Visara CNA-8000 Installation - Manual (Page 57)

CNA-8000 Installation and Configuration
707158-003 4-1
Chapter 4. ESCON/FICON XCA Configuration
A CU on the CNA-8000 can be thought of as a logical Control Unit image. Each CU
corresponds to a CTRLUNIT macro in the IOCDS gen, and is tied to a specific LPAR. If
a CTRLUNIT macro is being shared by more than one LPAR in the IO gen, one CU
definition for each of the LPARs actively sharing the CNTLUNIT macro is required on
the CNA-8000. The CNA-8000 supports up to 16 CU images per ESCON or FICON
interface. Each CU can have multiple subchannels determined by the address range
defined in the CTRLUNIT statement. Each subchannel can be used to define an XCA
portal. There is a maximum of 256 subchannels per ESCON or FICON interface allowed,
but there is a further limitation of a maximum of 8 XCA portals defined to each network
interface card (Token Ring or Ethernet). Note that a single IODEVICE macro can specify
multiple subchannels, with each subchannel being a separate XCA portal.
To define and configure CUs on the CNA-8000, select the [Connectivity] button from the
Configuration menu.