Likely, it was a cluster server...

This is where you've got two systems that use the Same HD's, etc.....the idea being that if one fails, the other almost immediately takes over for it....

Redundancy, you see this where failure is not an option (think there were running cluster server at Mission Control in Apollo 13).....

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Thanks,
Benjamin Hirsch
Technical Analyst / Lab Manager
SharkyExtreme
"Drive it like you stole it!"