IBM Support

IJ53910: UNEXPECTED LONG WAITER ON PREFETCHLISTMUTEX

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APAR status

  • Closed as program error.

Error description

  • Unexpected long waiters on PrefetchListMutex could cause user
applications to hang.   This could cause cluster wide
performance degradation.

Local fix

  • Set prefetchPartition configuration to default

Problem summary

  • Unexpected long waiters on PrefetchListMutex could cause user
applications to hang.   This could cause cluster wide
performance degradation.

Problem conclusion

  • This problem is fixed in 5.1.9.9
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:
Prevent unexpected long waiters on PrefetchListMutex

Work Around:
Set prefetchPartition configuration to default

Problem trigger:
Setting prefetchPartition configuration to value other than
default

Symptom:
Hang/Deadlock/Unresponsiveness/Long Waiters

Platforms affected:
ALL Operating System environments

Functional Area affected:
All Scale Users

Customer Impact:
Critical

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IJ53910
    • 

  • Reported component name
    SPEC SCALE STD
    • 

  • Reported component ID
    5737F33AP
    • 

  • Reported release
    519
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2025-03-13
    • 

  • Closed date
    2025-04-01
    • 

  • Last modified date
    2025-04-01
    • 





    

  • 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":"BU048","label":"IBM Software"},"Product":{"code":"STXKQY"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"519","Line of Business":{"code":"LOB69","label":"Storage TPS"}}]
              

                                                                    

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            01 April 2025
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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