DB2 FOR LUW / DB2FORLUW / B10 - DB2

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     

The output of mmshutdown command will also exceed 32k.

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

Redirect STDOUT and STDERR of mmshutdown command.

not known / see Local fix

Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :

12.12.2018
16.01.2020
16.01.2020