6. DATA SOURCES › 6.2 Data Collector and Processing Considerations › 6.2.1 SMF Recording Options › 6.2.1.3 SMF Record Interval Recording Specification

6.2.1.3 SMF Record Interval Recording Specification

The SMF type 30 record supports interval recording.  In
SYS1.PARMLIB(SMFPRMxx), the INTERVAL/NOINTERVAL option of the
SYS or SUBSYS parameter is used to invoke interval recording
and to specify the interval time value.  If interval
recording is specified in the SYS parameter, then all
subsystems that generate type 30 records will use the
interval time value specified, unless overridden by an
INTERVAL/NOINTERVAL option specified in a SUBSYS parameter.

With global synchronized interval recording, an interval
value may be specified in SYS1.PARMLIB(SMFPRMxx) using the
INTVAL parameter.  This recording interval, unlike the
INTERVAL value specified as a SYS or SUBSYS parameter, is
available for use by requestors other than SMF, for example
RMF.

In conjunction with the INTVAL parameter, the SYNCVAL
parameter value is used to synchronize the end time of all
intervals.  The SYNCVAL value is specified as a number
between 00 and 59 and instructs SMF to generate interval
records at that minute past each hour.  If the interval time
is less than an hour, SMF generates records at the
appropriate minutes past each hour so that synchronization is
maintained.  For example, if an INTVAL value is 30 minutes,
and the SYNCVAL value is 59, then intervals for each address
space end at 29 and 59 minutes past each hour.

Instructions for customizing SMF interval recording may be
found in the System Management Facilities (SMF) manual for
the MVS version running at your site.

More information about interval accounting is presented in
Section 6.3.2, Interval Recording.