Peter, Do you have SAS and MXG at your shop? If so, then the MXG.SOURCLIB will have information on what you are looking at.
Lizette > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] > On Behalf Of Peter Hunkeler > Sent: Wednesday, June 03, 2015 5:28 AM > To: [email protected] > Subject: Is EXCP data from SMF 30 interval records repeated in step end > records? > > 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
