ESCON Configuration 17
Channel Link – The address of the ESCON director port that connects to the
mainframe this device is to communicate with. The value range is from 01-FE
hexadecimal. In Figure 4-2 the mainframe uses a channel link address '02' to
communicate with Server 1. Server 1 uses a channel link address '01' to
communicate with the mainframe. In this example, the Channel Link in the
adapter configuration is set to '01'.
Figure 4-2. Channel Link Address
If no director is used, the channel sub-system will assign an arbitrary LINK
address (usually 01) for the server to communicate with the mainframe. To
ensure the mainframe always selects '01' you should assign '02' to the channel
adapter’s device in the IOCDS. Code the LINK parameter in the CNTLUNIT
macro in the I/O Configuration Data Set (IOCDS) to '02' as shown in the
following example:
CNTLUNIT ...,LINK=(02),....
Then set the channel link '01' in the adapter's configuration.
Logical Partition Address (LPARS) – This is a hexadecimal number ranging
from 0-F identifying the logical partition (LPAR) ID of the Logical partition this
connection is to communicate with. This parameter is only required if EMIF is
enabled. For BASIC mode or LPAR mode non-EMIF, set this field to zero (0). If
EMIF is enabled this number must match the LPAR ID assigned in the Logical
Partition Definition (LPDEF) frame which appears in LPAR mode after a power
on / reset. In LPAR mode the CPU ID contains this number as it's fourth
character. If running the VM operating system, the "QUERY CPUID" command
will display the CPU ID. The fourth character of the CPU ID is the LPAR ID.
The remainder of this chapter discusses how to modify the configuration parameters
for your PCI ESCON Adapter.
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