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IJ46535: PREFETCH FAILS WITH ERR 4 FOR LIST FILE BIGGER THAN 2GB

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APAR status

  • Closed as program error.

Error description

  • With prefetch run with list-file larger than 2GB, prefetch
threads are deployed - and there are 1 or more threads that need
 to start operating at list-file offset higher than 2GB. Since
the offset/length is declared to be Int32 - the offset of higher
 than 2GB is too big to hold and causes fseek errors which
returns an error 4 (E_INTR).

Local fix

  • Split single large list file into multiple smaller list files
(each smaller than 2GB in size) and run prefetch multiple times
with list file chunks created.

Problem summary

  • With prefetch run with list-file larger than 2GB, prefetch
threads are deployed - and there are 1 or more threads that need
 to start operating at list-file offset higher than 2GB. Since
the offset/length is declared to be Int32 - the offset of higher
 than 2GB is too big to hold and causes fseek errors which
returns an error 4 (E_INTR).

Problem conclusion

  • This problem is fixed in 5.1.2.11
To see all Spectrum Scale APARs and their respective
Fix solutions refer to page:
https://public.dhe.ibm.com/storage/spectrumscale/spectrum_scale_
apars.html

Benefits of the solution:
AFM Prefetch can run with large sized list files also.

Work around:
Split single large list file into multiple smaller list files
(each smaller than 2GB in size) and run prefetch multiple times
with list file chunks created.

Problem trigger:
Running prefetch with list file larger than 2GB in size.

Symptom:
Unexpected results.

Platforms affected:
All Linux OS Platforms (AFM Gateway nodes)

Functional Area affected:
AFM

Customer Impact:
High Importance

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IJ46535
    • 

  • Reported component name
    SPEC SCALE STD
    • 

  • Reported component ID
    5737F33AP
    • 

  • Reported release
    512
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2023-04-21
    • 

  • Closed date
    2023-05-03
    • 

  • Last modified date
    2023-05-03
    • 





    

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

    • 

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

    • 



Fix information


    

  • Fixed component name
    SPEC SCALE STD
    • 

  • Fixed component ID
    5737F33AP
    • 



Applicable component levels


    








      
              
                            

              

              [{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"STXKQY"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"512","Line of Business":{"code":"LOB26","label":"Storage"}}]
              

                                                                    

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            03 May 2023
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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