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Galaxy 65 User Guide

Characters Per Second A data transfer rate generally estimated from the bit rate and the character length. For example, at 2400 bps, 8-bit characters with Start and Stop bits (for a total of ten bits per character) will be transmitted at a rate of approximately 240 characters per second (cps).

Chassis A sheet metal enclosure incorporating a Backplane PCB and module runner system. The chassis contains a number of 'Bays', each of which can accommodate a plug in module. There are sixteen drive carrier bays at the front and five bays at the rear which house power supply/cooling and LRC I/O modules and also the Ops Panel.

Configure To set up a hardware device and its accompanying software.

controller “A” In a redundant controller environment, one controller is designated as controller “A” and the other controller is designated as the controller “B”. Controller identity is determined by enclosure hardware. The controller’s identity displays continuously at the bottom of the Disk Array Administrator screens. See Storage Manager.

Data Communications A type of communications in which computers and terminals are able to exchange data over an electronic medium.

Disk (drive, carrier, module) A FC-Galaxy 65 FC-AL disk drive mounted in a carrier. You can have up to sixteen disk drive carrier modules in each Galaxy 65 enclosure.

Enclosure The chassis assembly which houses the plug-in modules that make up the Galaxy 65 storage Subsystem.

ESI/Ops module A unit used to monitor and control all elements of the Enclosure. The ESI/Operators (Ops) panel is supplied as an integral part of the Galaxy 65 series Enclosure core product

fabric Fabric refers to a switched topology, which is one of the three FC topologies. Fabric elements, which are responsible for frame routing, interconnect various N_Ports or NL_Ports. Connections to fabric can use loop (public loop) or point to point.

failback In Active-Active mode, failback is the act of returning ownership of controller resources from a surviving controller to a previously failed (but now active) controller. The resources include disk arrays, cache data, and host ID information.

failover In Active-Active mode, failover is the act of temporarily transferring ownership of controller resources from a failed controller to a surviving controller. The resources include disk arrays, cache data, and host ID information.

FC adapter An FC adapter is a printed circuit assembly that translates data between the FC host processor’s internal bus and FC link.

FC Arbitrated Loop (FC-AL)FC-AL is one of three FC topologies in which ports use arbitration to establish a point-to-point circuit. Arbitrated loops allow multiple ports to be connected serially in a single loop. Up to 126 NL_Ports and 1 FL_Port can be configured in a unidirectional loop. Ports arbitrate for access to the loop based on their AL_PA. Ports with lower AL_PAs have higher priority than ports with higher AL_PAs. FC-AL can be public, typically connected using switched fabric, or private, typically a direct host connection or hub.

FC device A device that uses FC communications is referred to as an FC device.

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