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IZ96554: BAD PAGES REPORTED BY DB2

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APAR status

  • Closed as program error.

Error description

  • A previous change was made to allow small synchronous
writes
to be sent to disk using the original IO size, as opposed
to expanding
them to full block writes.  When such a write was being
processed in
writeBuffer, the code was incorrectly bypassing clearing
the phantom
bit when writing to a pre-allocated block.  On a
subsequent read, the code
would see the phantom bit and return a block full of
zeroes to the caller,
i.e. the previous write was essentially lost.

Local fix

  • 



Problem summary


    

  • A change was made to allow small synchronous writes
to be sent to disk using the original IO size, as
opposed to expanding them to full block writes.
When such a write was being processed in writeBuffer,
the code was incorrectly bypassing clearing the
phantom bit when writing to a pre-allocated block.
On a subsequent read, the code would see the phantom
bit and return a block full of zeroes to the caller,
i.e. the previous write was essentially lost.

    



Problem conclusion


    

  • The fix was not do a range write when dealing with
a preallocated block.

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IZ96554
    • 

  • Reported component name
    GPFS/AIX5L V3
    • 

  • Reported component ID
    5765G66AP
    • 

  • Reported release
    340
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2011-03-11
    • 

  • Closed date
    2011-03-11
    • 

  • Last modified date
    2015-05-14
    • 





    

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

    
IZ96553
    

    • 

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

    • 



Fix information


    

  • Fixed component name
    GPFS/AIX5L V3
    • 

  • Fixed component ID
    5765G66AP
    • 



Applicable component levels


    

  • R340  PSY  U869511
       15/05/14  I  1000
    • 



PTF to Fileset Mapping








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            19 August 2022
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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