Scalar i500 User’s Guide
382
Glossary
1U, 2U, 3U, etc.
Racks manufactured for mounting computer hardware
often define vertical space as “units.” The components that are
mounted in the racks are defined by how many units of rack
space they require. For example, the height of a unit in a rack is
1.75". If a component is 5.25" in thickness, the component is said
to be a 3U component.
A
Arbitrated loop
A Fibre Channel configuration that attaches multiple
communicating ports in a loop. Two or more ports can
interconnect, but only two ports can communicate
simultaneously.
Arbitration
The submission of a request to gain access to an arbitrated
loop by a device, so that it can transmit data in the loop.
Availability
A RAS attribute that refers to the accessibility of a system
resource in a timely manner; for example, the measurement of a
system’s uptime.
B
Barcode
A printed array of varied rectangular bars and spaces that can
be scanned and read for object identification.
Bus
A transmission channel through which electrical signals are
carried from one device to another device.
