Compaq External RAID Controller & Subsystem Infortrend Operation Manual page 245

When the new controller is connected, the existing controller will
automatically start initializing the replacement controller (IFT-3102U2G and
above). If the existing controller does not initialize the replacement
controller, execute the "Deassert Reset on Failed Controller" function.
If the replacement has been initialized normally, you may proceed to
examine the system status. From the main menu, select "View and Edit
Peripheral Devices" and then "View Peripheral Device Status" to see that the
new controller is being scanned.
When the scanning has completed, the status will change to "Enabled."
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