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IJ16988: PDISK WWN DETERMINATION MAKE MORE ROBUST

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APAR status

  • Closed as program error.

Error description

  • Intermittent hardware errors could occasionally prevent a
pdisk from being properly identified, resulting in not
all
I/O paths found or pdisks being declared "missing".  In
all
cases, the mmlspdisk command would show the pdisk with a
WWN beginning with "md5."

Local fix

  • Stop and restart Spectrum Scale on the I/O node.

Problem summary

  • Intermittent hardware errors could occasionally prevent a pdisk
from being properly identified, resulting in not all I/O paths
found or pdisks being declared "missing".  In all cases,
the mmlspdisk command would show the pdisk with a WWN beginning
with "md5."

Problem conclusion

  • Fix makes Spectrum Scale more robust against such errors.

Work around:
Stop and restart GPFS on the I/O node.

Problem trigger:
Transient hardware errors affecting SCSI Inquiry commands.

Symptom:
Unexpected Results/Behavior

Platforms affected:
ppc64-linux
x86_64-linux
ppc64le-linux
AIX/Power

Functional Area affected:
ESS/GNR

Customer Impact:
High Importance

Changed Externals:
None

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IJ16988
    • 

  • Reported component name
    SPECTRUM SCALE
    • 

  • Reported component ID
    5725Q01AP
    • 

  • Reported release
    423
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2019-06-18
    • 

  • Closed date
    2019-06-18
    • 

  • Last modified date
    2019-06-28
    • 





    

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

    
IJ16984
    

    • 

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

    • 



Fix information


    

  • Fixed component name
    SPECTRUM SCALE
    • 

  • Fixed component ID
    5725Q01AP
    • 



Applicable component levels


    

  • R423  PSY  U885025
       19/06/28  I  1000
    • 








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            28 June 2019
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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