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power-off. To remove electrical power from a device.
power-on, powered-on. (1) To apply electrical power
to a device. (2) The state of a device when power has
been applied to it.
private device. A device that is attached directly to a
server and is not connected to a fabric or switch. A
private device can be part of an arbitrated loop topology
or point-to-point topology.
protocol. The meanings of, and the sequencing rules
for, requests and responses that are used to manage a
network, transfer data, and synchronize the states of
network components.
public device. A device that is attached to a fabric or
switch, and can communicate to that fabric or switch. A
public device can be part of an arbitrated loop topology
or point-to-point topology.
Q
quiesce. To put a device into a temporarily inactive or
inhibited state, but not remove it from the server.
R
read. To acquire or interpret data from a storage
device, from a data medium, or from another source.
reboot. To reinitialize the execution of a program by
repeating the initial program load (IPL) operation.
record. The smallest distinct set of data bytes that is
supplied from a server for processing and recording by
a tape drive, and the smallest distinct set of data to be
read from tape, reprocessed, and made available to a
server by a tape drive.
record boundaries. The fixed limits of a record.
relative humidity. The ratio of the amount of water
vapor actually present in the air to the greatest amount
possible at the same temperature.
repeater. A device that regenerates signals to extend
the range of transmission between data stations or to
interconnect two branches. A repeater is a node of a
local area network.
reset. To return a device or circuit to a clear state.
LDI wrap plug. A connector mechanism that connects
to an LDI port for the purpose of testing the Ultrium 2
Tape Drive’s circuitry for the LDI interface.
LDI wrap test. A diagnostic that can be run on the
Ultrium 2 Tape Drive to determine whether the circuitry
functions properly to and from the LDI connector.
S
s. See second.
SAN. See Storage Area Network.
SAN Data Gateway. A device that provides Fibre
Channel attachment between Open Systems servers
and SCSI disk and tape storage systems.
SC. See subscription channel connector.
scratch cartridge. A data cartridge that contains no
useful data, but can be written to with new data.
SCSI. See Small Computer Systems Interface.
SCSI bus. (1) A collection of wires through which data
is transmitted from one part of a computer to another.
(2) A generic term that refers to the complete set of
signals that define the activity of the Small Computer
Systems Interface (SCSI).
SCSI connector. Located at the rear of the Ultrium 2
Tape Drive, the connector that facilitates commands to
and from the server, and to which the internal SCSI
cable of an enclosure connects.
SCSI device. Anything that can connect into the SCSI
bus and actively participate in bus activity.
SCSI drive sense data. In response to inquiry from
the server about an error condition, a packet of SCSI
sense bytes that contains information about the error
and that is sent back to the server by the drive.
SCSI ID. The unique address (from 1 to 15) that you
assign to an Ultrium 2 Tape Drive that uses a SCSI
interface (Model T400).
SCSI ID connector. Located at the rear of the Ultrium
2 Tape Drive, the connector that enables the drive’s
SCSI address to be set. Addresses are determined by
the placement of jumpers on the pins.
SCSI interface. See Small Computer Systems
Interface.
SCSI protocol. A set of rules that control the
communication and transfer of data between two or
more SCSI devices or systems in a communications
network.
SCSI ID switch. Located on an enclosure that
contains a Ultrium 2 Tape Drive, a mechanism that
connects to the drive and allows you to change the
drive’s SCSI ID without using jumpers.
SCSI log sense data. In response to inquiry from the
server about the Ultrium 2 Tape Drive’s error logs and
counters, a packet of SCSI sense bytes which contains
that information and which is sent back to the server by
112 IBM TotalStorage LTO Ultrium 2 Tape Drive