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On Thu, Nov 19, 2009 at 02:38:22PM -0500, Stephen Adler wrote:
> Something tells me that the port multiplexer will degrade the 
> performance of your disk array. Is this of any real concern?

SATA is rated at 1.5 or 3 Gb/s *; if this is a bottleneck for all
the disks behind it, then yes. Otherwise, no.

If the server is connected by 1 gigabit ethernet, for instance,
it really isn't likely that the port multiplexer is the problem.
Similarly, if you have 4 disks behind a 3Gb/s port multiplier, even
with all of them active, you would have to have simultaneous
cache hits on all the disks for this to be an issue...

*and I believe 6 just came out, but it's labelled SATA2.


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