Write speed in mogilefs

[Eric Chang]

We launch mogilefs last week.
We use zeus's ZXTM process incomming resquest,
then pass to two perlbal and two web(php+mogilefsd tracker) and two
storage node (mogstored).
The mod_php node process incomming request and ask tracker get file
path and send reproxy
header back to perlbal.
Now they all work,but still have some questions:
1.Mogilefs database node , we only replicate data to another server,
but how to make they auto failover ? Is it possible ? How to do this