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glossary 57

glossary

host The host computer system acting as controller for the drive.

load The process in which the drive takes in an inserted cartridge and goes online.

LUN Logical Unit Number, by which different devices at a particular SCSI ID can

be addressed individually. The drive has a fixed LUN of 0.

LVD Low-Voltage Differential. See

SCSI

offline The drive is offline if the tape is currently unloaded or not in the drive. The

host has limited access, and cannot perform any commands that would cause

tape motion. The host can, however, load a tape, if one is inserted, and can

execute any diagnostic tests that do not require tape motion.

online The drive is online when a tape is loaded. The host has access to all command

operations, including those that access the tape, set configurations and run

diagnostic tests.

RAW see

read-after-write

read-after-write RAW improves data integrity by reading data immediately after it is written

and writing the data again if an error is found.

SCSI Small Computer System Interface—a standard command specification and

command set that enables computers and peripherals to communicate with

each other. HP’s Ultrium drives adhere to the SCSI specifications (see

Chapter 1, “Interface Implementation” in Volume 3, The SCSI Interface, of the

HP Ultrium Technical Manual) and support all features required by those

standard.

Single-Ended and Low Voltage Differential SCSI

These terms define how the signals are transmitted along the cable.

With single-ended (SE) SCSI, each signal travels over a single wire and each

signal’s value is determined by comparing the signal to a paired ground wire.

Signal quality tends to decrease over longer cable lengths or at increased

signal speed.

With low voltage differential (LVD) signaling, signals travel along two wires

and the difference in voltage between the wire pairs determines the signal

value. This enables faster data rates and longer cabling with less susceptibility

to noise than SE signaling and reduced power consumption.

Narrow and Wide, Fast, Ultra and Ultra2 SCSI

HP C1533A User Manual

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