In a two-node Windows Server 2008 failover cluster, is it required that the machines be identical? We're looking to utilize existing hardware to reduce downtime using one very fast server and one only moderately fast server, both Dell PowerEdges but of different generations.
I've found the following suggestions that you should use matching hardware, but will we be able to achieve our goals of increased availability using different servers? And if so, what types of issues should we look out for with this type of configuration?
From MS TechNet: Appendix A: Failover Cluster Requirements
We recommend that you use a set of matching computers that contain the same or similar components.
You should use identical hardware in all clustered servers. Using identical hardware components makes the configuration easier to manage and can eliminate potential compatibility issues.