Impediment RS-1600-X24, User Manual, Page: 240 / 256

RS-1600-X24 User Guide
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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-X24 FC-AL disk drive mounted in a carrier . You can have up to
sixteen disk drive carrier modules in each RS-1600-X24 enclosure.
Enclosure The chassis assembly which houses the plug-in modules that make up the RS-1600-X24
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 RS-1600 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.