Method and apparatus for performing site failover

A computer system, comprising:

• a first host computer;
• a second host computer;
• and
• a controller, operatively coupled to the first host computer and the second host computer and external to the first and second host computers, that automatically configures the second host computer to provide at least one of replacement computational resources for the first host computer and additional computational resources that complement computational resources provided by the first host computer in response to a change in operation of the first host.

A computer system, comprising:

• a first host computer;
• a second host computer;
• and
• configuration means, coupled to the first host computer and the second host computer and external to the first and second host computers, for automatically configuring the second host computer to provide at least one of replacement computational resources for the first host computer and additional computational resources that complement computational resources provided by the first host computer in response to a change in operation of the first host computer.

A storage system for use with a first host computer and a second host computer, the storage system comprising:

• a first storage device to store data of the first host computer;
• and
• a controller that is coupled to the first storage device and external to the first and second host computers;
• wherein the controller, when operatively coupled to the first host computer and the second host computer, automatically configures the second host computer to use the data of the first host computer and provide at least one of replacement computational resources for the first host computer and additional computational resources that complement computational resource provided by the first host computer in response to a change in operation of the first host computer.