W dniu 2011-10-05 16:15, MONTERO ROMERO, ENRIQUE ELOI pisze:
Hi to all,
is it possible to define device addresses over the 4 dev address?
I mean, the limit address of a device is FFFF, so what happens when need to
define more devices?, can be defined 5 chars address devices (FFFFF) ?
There is no simple YES/NO answer.
Generally speaking, NO device adresses are 4-digits.
However since times of z9 machine and (AFAIK) zOS 1.7 t's possible to
move 3390A aliases to "another cosmos" leaving more addresses for
regular devices. It's called MSS - multiple subchannel set. Nowadays
it's also possible to use MSS1 for PPRC secondary devices (AFAIK new
device types in HCD dialogs).
What happens when you reach the limit? You HAVE A PROBLEM!
Possible solutions:
1. Move aliases to MSS1. That should relieve the constraint.
2. Use less aliases. Not so stupid, when you also start using HyperPAV.
3. Use bigger device types. Vast majority of devices are disks. You can
have plenty of 3390-3, or plenty/3 of 3390-9 or less "3390-54", or quite
few EAV devices.
4. Use duplicate device addresses. This is solution for multiple CPCs
NOT SHARING all the disks. Example: CPC A is connected to DASD1 and
DASD2. CPC B is connected to DASD1 and DASD3. So, DASD2 and 3 can be
addressed using the same device numbers.
BTW: Do you really have such problem?
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