You can change the default verbosity level of the Directory Server error log through DSCC as follows:
Log in to Directory Service Control Center.
On the Directory Servers tab page, click the server whose log level you want to configure.
Select the Server Configuration tab, then the Error Logging tab.
In the General -> Additional Items to Log section, select Plug-Ins.
You can enable plug-in logging using the command line.
$ dsconf set-log-prop errors level:err-plugins
For more information about Directory Server logging, refer to Chapter 14, Directory Server Logging, in Sun Java System Directory Server Enterprise Edition 6.1 Administration Guide.