3590 is ALWAYS SCSI attached.  A 3590 attached to a mainframe via ESCON is 
really
using an A00 controller in between, which is really an RS/6000 (C20?) with a 
SCSI
F/W differential card to attach the 3590 and an ESCON card to uplink to the
mainframe, with some custom software running on AIX to make it behave like a
mainframe controller.

Cheers...
Bruce

Steven P Roder wrote:

> >    We're contemplating adding an RS/6000 ADSM server to our backup scheme.
> > We have a 3590 shared between our MVS and VM systems via ESCON.  Is anyone
> > else sharing a 3590 between a mainframe system and an RS/6000?  What method
> > of connectivity (SCSI, ESCON) is being used from the RS/6000 to the 3590?
>
> Hi Arty,
>
>      We are about to buy a 3494 with 8 3590 drives, 4 of which will be
> ESCON attached for VM/MVS, and the other four will be SCSI attached to an
> RS/6000-F50 for ADSM.  My understanding is that the 3590 is either ESCON
> or SCSI, and not "both".
>
> Can you put an ESCON card in an RS/6000?  I guess if you could that might
> muddy the waters, but you would need some way of "sharing" the drive with
> all three environments, like MIM...
>
> Steve (unVMix Systems Programmer/Dude) Roder
> (tkssteve AT ubvm.cc.buffalo DOT edu | tkssteve AT acsu.buffalo DOT edu | 
> (716)645-3564 ,
>    | http://ubvm.cc.buffalo.edu/~tkssteve)

--
Bruce Elrick, Ph.D.
Bruce Elrick, Ph.D.
mailto:belrick AT home DOT com
http://members.home.net/belrick/