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IV58338: POSSIBLE DISK I/O ERROR WHEN USING ASYNCHRONOUS STORAGE DEVICES APPLIES TO AIX 6100-07

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APAR status

  • Closed as program error.

Error description

  • This APAR addresses a possible disk I/O error.  This error
may happen only when all of the following are true:
- The disk is an "Asynchronous" access device that has
optimized and non-optimized paths.
- The disk is attached using 16GB FC or 10GB FCoE adapters
- The disk is using the AIX default PCM
- The disk is using the round_robin or shortest_queue path
selection algorithm
- Errors occur in the SAN that simultaneously affect all
of the optimized paths to the disk.

If I/O fails under these conditions, there will be
an error report entry with label SC_DISK_ERR3 and
the first line of the "SENSE DATA" will end with
0200 0400 0000 0000.

Local fix

  • 



Problem summary


    

  • This APAR addresses a possible disk I/O error.  This error
may happen only when all of the following are true:
- The disk is an "Asynchronous" access device that has
optimized and non-optimized paths.
- The disk is attached using 16GB FC or 10GB FCoE adapters
- The disk is using the AIX default PCM
- The disk is using the round_robin or shortest_queue path
selection algorithm
- Errors occur in the SAN that simultaneously affect all
of the optimized paths to the disk.

If I/O fails under these conditions, there will be
an error report entry with label SC_DISK_ERR3 and
the first line of the "SENSE DATA" will end with
0200 0400 0000 0000.

    



Problem conclusion


    

  • Modified the SCSI disk driver to be less aggressive failing
I/O that has been switched between different paths too many
times.  Modified the AIX default PCM to improve the handling
of specific errors from the drivers for the new FC adapters.

    



Temporary fix


    

  • 



Comments


    

  • 6100-07 - use AIX APAR IV58338
6100-08 - use AIX APAR IV57954
6100-09 - use AIX APAR IV55724
6100-09 - use AIX APAR IV55724
6100-09 - use AIX APAR IV55724
7100-01 - use AIX APAR IV57675
7100-02 - use AIX APAR IV57039
7100-03 - use AIX APAR IV55668
7100-04 - use AIX APAR IV55731

    



APAR Information




    

  • APAR number
    IV58338
    • 

  • Reported component name
    AIX 610 STD EDI
    • 

  • Reported component ID
    5765G6200
    • 

  • Reported release
    610
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2014-03-31
    • 

  • Closed date
    2014-03-31
    • 

  • Last modified date
    2016-05-10
    • 





    

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

    
IV55668
    

    • 

  • 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  U866978
       UP14/08/11  I  1000
    • 








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            10 May 2016
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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