Visara CNA-8000 Planning Guide - Manual (Page 22)

Chapter 2. Support of PU 2 Platforms
2-8 707156-002
IOCDS Gen Requirements
A single subchannel is required for each XCA definition associated with the CNA-8000.
Each XCA definition describes a data pipe between an ESCON or FICON interface and a
single network adapter in the CNA-8000. A unit type of 3172 is typically used to define
the FEP-4600 for an XCA definition in the ESCON environment. For the FICON
environment, since the 3172 was never implemented to work there, you must use a value
of ‘NOCHECK’ in the CNTLUNIT macro to make the system happy.
Each XCA definition is good for supporting up to 255 DSPUs concurrently. If more than
255 DSPUs need to connect through a single adapter on the CNA-8000, then it might be
necessary to define multiple XCA definitions to communicate with the same adapter. Up
to eight XCA definitions may be defined to each network adapter on the CNA-8000
providing support for up to 2040 DSPUs. Note that your CNA-8000 may require an
optional sales feature to support more than 2040 DSPUs.
An example IOCDS definition for use by the CNA-8000 is shown below. This definition
would provide support for a single XCA definition for use by a single LPAR (PROD1).
RESOURCE PARTITION=((PROD1,1),(TEST,3))
CHPID PATH=(1F),TYPE=CNC,SWITCH=01,SHARED
CNTLUNIT CUNUMBR=1400,PATH=1F,UNITADD=((00,1)),UNIT=3172,LINK=C5
IODEVICE CUNUMBR=1400,ADDRESS=(640,1)UNIT=3172,UNITADD=00,PARTITION=(PROD1)
A similar definition that would support multiple XCA definitions (4) to either a single
CNA-8000 network adapter or to multiple network adapters would look like this:
RESOURCE PARTITION=((PROD1,1),(TEST,3))
CHPID PATH=(1F),TYPE=CNC,SWITCH=01,SHARED
CNTLUNIT CUNUMBR=1400,PATH=1F,UNITADD=((00, 4 )),UNIT=3172,LINK=C5
IODEVICE CUNUMBR=1400,ADDRESS=(640, 4 )UNIT=3172,UNITADD=00,PARTITION=(PROD1)
Yet another example where XCA gateways will be defined in both LPARs sharing the
CHPID would look similar to the definition below. Note that PARTITION parameter is
missing from the IODEVICE statement (since all partitions have the same CUNUMBR
and device ADDRESS definitions). In the CNA-8000 it is necessary to configure a CU to
talk to each of the LPARs (they are treated as the separate connections that they are).