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IT27298: ON PURESCALE SYSTEMS WITH A LARGE NUMBER OF MEMBERS OR FILESYSTEMS, DB2CLUSTER -CFS -ENTER -MAINTENANCE -ALL MAY HANG

Fixes are available

Db2 Version 11.1 Mod 4 Fix Pack 5 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod 4 Fix Pack 6 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod 4 Fix Pack 6 for Linux, UNIX, and Windows

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APAR status

  • Closed as program error.

Error description

  • On Purescale systems with a large number of file systems or
cluster
nodes, the output of underlying Spectrum Scale command
mmshutdown
can output more than default system pipe buffer capacity. This
causes
the mmshutdown command to block and causing the db2cluster
command
to hang.

When encountering this error, you may see a procstack and
proctree on the db2cluster command similar to the following:

procstack:
waitpid(??, ??, ??) + 0x200
GPFSCommandAdaptor::executeCommand(const char*,const char*,const
unsigned int)(0x8, 0x11006a1b0, 0xffffffffffc3040, 0x0) + 0xc4c
GPFSCommandAdaptor::executeCommandV2(const char*,const
char*,const unsigned int)(??, ??, ??, ??) + 0x5c
GPFSCluster::stop(int,char(*)[255])(??, ??, ??) + 0x258
db2haCFSEnterMaintenanceMode(0x18a8800018a88, 0x110031da0) +
0x54c
sqlhaCFSCallFunctionDirect(0x1a0000001a, 0x110171050) + 0x438
sqlhaCFSCallFunction(??, ??, ??) + 0xc00
sqlhaCFSEnterMaintenanceMode(??, ??) + 0x3c
sqlhaUIEnterMaintenanceModeForCFSAll(sqlhaUICB*)(??) + 0xcac
main(??, ??) + 0x4820
__start() + 0x70

proctree:
3932170     /usr/sbin/srcmstr
      7077918     /usr/sbin/sshd
            22937706     sshd:  db2inst  [priv]
                  2496318     sshd:  db2inst@pts/2
                      24772836     -ksh
                            22741122    -ksh
                                  24117288     ./db2cluster -cfs
-enter -maintenance -all
                                        21692660
/usr/lpp/mmfs/bin/mmksh  /usr/lpp/mmfs/bin/mmshutdown -a
                                              25296900
/usr/lpp/mmfs/bin/mmksh   /usr/lpp/mmfs/bin/mmcommon onall
/var/mmfs/tmp/nodefile
                                                    20185254
/usr/bin/perl  /usr/lpp/mmfs/bin/mmdsh  -vF
/var/mmfs/tmp/cmdTmpDir.mmcommon.2529

22544406     <defunct>

The output of mmshutdown command will also exceed 32k.

Local fix

  • Redirect STDOUT and STDERR of mmshutdown command.

Problem summary

  • ****************************************************************
* USERS AFFECTED:                                              *
* ALL                                                          *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to Db2 11.1 Mod 4 Fixpack 5 or higher                *
****************************************************************

Problem conclusion

  • First fixed in Db2 11.1 Mod 4 Fixpack 5

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IT27298
    • 

  • Reported component name
    DB2 FOR LUW
    • 

  • Reported component ID
    DB2FORLUW
    • 

  • Reported release
    B10
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2018-12-12
    • 

  • Closed date
    2020-01-16
    • 

  • Last modified date
    2020-01-16
    • 





    

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

    • 

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

    • 



Fix information


    

  • Fixed component name
    DB2 FOR LUW
    • 

  • Fixed component ID
    DB2FORLUW
    • 



Applicable component levels


    

  • RB10  PSN
       UP
    • 








      
              
                            

              

              [{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSEPGG","label":"DB2 for Linux- UNIX and Windows"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.1","Line of Business":{"code":"LOB10","label":"Data and AI"}}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            04 May 2022
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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