SAS
Serial Attached SCSI. A computer bus technology and serial communication
protocol for direct attached storage devices, including disk drives and
high-performance tape drives.
SCSI
Pronounced
scuzzy
, an acronym for Small Computer System Interface, a
standard interface and command set for transferring data between mass
storage and other devices. The host computer uses SCSI commands to
operate the device. Depending on the model, the physical connection
between the host computer and the tape drives will use a parallel SCSI,
SAS, or Fibre Channel interface.
SCSI address
See SCSI ID.
SCSI devices
Computer devices with a SCSI interface. In this document,
SCSI devices
refers to devices with a parallel SCSI interface.
SCSI ID
Each device on a parallel SCSI bus is identified by its SCSI ID, which is
a number in the range 0–7 on a narrow bus and 0–15 on a wide bus.
SE
Single Ended SCSI. The original SCSI bus technology, which uses single
ended signaling — where the signal is referenced to ground. SE SCSI
busses have lower signal rates and much shorter allowed cable lengths.
SE SCSI should not be used with UltriumLTO tape drives.
slot
The location in the magazine in which a tape cartridge is stored. Also called
a cell.
tape cartridge
A container holding magnetic tape that can be processed without separating
the tape from the container. The device uses data and cleaning cartridges.
These cartridges are not interchangeable.
tape drive
An electro-mechanical device that moves magnetic tape and includes
mechanisms for writing and reading data to and from the tape.
Terabyte
A unit of storage, abbreviated as T or TB, equal to 1,024 Gigabytes.
terminator
The last device at the end of a parallel SCSI chain must be terminated by
terminator into the connector. An appropriate terminator is shipped with
parallel SCSI devices.
U
A measure of chassis height. 1U in rack measurement is 44.45 millimeters
(1.75 inches).
USB
Universal Serial Bus. A serial bus standard used to interface devices.
World Wide
Identifier
A unique identifier in a Fiber Channel or SAS storage network, also called
a World Wide Name (WWN). The first three bytes are derived from an
IEEE Organizationally Unique Identifier (OUI), which identifies the
manufacturer or vendor. The remaining five bytes are assigned by the
vendor.
WORM
An acronym for Write Once Read Many times, a class of optical recording
systems that allow recording and adding data, but not altering recorded
data.
215
