Please bear with me; I never had to dig into this detail on step end EXCP SMF reporting.
I'm analysing a perfomance issue with long running (35 hours) a batch job. Looking at JESYSMSG, I stumbled across information that our IEFACTRT exit writes at step end. There is one step that seamed to do millions of I/Os against STEPLIB. STEPLIB is a two DSN concatenation, however, I see dozens of STEPLIB related I/O numbers.... Trying to understand, I started to have a detailed look at the SMF 30 records for the step. We do have interval recording, so I can see one subtype 1, a bunch of subtype 2, followed by one subtype 3 for the lat interval, and finally 1 subtype 4 records at the end of the step. Q1: The I/O counts in the interval records are *not* cumultive, but reflect the count since the previous record has been cut, correct? This is how I read the doc. Q2: The EXCP information that was written to the interval records is repeated in the step end record, correct? Q3: IEFACTRT will only see subtype 4 records, correct? Q4: If Q1-Q3 are correct, this explains why IEFACTRT listing I/Os by DDname and device can shoe dozens or hundreds of EXCP numbers for a two DSN STEPLIB. Thanks for confirmation or correction where due. -- Peter Hunkeler ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
