Micheal,
I'm still a bit confused? are you talking about the cu groups within the
USP, or CU definitions within HCD (ie CUADD=). Yes they are related, but
I dont understand what you mean by 'Logical CUs accessing the same
disk'. AFAIK each disk (ie 3390) is defined to only one CU image within
the USP (Ron correct me if I'm wrong)..
You mention different interfaces, Escon/Ficon, are you trying to say
that each set of interfaces sees a separate set of CU images that have
the same CUADDs, ie there are two separate CUADD=00, 1 for escon & 1 for
Ficon. Or do you mean that CUADD=00 is the same CU image for both Ficon
and Escon?
BTW the actual CU type defined in HCD doesnt really do anything except
allow HCD to perform constancy checking and feature filtering when you
define devices. As far as the HW goes, (ie the IOCDS) it is just mainly
description
Regards
Roy
Do you mean having two logical CUs in the USP, one 2105 one 3990,
accesing the same disk?
MP Reply:
Yes - this is what I mean. We see it happening like this:
a) It is a predefined control unit whether it be nn (00-1F) for ficon or
00-0F for escon (hard wired)
b) device type is still 3990
c) dasd subsystem knows device as 3390
d) Each cpu would have its own way of connecting to the disk subsystem..
whether it be via escon or ficon..so long as it uses only one access
method.
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