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MICS and RMF interval settings

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Article ID: 189167

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Updated On:

Products

MICS Resource Management

Issue/Introduction

I am performing some research regarding the alignment about the record interval for RMF and MICS.

Is there a parameter on MICS that could be aligned with RMF "SYNC(RMF,15M)" ?

I'm wanting to know if there is a MICS parameter aligned to SYNC.

 

Environment

Release : 14.2

Component : CA MICS

Resolution

Knowledge article # 51126 reviews the RMF Monitor SYNC(nn) parameter and how it can be used to specify whether or not RMF intervals are to be synchronized with the hour of the day, and, if so, the number of minutes after the hour when synchronization is to occur.

 There is not a MICS parameter related to RMF interval.  MICS simply processes the data generated by SMF/RMF. 

We do, however, STRONGLY recommend that the RMF SYNCVALvalue be set to 59.  This is because of MICS summarization--and the fact that MICS uses the ENDTS (End timestamp) value to determine MICS common data elements like HOUR.

If you were to use a an RMF SYNCVAL value of 00, for example, and 15 minute interval records, for the 8 a.m.hour, you would have intervals that ended at 8:15, 8:30, 8:45, and 9:00.  These four intervals logically contain the data for hour 8.  In the MICS DETAIL timespan records, there would be no problem--each record would contain 15 minutes of data.

The problem occurs when we summarize to the MICS DAYS timespan---in this case, the data in the DAYS timespan for hour 8 would NOT contain the last interval above, because we use ENDTS, and the last interval ended at 9:00--so the hour value would be 9--not 8.

The DAYS timespan record for hour 8 would actually contain data from 7:45 to 8:45 (because the interval starting at 7:45 ended at 8:00 a.m. (hour 8).  

That is why it is very important to use a SYNCVAL of 59---this means that with 15 minute intervals, you would have intervals ending at 8:14, 8:29, 8:44, and 8:59---(where the 1st interval started at 7:59 (almost 8)).

So--with SYNCVAL 59, MICS interval records summarized to the DAYS timespan are only off by 1 minute off from truly representing the HOUR specified in the DAYS database records.  (basically 7:59 - 8:59 is the actual data).

Additional Information

In an earlier comment, I kept referring to the IBM RMF "SYNCVAL(nn)" parameter.  This parameter is specified in the SYS1.PARMLIB(SMFPRMxx) member for each z/OS LPAR.  The other related parameter in this same member is the INTVAL(nn) parameter, where you specify the interval length.  

One final comment---for RMF specifically, in the SYS1.PARMLIB(ERBRMFnn) member, we recommend that you specify SYNC(SMF), which tells RMF to use the same INTVAL and SYNCVAL values that are specified in the SMFPRM00 member.