Information Systems:Monitoring system performance on IBM i

Performance monitoring

Collection Services

http://www-01.ibm.com/support/knowledgecenter/ssw_ibm_i_61/rzahx/rzahxcollectdatacs.htm

Collects system management data in a management collection object (*MGTCOL) in library QMPGDATA.

Our configuration is -

                     Configure Perf Collection (CFGPFRCOL)                     
                                                                               
Type choices, press Enter.                                                     
                                                                               
Default interval . . . . . . . .   15.00         *SAME, .25, .50, 1.0, 5.0...  
Collection library . . . . . . .   QMPGDATA      Name, *SAME                   
Default collection profile . . .   *STANDARDP    *SAME, *MINIMUM, *STANDARD... 
Cycle time . . . . . . . . . . .   000000        Time, *SAME                   
Cycle interval . . . . . . . . .   24            *SAME, 1-24 hours             
Collection retention period:                                                   
  Number of units  . . . . . . .   00024         *SAME, 1-720, *PERM           
  Unit of time . . . . . . . . .   *HOURS        *HOURS, *DAYS                 
Create database files  . . . . .   *YES          *SAME, *YES, *NO              

Our performance is collected at 15 minute intervals. Collection lasts for 24 hours. The collection object is kept for 24 hours. The information is written to the data bases as it is collected.

                         Work with Objects Using PDM                  BART     
                                                                               
Library . . . . .   QMPGDATA         Position to . . . . . . . .               
                                     Position to type  . . . . .               
                                                                               
Type options, press Enter.                                                     
  2=Change       3=Copy        4=Delete      5=Display       7=Rename          
  8=Display description        9=Save       10=Restore      11=Move ...        
                                                                               
Opt  Object      Type        Size        Text                                  
     Q083000045  *MGTCOL      221458432                                        
     Q084000049  *MGTCOL      194449408                                        

Q083000045 was created yesterday just after midnight, and collected data for 24 hours. Q084000049 was created just after midnight today, and is still collecting.

‘83’ and ‘84’ are the numbers of the day in this year; 45 and 49 was the time the collector was created (ie 00:00:45).

Archive Performance Data

Every night at 10 minutes to midnight, the performance data is appended to our data files. We do this because collection services builds a new member every time it starts; which makes it difficult for us to use the data.

The program that runs is WEBPRDP/PMGETDATA, which appends data for the current day into files in WEBPRDD. (They are named PMCPU, PMDISK, PMDOMINO, and PMPOOL.)

View Performance Data in InfoNet

Go to InfoNet / I.T. / Performance Data.

There are two options. 'By time' shows performance up to last night (when PMGETDATA copies data into our files). 'Today' copies data from the collectors into temporary work files, and will show data up to 15 minutes ago.