IXL163I

Explanation
Coupling thin interrupts which provides for improved
performance and throughput for coupling facility workloads is not
enabled (or not disabled) due to reasonnotenabled.
When COUPLINGTHININT is not enabled for system sysname,
the system will continue to process coupling related workloads as
efficiently as possible.
In the message text:
action 
ENABLED
The system attempted to enable coupling thin interrupts in the
channel subsystem.

DISABLED
The system attempted to disable coupling thin interrupts in the
channel subsystem.

sysname
The system where coupling thin interrupts is not enabled or disabled.
reasonnotenabled
CHANNEL SUBSYSTEM CALL FAILED
A channel subsystem call (CHSC) command to enable or disable coupling
thin interrupts has failed.

COUPLINGTHININT FUNCTION DISABLED
The COUPLINGTHININT modifiable optional function is currently
disabled by the installation. The system can not enable coupling thin
interrupts for the system because the installation has disabled the
COUPLINGTHININT function by specifying DISABLE(COUPLINGTHININT) either
on the COUPLExx parmlib member FUNCTIONS statement or on a SETXCF
FUNCTIONS command. Refer to z/OS MVS Setting Up a Sysplex for
a description of the COUPLINGTHININT function.

INTERRUPT HANDLER NOT REGISTERED
A call to IOS Adapter Services to register a coupling interrupt
handler has failed.

diagdata
Diagnostic data to help determine the cause of the service failure.

System action
The system continues processing without the ability
to use coupling thin interrupts to process coupling workloads if enablement
was requested or continues processing with coupling thin interrupts
if disablement was requested.

Operator response
None.

System programmer response
If reasonnotenabled indicates
that coupling thin interrupts was not enabled because the installation
has disabled the COUPLINGTHININT function and enablement is desired,
then enable the COUPLINGTHININT function using the SETXCF FUNCTIONS
operator command. The system will begin exploiting coupling thin interrupts
(subject to the establishment of any other prerequisites that may
be required).
If reasonnotenabled indicates
another reason for why coupling thin interrupts was not enabled or
disabled and you have coupling facilities in your configuration, record
the reason code (reasonnotenabled) and contact
IBM software and/or hardware support. If you do not have coupling
facilities in your configuration, you can ignore this message.

Source
Cross System Extended Services (XES)

Module
IXLLI1SIN, IXLE1CRW

Routing code
2,10

Descriptor code
12