[Serusers] Multiple SERs connection to Single DB

[TCCHAN]

Hi All:
I tried to server farm the SER and have two simple questions.
  
(1)can multiple SERs connect to single copy of MySql database at the
same time.  

I tried 

modparam("auth_db", "db_url", "sql://ser:heslo@192.228.118.240/ser")
modparam("usrloc", "db_url", "sql://ser:heslo@192.228.118.240/ser")
modparam("group", "db_url", "sql://ser:heslo@192.228.118.240/ser")

on two machines with ser, the results is that the first  one is Ok but
the second one has a error message to many db connection opened

Did I misses anything?

(2) what is the recommended way of server farming SER and how to load
balance the traffic. 



Thanks very much for any help available.
Regards,

TC Chan