Dell PowerVault LTO4-120 Посібник користувача - Сторінка 18
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single-character display. Located at the front of the tape drive, an LED that presents an alphabetical or numeric code which represents a diagnostic or
maintenance function, error condition, or informational message.
sleep mode. A power-management function that causes the tape drive's electronics to automatically enter a low-power mode by which to conserve energy.
Small Computer Systems Interface (SCSI). A standard used by computer manufacturers for attaching peripheral devices (such as tape drives, hard disks,
CD-ROM players, printers, and scanners) to computers (servers). Pronounced "scuzzy." Variations of the SCSI interface provide for faster data transmission
rates than standard serial and parallel ports (up to 160 megabytes per second). The variations include:
Fast/Wide SCSI: Uses a 16-bit bus, and supports data rates of up to 20 MBps.
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SCSI-1: Uses an 8-bit bus, and supports data rates of 4 MBps.
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SCSI-2: Same as SCSI-1, but uses a 50-pin connector instead of a 25-pin connector, and supports multiple devices.
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Ultra SCSI: Uses an 8- or 16-bit bus, and supports data rates of 20 or 40 MBps.
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Ultra2 SCSI: Uses an 8- or 16-bit bus and supports data rates of 40 or 80 MBps.
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Ultra3 SCSI: Uses a 16-bit bus and supports data rates of 80 or 160 MBps.
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Ultra160 SCSI: Uses a 16-bit bus and supports data rates of 160 MBps.
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software. Programs, procedures, rules, and any associated documentation pertaining to the operation of a computer system.
speed matching. A technique used by the tape drive to dynamically adjust its native (uncompressed) data rate to the slower data rate of a server. Speed
matching improves system performance and reduces backhitch.
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 LTO4-120 tape drive houses the
mechanism (drive head) that reads and writes data to the tape. Its native data capacity is 800 GB per cartridge; with 2:1 compression, its capacity is up to
1600 GB.
tape path. Within a tape drive, the channel in which the media moves.
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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