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IJ45706: QUOTA IN_DOUBT RAISING WHEN SUSPENDING ONE OF TWO FAILURE GROUPS

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APAR status

  • Closed as program error.

Error description

  • In a replicated file system (-r 2), when one of the disks
is suspended (or better, one of the failure groups in two
is suspended), the file writes succeed allocating disk
space on the available failure group (disk) but only one
replica per logical block is allocated.
Quota will count only the allocated replica, but the
quota share does not get reclaimed or updated. This means
quota in_doubt raising in error continuously.

Local fix

  • 



Problem summary


    

  • In a replicated file system (-r 2), when disks of a failure
group are not available, e.g. one of the failure groups in two
is suspended, the file writes succeed allocating disk space on
the available failure group but only one replica per logical
block is allocated - the file is ill-replicated. In such
scenario, quota is not handling correctly the partial successful
 block allocation as GetLocalQuota and FixLocalQuota routines
are out of sync. As result, some quota shares (in-doubt) become
not reclaimable and leading to increase of in-doubt values over
time.

    



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:
Fix quota accounting in data replicated file systems.

Work Around:
Run mmcheckquota to correct outstanding in-doubt values.

Problem trigger:
Unavailability of disks in an entire failure group in a
replicated file system with two failure groups.

Symptom:
Quota in_doubt will not decrease after workload ceased.

Platforms affected:
ALL Operating System environments

Functional Area affected:
Quotas

Customer Impact:
High Importance

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IJ45706
    • 

  • Reported component name
    SPEC SCALE STD
    • 

  • Reported component ID
    5737F33AP
    • 

  • Reported release
    516
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2023-03-06
    • 

  • Closed date
    2023-04-13
    • 

  • Last modified date
    2023-04-13
    • 





    

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

                                                                    

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            14 April 2023
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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