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IJ38283: SPECTRUM SCALE ERASURE CODE EDITION BACK-END STORAGE MANAGEMENT DEGRADATION CAN CAUSE NODE EXPULSION.

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APAR status

  • Closed as program error.

Error description

  • Spectrum Scale Erasure code edition interacts with
third party software/hardware APIs for
internal disk enclosure management.
If the management interface becomes degraded
and starts to hang commands in the kernel,
the hang may also block communication
handling threads.
This causes a node to fail to renew its lease,
causing it to be fenced off
from the rest of the cluster.
This may lead to additional outages.

Local fix

  •   The node with hardware problems will show waiters
'Until NSPDServer discovery completes.'
It is recommended to reboot those nodes with those
GPFS waiters exceeding 2 minutes.

Problem summary

  • Spectrum Scale Erasure code edition interacts with
third party software/hardware APIs for
internal disk enclosure management.
If the management interface becomes degraded
and starts to hang commands in the kernel,
the hang may also block communication
handling threads.
This causes a node to fail to renew its lease,
causing it to be fenced off
from the rest of the cluster.
This may lead to additional outages.

Problem conclusion

  • This problem is fixed in 5.1.3  PTF 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:
Degradation of back-end storage management
no longer causes node expels.

Work Around:
The node with hardware problems will show waiters
'Until NSPDServer discovery completes.'
It is recommended to reboot those nodes with those
GPFS waiters exceeding 2 minutes.

Problem trigger:
Degradation in back-end storage management
that causes commands to hang in the kernel.

Symptom: Hang/Deadlock/Unresponsiveness/Long Waiters

Platforms affected:  Linux Only

Functional Area affected: ESS/GNR

Customer Impact: High Importance

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IJ38283
    • 

  • Reported component name
    SPEC SCALE STD
    • 

  • Reported component ID
    5737F33AP
    • 

  • Reported release
    513
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2022-03-08
    • 

  • Closed date
    2022-03-08
    • 

  • Last modified date
    2022-03-08
    • 





    

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

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            08 March 2022
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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