WLMSED reporting on SEDPCIUS often more than 100%

Products

• MICS Resource Management

Issue/Introduction

I am analyzing the WLMSED data for delays and have noticed that the SEDPCIUS: Percent Using I/O seems to often be more than 100%. I have attached a printout of the data for reference. Please could someone let me know why we are seeing this when the value should never be above 100% according to the documentation.

Environment

Release : 14.2

Component : CA MICS BASE SET

Cause

Data element SEDPCIUS - Pct Using I/O occassionally shows values exceeding 100%.  The root cause of the problem is that data element SEDTOSST - Total Sampled States, which is the denominator used in the equation to calculate SEDPCIUS, can be understated when the following three conditions are met:

   1) Data element SEDTOUSE - Total WLM Usings contains a value of zero.                                     
                                                        
   2) Data element SEDTOIUS - Total WLM I/O Usings or data element SEDTODSD - DASD I/O Delay contains a non-zero value.                                                                                            
   3) WLM Management of Service Classes does not use I/O Priority Management.

When all three conditions are true, SEDTOSST will contain a lower value than it should.  There are a total of 38 "Percent" data elements that use SEDTOSST as the denominator in the "Percent" equation, so the values of these other "Percent" data elements (names are SEDPC***) are impacted as well.

SYMPTOMS
SECPCIUS contains a value greater than 100%.

IMPACT
Reports and analysis of Service and Report Class "Percent" data element values in the WLMSED and WLM_ED files is innacurate for observations where SECTOSST is understated.

CIRCUMVENTION
None

Resolution

Product Change RMF7157 - Data Element SEDPCIUS Value Exceeds 100%