Re: twinax speed on i5 520

Yup.  It's a 2746.  The rest is a bummer.

Thanks.

Jerry

Quoting 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
> >>     
> 
> 
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