Here is the syntax for the SVN server's URL:
svn+ssh://user@your_IP_address/srv/your_disk/svn/repository_name/
For instance, if your hostname is 'harry', your repository is 'gandi', and your username is 'bob', the URL will be:
svn+ssh://bob@92.243.X.X/srv/d_harry/svn/gandi/
It is sometimes necessary for Subversion to open several SSH connections for the same action. SSH keys and/or SSH connection multiplexing (see ssh_config/ControlMaster can avoid this.