Addonics SIS3124 Controller and T

[Jose Amengual]

On 2011-02-08, at 6:47 PM, dieterbsd at engineer.com wrote:

> Jose Amengual writes:
>> 1.- I can see just only from ada0 to ada6 I don't see any other HDs.
> 
> Are both of the JMB393s configured as individual drives port multiplier
> mode? (as opposed to some hardware raid mode)  I assume you've already
> checked the cables.
Strangely enough just switching drives now I can see all ten, weird but is working now.

I'm confused why you are referring to a JMB393s if my card has a siis3124 chip....or are you referring o the PMs?

> 
>> 2.- Performance is just 131 MBs per second as report from diskinfo -t
> 
> This is for an individual drive, correct?  
> How fast do you expect it to
> be?
This was for an individual drive.

I was expecting more but it looks like I was wrong with my assumptions. 

> 
> Have you tried connecting individual drives to the 3124 controller
> and tested the performance that way?
I didn't try this, I will do that.


> 
>> From what you've written, the bottleneck could be the controller, the
> port multiplier, or the drive itself.  131 MB/s sounds about right
> for a single drive, unless it is some super high performance drive
> or you are reading from the drive's RAM rather than from the platters.
> I can get 253 MB/s reading from a drive's RAM.  Useful for seeing what
> controllers, port multipliers and such can do without the limits of
> the platter density.  (the platter density goes up as new generations
> of drives come out)  I'd be interested in knowing what the 3124
> controller and the JMB393 PM can do.
> 
> 
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