SVN Server change Issue

HI Dear,

   I have a question about svn server change task.

   The status now we are at is:

   - we have 2 svn servers, one for daily-work using (http://svn.com, ip:10.0.9.120), another one is for svn server back up (http://svn_bak.com ip:10.0.9.121)
   - and both these 2 servers share the same storage which hosts the svn repositories (the storage is mounted as NFS directory)

   So, my question is:
   ===============
   if we have svn server down, we want to start to work on svn_bak server.
   Most of users checked out source code with ip address( http://10.0.9.120/svnrep1 ) ,
   so if I change the ip address of svn back up server from 10.0.9.121 to 10.0.9.120. Can users work well without any change on their local working copy?

   I have checked the repository UUID of checked out working copy from each svn server are the same.

  So I think may be we can just change the ip address on the back up server to match the down svn server to make users work on going.

  But I'm not sure, would you please help to confirm this?

Thanks!

MIAO ZHU