I am trying to change the logpath location on DB2 V8 FP4 Aix 5.2. I don't what I am not doing but it has no effect ... here are the commands:

$ db2 get db cfg for db2test
Changed path to log files (NEWLOGPATH) =
Path to log files = /db2/db2testlog/NODE0000/SQL00001/SQLOGDIR/NODE0000/
Overflow log path (OVERFLOWLOGPATH) =
Mirror log path (MIRRORLOGPATH) =

$ db2 update database cfg for db2test using NEWLOGPATH /db2/db2testlog/NODE0000/SQL00001/SQLOGDIR/
DB20000I The UPDATE DATABASE CONFIGURATION command completed successfully

$ db2 get db cfg for db2test
Changed path to log files (NEWLOGPATH) =
Path to log files = /db2/db2testlog/NODE0000/SQL00001/SQLOGDIR/NODE0000/
Overflow log path (OVERFLOWLOGPATH) =
Mirror log path (MIRRORLOGPATH) =

$ db2stop
12-09-2003 12:38:37 0 0 SQL1064N DB2STOP processing was successful.
SQL1064N DB2STOP processing was successful.
$ db2start
12-09-2003 12:38:40 0 0 SQL1063N DB2START processing was successful.
SQL1063N DB2START processing was successful.

$ db2 get db cfg for db2test
Changed path to log files (NEWLOGPATH) =
Path to log files = /db2/db2testlog/NODE0000/SQL00001/SQLOGDIR/NODE0000/
Overflow log path (OVERFLOWLOGPATH) =
Mirror log path (MIRRORLOGPATH) =

DB2 adds the NODE0000 to the end of the path, so you are actually pointing the new log path to the same location where it already is.