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IJ35941: TCP CONNECTION IS RESET WHEN IO WORKLOAD IS RUNNING

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APAR status

  • Closed as program error.

Error description

  • When IO workload is running, such as NSD read on the TCP
connection may be incorrectly reset since we pass an
invalid parameter to syscall. And reconnect logic is
triggered, if all the connections to the peer node are
reset, this will trigger node expel.

Below message is showed in mmfs.log:
Close connection to 192.168.116.63 ps7n13 <c0n2>:[0]
(Connection reset by peer). Attempting reconnect.

Reported in:
5.1.2.x

Known Impact:
Frequent node expels

Local fix

  • 



Problem summary


    

  • When IO workload is running, such as NSD read on general GPFS,
ECE or ESS, the TCP connection may be incorrectly reset since
we pass an invalid parameter to syscall.
And reconnect logic is triggered, if all the connections to the
peer node are reset, this will trigger node expel.

    



Problem conclusion


    

  • Fix the potential TCP connection reset and node expel issue

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IJ35941
    • 

  • Reported component name
    SPEC SCALE STD
    • 

  • Reported component ID
    5737F33AP
    • 

  • Reported release
    511
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2021-11-02
    • 

  • Closed date
    2022-01-12
    • 

  • Last modified date
    2022-01-12
    • 





    

  • 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":"511","Line of Business":{"code":"LOB26","label":"Storage"}}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            13 January 2022
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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