Patent ID: 6154791
Filing Date: 2000-11-28
Classification: G06F

Abstract:
A communication or DASD system for an array of direct access storage devices or DASD, the array including a plurality of DASD slots, each DASD slot for receiving a DASD and each DASD receiving power from an associated regulator, the system comprising:a plurality of loop resiliency circuits forming at least a first communication path, each loop resiliency circuit associated with one of the DASD slots and selectively including the associated DASD slot in the first communication path based on a selection signal;a plurality of local selection circuits, each selection circuit associated with one of the DASD slots and one of the plurality of loop resiliency circuits, each selection circuit connected to the associated DASD slot to receive output of a regulator if the associated DASD is in the associated DASD slot, and each selection circuit generating, without receipt of an external control signal, the selection signal based on one of the output from the regulator and a lack thereof, the output of the regulator indicating whether power is being supplied to the associated DASD.