In the table of servers on the Home page of Enterprise Server
Administration, click Edit to the left of the row for the
server for which you want to change the number of instances.
You see the Server >
Properties > General page
Specify the new System Directory location.
Note:
If you specify a directory in this field, that directory must
exist; Enterprise Server does not create it for you.
The System Directory cannot be shared between enterprise servers.
Click OK.
You must restart the server for the changes to take effect.