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operating system Software that controls the
execution of program and that may provide
services such as resource allocation, scheduling,
input/output control, and data management.
Although operating systems are predominately
software, partial hardware implementations are
possible. (T)
oz An abbreviation for ounce. A unit of weight
equal to 28.35 grams.
P
peripheral device Any device that communicates
with a particular host or computer. Peripheral
devices include disk subsystems, tape subsystems,
printers, scanners, CD-ROMs, optical devices, and
communication devices.
personality module A connector key, which
connects to the library through a DB9 connector.
The personality module stores the library cell
capacity information.
picker See hand assembly.
port (1) A specific communications end point
within a host. A port is identified by a port
number. (IBM) (2) A specific end-point for
communications within a host or from a host to a
peripheral device or vice versa. (3) In Fibre
Channel, it is an access point in a device where a
link attaches. Examples of this port are N_Port,
NL_Port, F_Port, and FL_Port.
put An activity in which a robotic hand releases a
cartridge into a cell or drive.
Q
quiesce (1) Allowing all activity to complete
before any new activity is allowed to start. (2) To
bring a device or an application to a state where all
processing has been suspended and there are no
tasks in progress.
MT9104
R
redundant power supply This power supply
shares the power load with the standard power
supply so that if one component were to fail, the
other supply could take over fully without
interruption to the library operation.
reserved cells The cells in the library in which
only cleaning cartridges, diagnostic cartridges, or
swapped data cartridges may reside. Only one of
these cells is a swap cell.
robot An electromechanical device that moves
cartridges among the cartridge access ports, the
storage cells, and the drives.
S
s Seconds.
safety interlock switch A switch that
disconnects power to the library when the front
door is opened.
SCSI bus The interface connecting peripheral
devices to a host operating system.
SCSI device A host adapter or control unit
attached to the SCSI bus. Synonymous with target.
SCSI ID The bit-significant representation of an
address on the SCSI bus.
Simple Network Management Protocol
(SNMP) A protocol for monitoring and
managing systems and devices in a network.
single-ended operation A SCSI bus alternative
in which the signal passes directly between SCSI
chips on either end of the cable. Contrast with
differential operation.
small computer systems interface (SCSI) A
local interface operating over a wide range of
transfer rates using a common command set for all
devices attached to the interface. It connects host
computer systems to a variety of peripheral
devices.
SNMP See Simple Network Management
Protocol.
Seventh Edition
Glossary
Glossary-7
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