Visara FEP-4600 Planning Guide User Manual

Page 84

Chapter 7. NULL SNI Networks

7-4

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Null SNI IOCDS Gen Requirements for the Local Host

At the IOCDS level, there is no knowledge of SNI or VTAM, so the gen requirements are
going to be the same as for any PU4 Channel-to-Channel connection. Each Explicit
Route that the FEP-4600 is to support into the null network requires a subchannel
assignment within an SCTC definition. This would include connections to multiple
remote 3745s, or multiple links to the same 3745. Furthermore, if more than one SSCP
(VTAM) is to have a direct connection to the FEP-4600, then a separate SCTC definition
through a separate CHPID must be made in the gen to accommodate each of the LPARs
supporting the SSCPs. Reference the following definition examples.

Example 1:

In this example the LPARs 1 (PRODA) and 3 (PRODC) are interconnected with a CTC
connection. And although EMIF is used to share CHPID 1F between LPARs 1 and 3, for
this example only LPAR3 has a connection to the FEP-4600. (The configuration of the
FEP-4600 is used to deny LPAR 1 access to the FEP-4600. In this example the IOCDS
also implies denied access using the Explicit Device Candidate List, by specifying with
the PARTITION parameter which LPARs have access.)

RESOURCE PARTITION=((PRODA,1),(PRODC,3))

CHPID PATH=(1F),TYPE=CNC,SWITCH=03,SHARED

CNTLUNIT CUNUMBR=1F00,PATH=1F,UNITADD=((00,1)),UNIT=SCTC,CUADD=0,LINK=C5

IODEVICE CUNUMBR=1F00,ADDRESS=(680,1)UNIT=SCTC,UNITADD=00,PARTITION=(PRODA)

On a processor that supports Logical Subsystems (such as the z990 or z9), the definitions
will look slightly different. Here is the same set of definitions as would be seen for the
z990 if these LPARs are in CSS0.

RESOURCE PARTITION=(CSS(0),(PRODA,1),(PRODC,3))

CHPID PATH=(CSS(0),1F),TYPE=CNC,SWITCH=03,PCHID=374,PART=(PRODA,PRODC),SHARED

CNTLUNIT CUNUMBR=1F00,PATH=(CSS(0),1F),UNITADD=((00,1)),UNIT=SCTC,LINK=(CSS(0),C5)

IODEVICE CUNUMBR=1F00,ADDRESS=(680,1)UNIT=SCTC,UNITADD=00,PARTITION=(CSS(0),PRODA)

FEP-4600

CTC

PRODA

LPAR1

PRODC

LPAR3

Remote Network

CPU

SW03