Layout of channel initiator SMF type 116 records

The layout of channel accounting data (SMF type 116, subtype 10) records is described in this topic.

Self-defining section

The self-defining section for the channel accounting data follows the standard SMF header. It is structured in the standard triplet format. The format of the triplets is described in structure qws5 in the C programming language header file thlqual.SCSQC370(CSQDSMFC), and in assembler macro thlqual.SCSQMACS(CSQDQWS5).

Table 1 shows the format of the self-defining section.

Offset: Dec	Offset: Hex	Type	Length	Name	Description
0	0	Integer	4	QWS50PSO	Offset from the start of the SMF record to the first instrumentation standard header (QWHS)
4	4	Integer	2	QWS50PSL	Length of the QWHS
6	6	Integer	2	QWS50PSN	Number of instances of QWHS
8	8	Integer	4	QWS50R1O	Offset from the start of the SMF record to the first channel accounting data record (QCST)
12	C	Integer	2	QWS50R1L	Length of the QCST
14	E	Integer	2	QWS50R1N	Number of instances of QCST

Instrumentation standard header (QWHS)

The format of the QWHS is described in structure qwhs in the C programming language header file thlqual.SCSQC370(CSQDSMFC), and in assembler macro thlqual.SCSQMACS(CSQDQWHS). It contains the following key fields that are relevant to channel initiator SMF 116 records:

Name	Length	Description
QWHSNDA	1 byte	Number of self-defining sections
QWHSSSID	4 bytes	Subsystem name
QWHSSMFC	1 bit	Indicates whether there are multiple SMF records containing information for this interval. If this bit is on, information for this interval is continued in further SMF records. If this bit is off, this is the last or only record.
QWHSTIME	8 bytes	Local time of the start of the interval in STCK format
QWHSDURN	8 bytes	Duration from the start of the interval to the end of the interval in STCK format
QWHSSTCK	8 bytes	End of the interval in UTC in STCK format

Parent topic: Interpreting IBM MQ for z/OS accounting data