting stuff, thanks a lot. :)

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