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IV70317: MPIO PATH RECOVERS TOO SOON WHEN A LUN IS UNMAPPED APPLIES TO AIX 7100-02

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APAR status

  • Closed as program error.

Error description

  • If there are multiple adapters in use to provide paths to an
hdisk, and the hdisk is opened while the LUN is unmapped from
one of those adapters (thus returning 05/2500 SCSI sense),
then the AIX MPIO code may recover the path too quickly after
the open.  This could lead to the PCM selecting that unusable
path, and possibly having the path fail and recover repeatedly.

Local fix

  • 



Problem summary


    

  • If there are multiple adapters in use to provide paths to an
hdisk, and the hdisk is opened while the LUN is unmapped from
one of those adapters (thus returning 05/2500 SCSI sense),
then the AIX MPIO code may recover the path too quickly after
the open.  This could lead to the PCM selecting that unusable
path, and possibly having the path fail and recover repeatedly.

    



Problem conclusion


    

  • Modified SCSI disk driver to properly report status of a path
open when the storage device returns 05/2500 sense data to
the Test Unit Ready command.

    



Temporary fix


    

  • 



Comments


    

  • 6100-08 - use AIX APAR IV70106
6100-09 - use AIX APAR IV69311
7100-02 - use AIX APAR IV70317
7100-03 - use AIX APAR IV69309

    



APAR Information




    

  • APAR number
    IV70317
    • 

  • Reported component name
    AIX V7.1
    • 

  • Reported component ID
    5765H4000
    • 

  • Reported release
    710
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2015-02-28
    • 

  • Closed date
    2015-02-28
    • 

  • Last modified date
    2015-09-30
    • 





    

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

    
IV69309
    

    • 

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

    • 



Fix information


    

  • Fixed component name
    AIX V7.1
    • 

  • Fixed component ID
    5765H4000
    • 



Applicable component levels


    

  • R710  PSY  U866513
       UP15/09/21  I  1000
    • 



PTF to Fileset Mapping








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            30 September 2015
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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