How to add a hotspare drive to a 3ware array/controller
You can add a hotspare drive to a 3ware controller using the tw_cli utility. Example:
tw_cli /c0 add type=spare disk=14
Where c0 is the controller, and 14 is the port. You can show which ports are being used in which arrays by running:
tw_cli /c0 show
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