I am running OES2 SP2.
I would like to secure the server but clustering seem complicated to install.
Is the following idea a good alternative?

I plan to program a diskless server with 2 external mirrored subsystems and make available to the customer a second identical server. That way if any of the subsystems fail, the other takes over and if the server fails, the staff can unplug the subsystem from the failed server and plug it to the spare server.

Any comment on this idea? Is there a list of manufacturers that are OES2 SP2 compliant?

Thanks in advance for your input.