IBM Support

IJ52992: EXCESSIVE CES IP FAILOVERS IN PRESENCE OF HIGH NFS LOAD

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APAR status

  • Closed as program error.

Error description

  • This APAR addresses a problem in the NFS health check :When NFS
is under load, the rpc null check may fail. The failure will be
tolerated if the statistics check shows that NFS-Ganesha is
still completing NFS rpc requests. 5.1.9.6 statistics check is
not working, so the rpc null check fail will not be ignored and
a CES IP failover triggered even though NFS-Ganesha is still
completing NFS rpc requests.

Local fix

  • 



Problem summary


    

  • This APAR addresses a problem in the NFS health check :When NFS
is under load, the rpc null check may fail. The failure will be
tolerated if the statistics check shows that NFS-Ganesha is
still completing NFS rpc requests. 5.1.9.6 statistics check is
not working, so the rpc null check fail will not be ignored and
a CES IP failover triggered even though NFS-Ganesha is still
completing NFS rpc requests.

    



Problem conclusion


    

  • This problem is fixed in 5.1.9.7
To see all Spectrum Scale APARs and their respective
Fix solutions refer to page: 
https://public.dhe.ibm.com/storage/spectrumscale/spectrum_scale
_apars.htmlBenefits of the solution:The code has been modified t
restore the statistics check.

Work Around:
None

Problem trigger:
When NFS is under load, the rpc null check may fail. The failure
will be tolerated if the statistics check shows that NFS-Ganesha
is still completing NFS rpc requests. 5.1.9.6 statistics check
is not working, so the rpc null check fail will not be ignored
and a CES IP failover triggered even though NFS-Ganesha is still
completing NFS rpc requests.

Symptom:
CES IP failover. NFS Service marked as failed mmsysmonitor log
constantly shows statistics check fail.

Platforms affected:
Linux Only. Only 5.1.9.6 ptf is affected.

Functional Area affected:
NFS-Ganesha, CES-IP failover.

Customer Impact:
High Importance

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IJ52992
    • 

  • 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
    2024-11-04
    • 

  • Closed date
    2024-11-04
    • 

  • Last modified date
    2024-11-04
    • 





    

  • 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:
            

            04 November 2024
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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