Requirements to replace the controller - ASA A20, ASA A30, and ASA A50
Before replacing the controller in your ASA A20, ASA A30, or ASA A50 storage system, ensure you meet the necessary requirements for a successful replacement. This includes verifying all other components in the system are functioning properly, verifying that you have the correct replacement controller, and saving the controller's console output to a text log file.
You must review the requirements and considerations for the controller replacement procedure.
Requirements
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All shelves must be working properly. 
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The healthy controller must be able to take over the controller that is being replaced (referred to in this procedure as the “impaired controller”). 
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You must replace a controller with a controller of the same model type. You cannot upgrade your system by just replacing the controller. 
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You cannot change any drives or shelves as part of this procedure. 
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You must always capture the controller's console output to a text log file. The console output provides you with a record of the procedure you can use to troubleshoot issues you might encounter during the replacement process. 
Considerations
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It is important that you apply the commands in this procedure to the correct controller: - 
The impaired controller is the controller that is being replaced. 
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The replacement controller is the new controller that is replacing the impaired controller. 
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The healthy controller is the surviving controller. 
 
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After you’ve reviewed the requirements to replace the impaired controller, you need to shut down the impaired controller.
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