On old SVN Server side:
# svnadmin dump your_repository_dir > repo.dmp
* This will take more than minutes.
On new SVN Server side:
# svnadmin create repo # svnadmin load repo < repo.dmp
Note that taking a dump of repository does NOT dump the configuration files in repository.
So make you copy the conf directory.
References:
http://www.digitalmediaminute.com/article/2251/how-to-move-a-subversion-repository
http://2tbsp.com/node/88
http://svnbook.red-bean.com/en/1.1/ch05s03.html#svn-ch-5-sect-3.5