I hope the diagram below looks OK. Assume two boxes each with (at least)
one MVS and one ICF, all belonging to the same sysplex. Along with
internal connection to its 'local' ICF, each MVS needs an external
connection to the ICF in the other box. With ICF, you should also
implement system managed duplexing to guard against catastrophic failure
in a CEC, which would cause loss of structure data in the CF as well as
in-storage copies in the now dead MVS. This requires an ICF-ICF
connection.
The diagram illustrates three separate links. However, since all the links
connect LPARs in the same two boxes, there is an opportunity to EMIF the
physical links for multiple logical connections. In particular, the
ICF-ICF connection can use the same physical link as the MVS-ICF
connections.
We overlooked this possibility until Health Checker chided us for not
making full use of the links. HC detected that links were defined but not
included in all possible access lists. There should still be multiple
links for redundancy and performance of course, but the idea is to make as
many logical connections as possible out of the physical links.
CPU1 CPU2
| MVS |<======== | MVS |
| | --|----->| |
| | ! | | |
| | ! | | |
|-----| ! | |-----|
| ICF |<------ ======>| ICF |
| |<.............>| |
.
.
JO.Skip Robinson
Southern California Edison Company
SHARE MVS Program Co-Manager
626-302-7535 Office
323-715-0595 Mobile
[EMAIL PROTECTED]
IBM Mainframe Discussion List <[email protected]> wrote on 02/22/2006
08:23:49 AM:
> I have two CPUs. CPUH and CPUG. Each CPU has two mvs partitions and
> one ICF. In my example, CPUH has LPAR1, LPAR2, and COUPLE0H. When
> defining the CFP chpid on CPUH ( which will be used to communicate with
> CPUG), should COUPLE0H be in the partition access list. Or should it be
> defined like a CFS with only the MVS partitions in the access list.
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