Abstract: An enclosure services processor card is arranged to selectively split a fiber-channel arbitrated-loop (FC-AL) into two split loops. The card is adapted to plug into a backplane for a rack enclosure and includes a first switch operatively connected to a hub for the FC-AL. The hub comprises a plurality of port bypass circuits, each port bypass circuit being connected to a pair of tracks which in use connect to a respective one of each of the devices comprising the fiber channel arbitrated loop. The hub further comprises a pair of switches operatively controlled by the first switch, the pair of switches being disposed between respective port bypass circuits at which the loop is to be split. In a first state the pair of switches connect the devices in a single loop and in a second state the pair of switches divide the devices into two split loops.

Abstract: A rack-mounted disk drive enclosure has a plurality of frames, each capable of being individually pulled out of the enclosure from the front. Each frame is L shaped and has a vertical portion that is more or less planar as well as a horizontal portion carrying circuitry, for example in a printed circuit board. Each frame carries a plurality of disk drives, each having at least one platter spinning parallel with the vertical portion of the frame. Each drive is disposed with its connector pointing downward, toward the printed circuit board and plugged thereinto. At the rear of the frame, a connector connects to a centerplane. Concentrator logic is placed on the printed circuit board of the frame, as are LEDs or other indicators permitting an indication of which drive (if any) needs to be replaced. In this way, it is possible to remove more than one drive, and let less than all of the drives, at a time, from the enclosure, while other drives can remain in service.

Abstract: An enclosure services processor card is arranged to selectively split a fibre-channel arbitrated-loop (FC-AL) into two split loops. The card is adapted to plug into a backplane for a rack enclosure and includes a first switch operatively connected to a hub for the FC-AL. The hub comprises a plurality of port bypass circuits, each port bypass circuit being connected to a pair of tracks which in use connect to a respective one of each of the devices comprising the fibre channel arbitrated loop. The hub further comprises a pair of switches operatively controlled by the first switch, the pair of switches being disposed between respective port bypass circuits at which the loop is to be split. In a first state the pair of switches connect the devices in a single loop and in a second state the pair of switches divide the devices into two split loops.