On Wednesday, 07/01/2009 at 09:48 EDT, Vince Getgood <vincent.getg...@xchanging.com> wrote:
> I've just been making a Visio diagram of out I/O config on some old > hardware (z800), which runs two z/OS guests under VM (5.4) > > I dicovered that, although the VM IOCP has channels to my DASD system as > FC (FICON) the z/OS IOCP has them defined as CNC (ESCON). > > So what "speed" am I going to get on a z/OS I/O, ESCON or FICON? > > I'm assuming VM does something clever, like ignore what z/OS says? FICON, since CP doesn't care what the guest thinks about the subchannel, and all FICON/ESCON-style I/O is virtual. Alan Altmark z/VM Development IBM Endicott
