[Linux-HA] HA of virtual machiens

[Michael Schwartzkopff]

Hi,

we want to offer services on 4 servers. These services should be high 
available. All services will have very low usage.

1) The first plan was to use 8 servers and create 4 HA-clusters. But 8 servers 
doing very little is waste of money. So the next plan was:

2) Use 5 servers, build one big cluster and distribute the services in such a 
way, that not two services run on the same machine. One spare is left with 
this architecture.

3) Next plan: Use only two physical servers, create 8 virtual servers, build 
one cluster on the physical machines and have heartbeat look for the virtual 
machines. But the problem with this setup is that monitoring of the virtual 
machines does not look, if the applications on these virtual machines do 
really run.

4) Next plan: Setup as before, 2 cluster between the two physical machines, 4 
clusters between the 8 virtual machines. Monitoring on the cluster of the 
physical machines looks for the health of the virtual machines and monitoring 
in the virtual clusters look for the health of the applications.

My question: What is really the best solution?
Isn't solution 4) far too complex?
What is your oppinion. Thanks for any answer.

Sincerely,
-- 
Dr. Michael Schwartzkopff
MultiNET Services GmbH
Addresse: Bretonischer Ring 7; 85630 Grasbrunn; Germany
Tel: +49 - 89 - 45 69 11 0
Fax: +49 - 89 - 45 69 11 21
mob: +49 - 174 - 343 28 75

mail: misch at multinet.de
web: www.multinet.de

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