Mainview SRM Allocation SPACSECI parameters and behavior

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    PRODUCT:

    MainView SRM Allocation


    APPLIES TO:

    MainView SRM Allocation 7.9, Mainview SRM StopX37/II 7.9 with BPG7632 applied



    QUESTION:

     
       How do the new parameters (    PCTIACT & PCTICALC) for SPACSECI affect its behavior?  


    ANSWER:

    To understand the differences in behavior between the various parameters it may be most helpful to discuss them all, and illustrate them.
    Please note: the documentation describes the SPACSECI value in cardinal numbers, starting from the number 1.  The messages generated by MVSRM, as seen when using "//PROTRACE DD DUMMY" in the step in question, shows z/OS systems identifying extents starting from zero.  Numbering of extents can also be verified using IBM's IEHLIST program. Examples of trace results are below.

    SPACSECI   Specifies the last extent to receive the original secondary space allocation quantity.  After the specified extent, the secondary allocation is increased.  With SPACSECI=4, it is the 5th extent where the SPACSECI Function begins to take effect.

      Example SPACESECI=4  
      
    PCTI              Specifies the percentage value by which a secondary allocation is increased or decreased.   
      Example PCTI=200  this is means 200%, or 2x or doubled. 
      
      PCTI is also available in other functions 
      
    PCTIACT (new with BPG7632)     Specifies when the percent increase calculation for the secondary extent is activated (All extents starting with the second one, or else the SPACESECI number) 
               Example PCTIACT=A/S  Valid values: A for all extents starting with the second one, or S for secondary value  
      Parameter is available only in SPACSECI function 
      
    PCTICALC (new with BPG7632)   Specifies the number of times the percent increase calculation is applied to the secondary extent before becoming constant 
               Example PCTICALC=nn  
      Parameter is available only in SPACSECI function 
      
    Examples below assume this space allocation in the JCL:  
               SPACE=(TRK,(1,10)) 
                                                                                                                                                                                                               
       SPACSECI=4  
    Secondary allocation increase occurs after the SPACSECI value. Extent increases by secondary value for each extent thereafter.  
    Extent number in 
    cardinal numbers
    12345678910
    Extent number in
    zero-based numbers
    0123456789
    Allocation per
    extent
    1101010203040506070
       
                                                                                                                                                                                                               
       SPACSECI=4 PCTI=200  
    Ignores SPACESECI value when PCTI is defined (starts at second extent), increases the extent value once by percentage specified, then constant.  
    Extent number in 
    cardinal numbers
    12345678910
    Extent number in
    zero-based numbers
    0123456789
    Allocation per extent1202020202020202020
      
                                                                                                                                                                                                               
       SPACSECI=4 PCTI=200 PCTIACT=S  
    Enables honoring SPACSECI value when PCTI is used; increases the extent value once by percentage specified after the extent number specified, then constant.  
    Extent number in 
    cardinal numbers
    12345678910
    Extent number in
    zero-based numbers
    0123456789
    Allocation per extent1101010202020202020
      
                                                                                                                                                                                                               
       SPACSECI=4 PCTI=200 PCTIACT=A  
    Ignores SPACESECI value when PCTI is defined (starts at second extent), increases the extent value once by percentage specified, then constant.  Same result as SPACSECI=4 PCTI=200  
    Extent number in 
    cardinal numbers
    12345678910
    Extent number in
    zero-based numbers
    0123456789
    Allocation per extent1202020202020202020
                                                                                                                                                                                                               
       SPACSECI=4 PCTI=200 PCTIACT=S PCTICALC=3  
    Honors the SPACSECI value and increases by PCTI value repeatedly, for the PCTICALC number of extents before becoming constant.  
    Extent number in 
    cardinal numbers
    12345678910
    Extent number in
    zero-based numbers
    0123456789
    Allocation per extent1101010204080808080
      
       
                         
                     SPACSECI=4 PCTI=200 PCTIACT=A PCTICALC=3
            Ignores the SPACSECI value, and increases by PCTI value repeatedly, starting in the 
            2nd extent, for the PCTICALC number of extents before becoming constant.                                                                                                                                                                                                       
    Extent number in 
    cardinal numbers
    12345678910
    Extent number in
    zero-based numbers
    0123456789
    Allocation per extent120408080 8080808080
      
    Example trace display excerpts of SPACSECI taking action, note the extent number at the end of the SVM message:

    SVM0042I TRACE +SET RLST  SET SPACSECI=4
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST1.E, BXXW03,   4
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 20                                              
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST1.E, BXXW03,   5
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 30                                              
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST1.E, BXXW03,   6
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 40                                              
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST1.E, BXXW03,   7
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 50                                              
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST1.E, BXXW03,   8
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 60         

    SVM0042I TRACE +SET RLST  SET SPACSECI=4 PCTI=200 
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST2.E, BXXW10,  
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 20                                               
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST2.E, BXXW10,  
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 20                                               
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST2.E, BXXW10,   3
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 20                                              
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST2.E, BXXW10,  
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 20                                               
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST2.E, BXXW10,   5
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 20                                              
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST2.E, BXXW10,   6  
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 20                                               
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST2.E, BXXW10,   7
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 20                                              
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST2.E, BXXW10,  
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 20                                               
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST2.E, BXXW10,   9  
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 20           

    SVM0042I TRACE +SET RLST    SET SPACSECI=4 PCTI=200 PCTIACT=A
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST4.E, BXXW11,   1  
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 20                                               
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST4.E, BXXW11,  
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 20                                               
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST4.E, BXXW11,  
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 20                                               
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST4.E, BXXW11,   4  
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 20                                               
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST4.E, BXXW11,   5  
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 20                                               
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST4.E, BXXW11,   6  
    SVM4874I INCREASED SPACE FROM  10 TRKS TO 20                                               
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST4.E, BXXW11,   7  
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 20                                               
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST4.E, BXXW11,   8
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 20                                              
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST4.E, BXXW11,   9  
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 20                                               
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST4.E, BXXW11,   10
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 20                                               
        
    SVM0042I TRACE +SET RLST  SET SPACSECI=4 PCTI=200 PCTIACT=S PCTICALC=3    
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST5.E, BXXW07,   4  
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 20                                               
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST5.E, BXXW07,   5
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 40                                              
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST5.E, BXXW07,   6
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 80                                              
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST5.E, BXXW07,  
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 80           

    SVM0042I TRACE +SET RLST  SET SPACSECI=4 PCTI=200 PCTIACT=A PCTICALC=3  
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST6.E, BXXW01,  1
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 20                                              
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST6.E, BXXW01,   2
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 40                                              
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST6.E, BXXW01,   3
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 80                                              
    SVM4000I LXLSECI, STEPA, SORTOUT, ATTEMPTING SPACSECI FOR BMCLXL.SECI.TEST6.E, BXXW01,  4
    SVM4874I INCREASED SPACE FROM   10 TRKS TO 80                                             
      

     


    Article Number:

    000166148


    Article Type:

    FAQ/Procedural



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