The upgrade from a FlashArray//XR4 to a FlashArray//XL is a specific "Data-in-Place" hardware migration that utilizes the purewes (Pure Workflow Execution Service) utility to orchestrate complex steps. One of the most critical steps involves stopping the Purity software stack on the controller that is about to be removed (CT0) to ensure a clean failover and data flush to the surviving controller.
The correct command syntax is purewes controller disable --purity --verify-mode secondary --verify- array ARRAY_NAME ct0 .
* purewes controller disable : Initiates the shutdown of the controller's services.
* --purity : Specifies that the Purity software stack should be stopped (not just the hardware).
* --verify-mode secondary : This is a crucial safety check. It ensures the command only executes if CT0 is currently the Secondary controller. If CT0 were Primary, running this command without a failover first would cause an outage.
* --verify-array : Confirms the action is being taken on the correct target array.
This command sequence ensures the controller is safely quiesced before the Implementation Engineer physically removes it from the chassis.
=========