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How they help me, for proprietary protocols with closed source code? Right no help. HA inside OS used everywhere, but with software without build in HA can be fault tolerance only with VM HA.

Thanks for reply, but our application works fine in HA, HA DB and so on. Some specific apps like billing, ERP, NMS don't have this functionality and wouldn't have in far future. Now we solve all problem except hardware fail. I'm not just post links for technologies. It's already here, not a future.

No application. We ISP. For example we need 2 DNS servers, 2 SIP servers, 2 mail servers and so on. Each of type must run in different hosts. No need to balance any application. Just need to place VWs on less load server if fault. But some troubles in yum autoupdate CPU goes to 100% and another...

1. You miss IMHO. 2. I don't need load balancer at any solution for load balance for app. 3. As I write before. Load balancer need to qualify enough resources to migrate. Read about RHEV(oVirt) HA or VMWare HA or migrate overloaded VM to less load host.

LB need for: select less loaded host for HA migration VM. drop overloaded VM (CPU, IO) to different host. shutdown unneeded hosts and start up it again. 1. Some example about HA. Configuration like this: Site #1: Host #1, Host #2, Host #3, Host #4 Site #2: Host #5, Host #6, Host #7, Host #8...