Abstract: A data storage apparatus arranged to provide redundancy in a storage enclosure containing multiple Serial ATA disk drives is disclosed. The apparatus comprises at least one disk drive of a kind having a single port for the input and output of serial data and at least two disk drive controllers each having data transmit and receive paths connected in common to the single port. The apparatus then switches control to either controller if the other should fail.

Abstract: A fiber channel analyzer for analyzing the operation of a fiber channel arbitrated loop (FC-AL) to which a plurality of devices are connectable is disclosed. The analyzer is adapted to be housed in an enclosure which, in use, houses at least one of the fiber channel devices. The analyzer extracts data from the fiber channel, processes the extracted data; and communicates processed data to a SES Processor through a secondary communication bus.

Abstract: A data gathering device for a rack enclosure which is, in use, cooperable with at least one SES processor, each processor being incorporated in a respective plug-in card. The data gathering device comprises at least one port adapted to communicate with a respective environmental services processor, a plurality of data inputs and a plurality of controllable outputs. The data gathering device is adapted to generate and send, to an SES processor responsible for the enclosure, a message reporting the state of the data inputs and to receive, from the responsible SES processor, a message including a command determining the state of one of the controllable outputs.

Abstract: A data storage apparatus arranged to provide redundancy in a storage enclosure containing multiple Serial ATA disk drives is disclosed. The apparatus comprises at least one disk drive of a kind having a single port for the input and output of serial data and at least two disk drive controllers each having data transmit and receive paths connected in common to the single port. The apparatus then switches control to either controller if the other should fail.

Abstract: A data gathering device for a rack enclosure which is, in use, cooperable with at least one SES processor, each processor being incorporated in a respective plug-in card. The data gathering device comprises at least one port adapted to communicate with a respective environmental services processor, a plurality of data inputs and a plurality of controllable outputs. The data gathering device is adapted to generate and send, to an SES processor responsible for the enclosure, a message reporting the state of the data inputs and to receive, from the responsible SES processor, a message including a command determining the state of one of the controllable outputs.

Abstract: A fiber channel analyzer for analyzing the operation of a fiber channel arbitrated loop (FC-AL) to which a plurality of devices are connectable is disclosed. The analyzer is adapted to be housed in an enclosure which, in use, houses at least one of the fiber channel devices. The analyzer extracts data from the fiber channel, processes the extracted data; and communicates processed data to a SES Processor through a secondary communication bus.