Re: twinax speed on i5 520

[Larry Bolhuis <lbolhuis@xxxxxxxxxx>]

Well your first problem is you have your twinax stuff hooked up to a 
SCSI tape controller :-)

Making the wild #ss assumption that you meant 2746 instead, your problem 
likely is that the two systems cannot both use the MUX at once. It's a 
long story of polling and timing but you have two devices (830 and 520) 
whose twinax cards are not synchronized, nor can they be. It's possible 
that the mux is 4x4 in other words you could split the ports four to 
each system. You could prove that with a little testing. You may also be 
able to tell by looking at which ports the devices are dropping on. If 
it's only ports 0, 2, and 3 then this is likely true.

In the mean time.this ain't gonna work as configured.

- Larry

Jerry Draper wrote:
> I created a data area to deal with the twinax enhancement issues:
>
> crtdtaara dtaara(QSYS/CTL02) type(*char) value('FFFFFF')
>
> Devices are dropping left and right.
>
> My topology is:
>
> 830 twinax 2749 card to NBase fiber mux to workstations on ports 0,2,3,4,5,7.
> i5 520 twinax 2749 card to NBase fiber mux to workstations on port 0
>
> We are talking the same fiber mux here.
>
> When the i5 is connected twinax devices on the 830 start dropping.
>
> Jerry
>
>
> Quoting Jerry Draper <midrangel@xxxxxxxxxxxxx>:
>
>   
> > I'm wondering what the default speed is for a twinax controller on the i5
> > 520.
> >
> > I remember that IBM doubled twinax speed and added compression to make it
> > faster.  
> >
> > I remember that there was a data area that forced the controller back to the
> > old
> > speed/compression so as to work with older equipment.
> >
> > Anyone know?
> >
> > Jerry Draper
> >