PowerVault ML6000 Maintenance Guide 469
Glossary
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.
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.
CAN (controller area network)
A serial bus network of microcontrollers that connects devices, sensors, and actuators in a system or sub-
system for real-time control applications. There is no addressing scheme used in controller area networks,
as in the sense of conventional addressing in networks (such as Ethernet). Rather, messages are broadcast
to all the nodes in the network using an identifier unique to the network.
cartridge
A container that is a protective housing for storage media, such as cartridges for tapes or optical disks.
channel zoning
A method of subdividing a storage area network into disjoint zones on a per-channel basis to enhance
security and qualify access.
cleaning tape/cleaning cartridge
A tape used to clean recording heads and reading heads on a tape drive.
cleaning slot
The physical home where a cleaning tape or cartridge resides.
CLI (command line interface)
A method of interfacing with a file system in which the user types commands, using a specific command
syntax, from a command line.
COD (Capacity on Demand)
A library feature that allows users to have a large physical library, but only be licensed to use a subset of its
total capacity. Users pay only for what they are currently using. License upgrades enable more capacity
without causing a system interruption.
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