5190/5194 Modular Tape Subsystem Manual

Glossary
5190/5194 Modular Tape Subsystem Manual—426878-002
Glossary-5
F-SAC
F-SAC. See fiber-optic ServerNet addressable controller (F-SAC).
FUP. See File Utility Program (FUP).
group. The set of all objects accessible by a pair of service processors (SPs) located in the
processor multifunction (PMF) customer-replaceable unit (CRU). In a NonStop
Himalaya S-series server, a system enclosure has exactly one group.
IDRC. See Improved Data Recording Capability (IDRC).
Improved Data Recording Capability (IDRC). A method for writing compressed data.
Data compression is a standard feature of the 5190 and 5194 tape drives that enables
the drive to store twice as much data on a cartridge tape. IDRC is also known as
Enhanced Data Recording Capabilty (EDRC).
I/O controller. The combination of a logic board (LB) and a backplane interconnect card
(BIC) that controls computer I/O operations on Compaq NonStop Himalaya K-series
servers for a particular set of devices, such as disks, tapes, terminals, or
communications lines.
ips. Inches/second, a measurement of tape speed.
KB. See kilobyte (KB).
kilobyte (KB). A unit of measurement equal to 1024 bytes. See also megabyte (MB).
labeled tape. A tape with a tape label. If a tape has no standard label, it is considered
unlabeled. See also tape label
.
LB. See logic board (LB).
leader block. A plastic end piece on a cartridge tape that allows the threader arm of the
tape drive to pick up the tape and wind it through the tape path inside the drive. A
latch on the edge of the cartridge holds the leader block firmly in place to protect the
tape when the cartridge is not in use.
LED. See light-emitting diode (LED).
light-emitting diode (LED). A semiconductor device that emits light from its surface.
Indicator lights are composed of LEDs. The 5190 and 5194 tape drives, the automatic
cartridge loader (ACL), and the back-end board (BEB) use LEDs to indicate operating
status.
load. (1) To transfer the operating system image or a program from disk to a computer’s
memory so that the operating system or program can run. (2) To insert a tape into a
tape drive, which prepares it for a tape operation (read or write). If a 5190 or 5194 tape
drive does not have an automatic cartridge loader (ACL), tapes must be loaded by
hand. If a 5190 or 5194 tape drive has an ACL, loading is performed by the ACL
autoloader.