This cmdlet should only be used if the data source is in an unrecoverable state. If you can still connect to the data source, ...

This cmdlet should only be used if the data source is in an unrecoverable state. If you can still connect to the data source, you should use the Remove-SCDWManagementGroup cmdlet or the data warehouse unregistration wizard on the Administration overview pane of the Service Manager console. Would you like to proceed with running the Remove-SCDWDataSource cmdlet?