esata

[Stephen Adler]

Does one need a special port multiplex aware set of disk drives? and a 
port multiplex controller? Or does standard sata controllers support 
port multiplexing?

Dan Ritter wrote:
> 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.
>
> -dsr-
>
>