IBM Support

IJ45068: AFM READ GETS GENERATED ON A TRUNCATED FILE WITH WRITE QUEUED ON IT.

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APAR status

  • Closed as program error.

Error description

  • A file that is open in Truncate mode, and a write
generated on it is later getting a Read on it to
cache the file from home in AFM IW mode.
This causes Read to see Write as dependent
and ends up deadlocking.

Local fix

  • Nonce

Problem summary

  • A file that is open in Truncate mode, and a write
generated on it is later getting a Read on it to
cache the file from home in AFM IW mode.
This causes Read to see Write as dependent
and ends up deadlocking.

Problem conclusion

  • This problem is fixed in 5.1.2.10
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:
Such deadlock situations where Read is generated
on a file for which Write is already there cannot
happen.

Work around:
None

Problem trigger:
Open AFM cached file in Truncate mode and Write to it.

Symptom:
Deadlock

Platforms affected:
All Linux OS platforms

Functional Area affected:
AFM

Customer Impact:
High Importance

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IJ45068
    • 

  • 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
    2023-02-02
    • 

  • Closed date
    2023-02-02
    • 

  • Last modified date
    2023-02-02
    • 





    

  • 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:
            

            02 February 2023
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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