how to do Apache SVN synchronization in multiple servers?

I have three servers installed Apache subversion on debian 9 OS. 3 servers are High availability servers using pacemaker. I am using Virtual IP for access Apache. So that means when Master down, client become Master. so I need SVN real time synchronization to all servers.

Is there any other method to do this like svnsync?

i did not found any documentation about multiple server SVN synchronization.

please help me