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PM43496: FILE MANAGER DVT USED EXCESSIVE CPU

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APAR status

  • Closed as program error.

Error description

  • File Manager DVT when accessing Format4 DSCB for a
non-conforming (eg. z/VM volume) or newly initialized VTOC
was using more CPU than necessary when searching for a user
specified data set.

Local fix

  • 



Problem summary


    

  • ****************************************************************
* USERS AFFECTED: File Manager Display Vtoc                    *
****************************************************************
* PROBLEM DESCRIPTION: The DVT function may waste processor    *
*                      and I/O time when encountering volumes  *
*                      that do not have a valid z/OS vtoc or   *
*                      that have an empty VTOC.                *
****************************************************************
* RECOMMENDATION: Apply the provided PTF.                      *
****************************************************************
File Manager was not always performing a validity check on the
extents of a VTOC, and then attempting to scan such VTOCs for
entries matching the requested pattern. Empty DSCBS for non
indexed volumes were also being unnecessarily stored
internally.

    



Problem conclusion


    

  • File Manager DVT processing has been updated in order to always
check the validity of vtoc extents in order to avoid unnecessary
processing and to avoid storing empty DSCBs for non indexed
volumes.

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    PM43496
    • 

  • Reported component name
    FILE MANAGER ZO
    • 

  • Reported component ID
    5655V5200
    • 

  • Reported release
    A10
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2011-07-11
    • 

  • Closed date
    2011-09-20
    • 

  • Last modified date
    2011-11-02
    • 





    

  • APAR is sysrouted FROM one or more of the following:
    

    
PM36891
    

    • 

  • APAR is sysrouted TO one or more of the following:
    

    • 



Modules/Macros


    

  • FMN0LVL

    



Fix information


    

  • Fixed component name
    FILE MANAGER ZO
    • 

  • Fixed component ID
    5655V5200
    • 



Applicable component levels


    

  • RA10  PSY  UK72042
       UP11/10/13  P  F110
    • 



Fix is available


    

  • Select the PTF appropriate for your component level.
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              [{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG19M","label":"APARs - z\/OS environment"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"A10","Edition":"","Line of Business":{"code":"","label":""}},{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSXJAV","label":"File Manager for z\/OS"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"A10","Edition":"","Line of Business":{"code":"LOB35","label":"Mainframe SW"}}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            02 November 2011
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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