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IV69116: AIX CAN CRASH IBM POWER8 E880 (9119-MHE) WITH > THAN 128 CORES APPLIES TO AIX 7100-03

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APAR status

  • Closed as program error.

Error description

  • AIX can crash when running on High End P8 model E880 (9119-MHE)
Only LPARs running AIX 7.1 TL3 SP3 and later, in native P8
mode, are exposed.
Any such LPAR running on a system with more than 128 total
cores is exposed, which is possible only with the the above P8
models configured with 3 or more drawers of the 48 core node,
or 4 drawers of the 32 core node.
.
This problem is resolved in SP5.  For SP3 and SP4, ifixes are
available here:
ftp://aix.software.ibm.com/aix/ifixes/IV69116/
https://aix.software.ibm.com/aix/ifixes/IV69116/
The ifix is concurrent update capable, but will require
temporarily disabling CPU folding.  You can disable folding and
install as a hotpatch with:
> schedo -o vpm_fold_policy=0
> emgr -i <ifix.epkg.Z> -C
> schedo -o vpm_fold_policy=(previous setting)
.
Customers installing AIX 7.1 TL3 on the above model P8 with
more than 128 total cores need to set the system to run in P7
compat mode before attempting installation or the boot for the
install will fail.  After installation, apply the SP5 or the
ifix above, and then the system can be set to run in P8 mode.

Local fix

  • 



Problem summary


    

  • AIX kernel incorrectly thinks maximum possible processors is
1024 in some places.  This limit can be surpassed with 3 & 4
node configurations of E880  systems.

    



Problem conclusion


    

  • Correct AIX logic to allow for the maximum possible processors.

    



Temporary fix


    

  • 



Comments


    

  • 6100-08 - use AIX APAR IV70108
6100-09 - use AIX APAR IV69078
7100-02 - use AIX APAR IV70228
7100-03 - use AIX APAR IV69116

    



APAR Information




    

  • APAR number
    IV69116
    • 

  • Reported component name
    AIX V7.1
    • 

  • Reported component ID
    5765H4000
    • 

  • Reported release
    710
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2015-02-02
    • 

  • Closed date
    2015-02-02
    • 

  • Last modified date
    2015-09-30
    • 





    

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

    
IV69078
    

    • 

  • 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  U865837
       UP15/05/19  I  1000
    • 



PTF to Fileset Mapping








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            30 September 2015
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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