Dell PowerVault LTO-3-060 Посібник користувача - Сторінка 7
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status light. Located at the front of the tape drive, an LED that can be green or amber, and (when lit) solid or flashing. The condition of the light represents the state of
the drive.
T
TapeAlert. A patented technology and ANSI standard that defines conditions and problems that are experienced by tape drives.
TapeAlert flags. Status and error messages that are generated by the TapeAlert utility and display on the server's console.
tape cartridge. A removable storage case that houses belt-driven magnetic tape that is wound on a supply reel and a takeup reel.
tape drive. A data-storage device that controls the movement of the magnetic tape in a tape cartridge. The DELL PowerVault LTO3-060 tape drive houses the
mechanism (drive head) that reads and writes data to the tape. Its native data capacity is 400 GB per cartridge; with 2:1 compression, its capacity is up to 800 GB.
tape path. Within a tape drive, the channel in which the media moves.
terminate. To prevent unwanted electrical signal reflections by applying a device (known as a terminator) that absorbs the energy from the transmission line.
terminator. (1) A part that is used to end a SCSI bus.
(2) A single-port, 75-ohm device that is used to absorb energy from a transmission line. Terminators prevent energy from reflecting back into a cable plant by
absorbing the radio frequency signals. A terminator is usually shielded, which prevents unwanted signals from entering or valid signals from leaving the cable system.
Test Head diagnostic. A test that determines whether the heads of the tape drive are operating properly and whether the drive can correctly read from and write to
tape.
transfer rate. See data transfer rate.
U
Ultra160 LVD SCSI interface. See Small Computer Systems Interface.
unload. The act (performed by the drive) of unthreading tape from the drive's internal tape path and returning it (with the leader block) to the tape cartridge.
utility. See utility program.
utility program. A computer program that supports computer processes. For example, a diagnostic program, a trace program, or a sort program.
V
VDC. Volts DC (direct current).
volt. The SI (international) unit of potential difference and electromotive force. Formally defined as the difference of electric potential between two points of a
conductor that carries a constant current of one ampere when the power dissipated between these points is equal to one watt.
W
wet bulb temperature. The temperature at which pure water must be evaporated adiabatically at constant pressure into a given sample of air in order to saturate the
air under steady-state conditions. Wet bulb temperature is read from a wet bulb thermometer.
write. To make a permanent or transient recording of data in a storage device or on a data medium.
write protected. Applicable to a tape cartridge, the condition that exists when some logical or physical mechanism prevents a device from writing on the tape in that
cartridge.
write-protect switch. Located on the tape cartridge, a switch that prevents accidental erasure of data. Pictures of a locked and unlocked padlock appear on the
switch. When you slide the switch to the locked padlock, data cannot be written to the tape. When you slide the switch to the unlocked padlock, data can be written to
the tape.
Write/Read test. Part of the Test Head diagnostic, a procedure that determines whether the tape drive can correctly read from and write to tape.
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