Svn repository mirror using svnsync

Because my company's main svn repo is in a different city, we constantly
suffer from the slow network during development. The idea of setting up
a read-only mirror has come to my mind for a long time. But I haven't had
the time to implement it. Today, I spent half a day to set it up finally.

Here is the note to record what I read and did to make it work:

1. Read this post It tells almost everything you need to know to set it up, of course, you need to have some basic svn knowledge.
2. For me the sync was not working due to failing the acquire a write-lock. The error message is: "svnsync: Can't open file '/var/svn/pim_12_mirror/db/write-lock':Permission denied". I fix it by chowning everything under the repo to be owned by svn user.
3. Because the mirror is read-only. Using 'svn switch' sub-command will greatly help you to get the best of the mirror while being able to commit the original repo.