- Entry:
- CFAL
- VIT option:
- CFS
- Event:
- Invocation of the MVS™ macro IXLALTER
- VIT processing module:
- ISTRACCF
- Control is returned to:
- ISTFSUAL
This trace entry is written when the IXLALTER macro is
used to: 
- Initiate an alter of the coupling facility storage attributes
- Stop an alter in progress of the coupling facility storage
- Byte (hex)
- Contents
- 00–03
- Record ID: C"CFAL"
- 04
- ID is the primary address space ID (ASID). This field is 0 if the ASID is greater than X'FF'.
- 05
- 0
- 06
- Function request by this invocation of IXLALTER:
- Bit
- Meaning
- X'01'
- REQUEST(START) to start the alter process.
- X'02'
- REQUEST(STOP) stop the alter process.
- 07
- Event flags
- Bit
- Meaning
- 1... ....
- Request that the size of the coupling facility structure be changed.
- .1.. ....
- Request that the entry-to-element ratio for a coupling facility structure be changed.
- ..xx xxxx
- 0
- 08–0B
- Structure object (CFSSTR) address.
- 0C–0F
- 0
- 10–13
- Return address of the invoker of the utility module.
- 14–17
- Return code from the MVS macro IXLALTER. See z/OS MVS Programming: Sysplex Services Reference for an explanation of this code.
- 18–1B
- Reason code from the MVS macro IXLALTER. See z/OS MVS Programming: Sysplex Services Reference for an explanation of this code.
- 1C–1F
- Request parameter header (RPH) address.