SMF Record Interval Recording Specification
The SMF type 30 record supports interval recording.
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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 the Interval Recording section.