title: adding an existing repository to svn
body: <p>On our server the operating system is on a HD different from the rest of the filesystem. To upgrade it from CentOS 6 to CentOS 7 i replaced the disk containing CentOS 6 wit a new disk, on which i installed CentOS 7.
  So the entire filesystem, including my svn repository remained unchanged.<br>
  But in this naive setup, svn called from a workstation can not find the repository:</p>
  
  <pre><code>svn: E210005: Unable to connect to a repository at URL 'svn+ssh://user12@xxx.yyy.zzz/home/main_svn/QHG/branches/multi_spc'
  svn: E210005: No repository found in 'svn+ssh://user12@xxx.yyy.zzz/home/main_svn/QHG/branches/multi_spc'
  </code></pre>
  
  <p>I now need to get this existing repository back under the control of svn, but i don't know how to proceed.
  (the posts i found so far, only talk about creating a new repository)</p>
  
  <p>Is there a simple way to do this?</p>