Yes, it's possible. There's a few configurations you could go with. You could have a load balancer in front of two webservers with two copies of MySQL running in a master-master configuration. Or the webserver <-> database server configuration. If you ever went with three you could do the same configuration with the webservers, only a backend database server. I'm not too sure what kind of configuration would work the best with vBulletin however.
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