[Users] OpenSER and Redundancy

Hi, is anyone using openser in a redundancy enviroment? i'm planning to use two sunfire with a running openser on each. both openser get the same ip adress. on a cisco switch i can switch between too servers via hsrp. so i have a running openser on the expensive sunfire with redundant disk-drives and power supply. on the other cheap sunfire runs the backup client on standby. the backup server checks (for example via sipsak) the availability of the main server every second. the user-locations are written into a mysql table. so if server1 fails, server2 can recognize it in a second and can switch over. so only some transaction, which were processed at the moment of the failure will lost. what do you think. could this work? anyone has other ideas? bye, martin