On Thursday, 05/27/2010 at 01:34 EDT, Mark Pace <mpac...@gmail.com> wrote: > I'm confused. > The DFSMS program directory has a note > Critical Information > The 500 & 5FF minidisk must be 3380 dasd. Emphasis IBM's. > mdisk 0500 3380 001 001 $$$$$$ MR > mdisk 0500 3380 001 001 $$$$$$ MR > > Yet the sample directory entries provided in VSM221B PLANINFO have 3390 as the > devtype. > mdisk 0500 3390 001 001 $$$$$$ MR > mdisk 0500 3390 001 001 $$$$$$ MR > > Is the program directory incorrect or is the provided sample incorrect? Does > it really matter?
Yes, it matters. In order for CP to instantiate a minidisk, the vdev type must match the rdev type. I suspect that the 'must be 3380' is really 'must be modern ECKD that supports the stuff I need'. While not relevant in this particular case, the device type on the MDISK tells DIRECTXA what the highest cylinder number is for that volume (remembering that the volumes are not necessarily available to DIRECTXA when it is being run). Alan Altmark z/VM Development IBM Endicott
