How to configure an H2 datasource?

For the life of me I can't get pentaho BI to connect to my h2 datasource.

Current configuration:

Database Type: H2 Native (JDBC)
Host Name: localhost
Database Name: /home/myusername/h2/pemc_for_pentaho
Port Number: 3306
Username: sa
Password: sa

I'm sure my mistake is with the Database Name. If it helps, in tomcat's catalina.out I'm getting this:

org.h2.jdbc.JdbcSQLException: Error opening database: "Could not load properties /home/clim/pentaho/biserver-ce/tomcat/bin/h2:/localhost:3306/ho
me/clim/h2/pemc_for_pentaho.lock.db" [8000-131]

Please help before I lose all my hair over this.

Thanks,
Mark