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IZ97649: ERROR RECOVERY LOOP IF TARGET LOGS OUT THEN LEAVES SAN APPLIES TO AIX 6100-07

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APAR status

  • Closed as program error.

Error description

  • If the Fibre Channel adapter is attached to a fabric and if
dynamic tracking or fast_fail is enabled and if a storage
target explicitly logs out of the host just before leaving
the SAN fabric, then an endless loop can occur in the Fibre
Channel driver's error recovery.  The host will continuously
send queries to the SAN fabric name server to request
information about the storage port that left the fabric.
The large number of queries may monopolize traffic on the
Fibre Channel link, or may overwhelm the fabric name server
causing broader outages in the SAN.

Local fix

  • 



Problem summary


    

  • If the Fibre Channel adapter is attached to a fabric and if
dynamic tracking or fast_fail is enabled and if a storage
target explicitly logs out of the host just before leaving
the SAN fabric, then an endless loop can occur in the Fibre
Channel driver's error recovery.  The host will continuously
send queries to the SAN fabric name server to request
information about the storage port that left the fabric.
The large number of queries may monopolize traffic on the
Fibre Channel link, or may overwhelm the fabric name server
causing broader outages in the SAN.

    



Problem conclusion


    

  • The loop is broken by setting a flag indicating that a new
login is needed later, instead of initiating the login right
away.

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IZ97649
    • 

  • Reported component name
    AIX 610 STD EDI
    • 

  • Reported component ID
    5765G6200
    • 

  • Reported release
    610
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2011-03-29
    • 

  • Closed date
    2011-03-29
    • 

  • Last modified date
    2013-04-16
    • 





    

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

    
IZ97398
    

    • 

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

    • 



Fix information


    

  • Fixed component name
    AIX 610 STD EDI
    • 

  • Fixed component ID
    5765G6200
    • 



Applicable component levels


    

  • R610  PSY  U838042
       UP11/10/13  I  1000
    • 



PTF to Fileset Mapping








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            16 April 2013
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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