Hallo,
hier ein IBM Dokument:
Disable the Creation of Files Within /tmp/.com_ibm_tools_attach
Technote (troubleshooting)

Problem(Abstract)

Some Java applications can create thousands of files within the /tmp/.com_ibm_tools_attach directory.
Cause

These directories are created for each JVM job to support attach handlers.
Resolving the problem

You should do the following:

1. Edit or create the following file:

/QIBM/UserData/Java400/SystemDefault.properties:

2. Add the following entries:

#AllowOptions
com.ibm.tools.attach.enable=no
com.ibm.tools.attach.logging=no

Example

....+....1....+....2....+....3....+....4....+..
************Beginning of data**************
#AllowOptions
com.ibm.tools.attach.enable=no
com.ibm.tools.attach.logging=no

3. Ensure there are no additional spaces behind the value 'no'.

Note: All JVMs must be restarted for this to take effect. This will affect only new JVMs.