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IJ46131: WARN USERS ABOUT RUNNING AN MMCHNODE COMMAND TO ADD/REMOVE GATEWAY NODE ROLES

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APAR status

  • Closed as program error.

Error description

  • Adding/Removing Gateway node roles to the cluster when Active
I/O is happening to an AFM fileset can cause deadlocks owing to
how the node join/leave protocol handles leading to One
applicaiton node thinking of a certain Gateway node to be the
Gateway node for the fileset Vs other nodes thinking other nodes
 to be fileset gateway nodes.

Local fix

  • Avoid running mmchnode --gateway/--nogateway when there is
Active I/O happening on AFM filesets.

Problem summary

  • Adding/Removing Gateway node roles to the cluster when Active
I/O is happening to an AFM fileset can cause deadlocks owing to
how the node join/leave protocol handles leading to One
applicaiton node thinking of a certain Gateway node to be the
Gateway node for the fileset Vs other nodes thinking other nodes
 to be fileset gateway nodes.

Problem conclusion

  • This problem is fixed in 5.1.7.1
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:
Give user a fair warning when mmchnode --gateway/nogateway
command is run to mention what happens if there are Active I/O
to the filesets.

Work around:
Avoid running mmchnode --gateway/--nogateway when there is
Active I/O happening on AFM filesets.

Problem trigger:
Running mmchnode --gateway/--nogateway when there is Active I/O
happening on AFM filesets.

Symptom:
Deadlock

Platforms affected:
ALL Operating System environments

Functional Area affected:
AFM

Customer Impact:
High Importance

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IJ46131
    • 

  • Reported component name
    SPEC SCALE STD
    • 

  • Reported component ID
    5737F33AP
    • 

  • Reported release
    517
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2023-03-23
    • 

  • Closed date
    2023-03-23
    • 

  • Last modified date
    2023-03-23
    • 





    

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

    • 

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

    
IJ46269
    

    • 



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

                                                                    

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            03 April 2023
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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