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96257 Sun Confidential: Internal Only C-97
Revision A
support facility. VTSS functionality provided by ISP
cards and support facility software that enables human
interface with a VTSS for monitoring, communication,
and testing.
synchronous. (1) Synchronized by a common timing
signal. (2) Occurring with a regular or predictable time re-
lationship. Synchronous transmissions send strings of
data characters at regular intervals without the need for
start and stop bits required for asynchronous transmis-
sions, making them faster than asynchronous transmis-
sions. Contrast with asynchronous
.
system engineer (SE). A person who works with cus-
tomers and marketing representatives to provide system
solutions to customer needs and requirements.
T
tape drive.An electromagnetic mechanical device that
provides physical data storage on magnetic tape media.
TB. See terabyte
.
terabyte (TB). A unit of data capacity equal to 1000 gi-
gabytes or 1,000,000 megabytes.
TMS. Tape Management System.
track. A channel where information is stored on magnet-
ic or optical media. On magnetic disk media, tracks are
defined in concentric rings. A combination of two or more
sectors on a single disk media track makes a cluster or
block, the minimum unit used to store information. On
magnetic tape media, tracks run parallel to the length of
the tape, or diagonally for helical scan tracks.
tray. A part of the physical location designator for each
FRU in a unit. See unit.tray.slot
.
TUV. Technischer Ueberwachungsverein (TUV). A Ger-
man regulatory association.
U
UL. Underwriters Laboratory. A U.S. non-government lab
that certifies electrical product safety.
unavailable partition. In VSM, a partition state of VTSS
disk devices that are unavailable for storage of user data
because the devices are not installed or have failed.
Contrast with media acceptance test partition, production
partition, spares partition.
unidirectional. In only one direction; referring to a data
channel that only transmits one way.
uninstall. To remove installed software or hardware from
a system and restore modifications made to files.
unit. A part of the physical location designator for each
FRU in a unit. See unit.tray.slot
.
unit.tray.slot (U.T.S). In VTSS, an abbreviated label that
designates the precise physical location of a FRU.
Unix. A multi-user, multitasking operating system written
in C programming language and used on mainframes
and workstations. There are multiple versions of Unix for
use on different platforms. See also AIX
, Linux.
upgrade. A nondisruptive addition of function or capacity
to a VTSS. Contrast with conversion
.
upload. To transmit files or data from one storage device
or computer to another. Contrast with download
.
UPS. uninterruptible power supply. A device that sup-
plies auxiliary power to a system to ensure continuity of
operation in case the primary power supply (typically
provided by a local utility company) is interrupted. Hav-
ing a UPS as a backup power source allows time to save
files and shut down systems in an orderly manner as
needed, thereby avoiding the possible data loss that can
result from a rapid and unanticipated loss of power.
URL. uniform resource locator, a.k.a. Internet address
or
Web address.The standardized addressing or naming
system used for locating web sites over the Internet.
user programming interface. In VTSS, a software in-
terface between a user application program and ExPR.
UTC. Universal Time Coordinated, a.k.a. Greenwich
Mean Time (GMT). The mean solar time of the meridian
of Greenwich, England, used as the basis for calculating
standard time throughout the world.
U.T.S. See unit.tray.slot
.
V
VAC. Volts AC.
VCF. VSM4-VTSS Iceberg Channel FICON card.
VCU. See Virtual Control Unit
.
VDE. Verband Deutscher Elektrotechniker. The German
counterpart of Underwriters Laboratory (UL).
VIP. Virtual Initialization Program. In VSM4, a proprietary
software program contained on a floppy disk that en-
ables the installation of approved system release level
(SRL) microcode.
virtual address. A memory location in a system that us-
es virtual memory; when an application program needs
the data at that location, it is paged in and accessed by
means of an address in physical memory.
virtual control unit. In VSM, a software image that logi-
cally presents itself as a physical control unit. Each virtu-
al control unit appears to be an independent physical
control unit, although all virtual control units common to a
single physical control unit share the same facilities and
physical paths. VSM4-VTSS presents up to 16 virtual
control unit images to 1 to 28 hosts.
virtualization. Software capability in a storage sub-
system that presents the storage capacity of multiple
physical devices to a host operating system as a single
‘virtual’ storage device, enabling the host to use that
storage more efficiently.
VM. Virtual machine. (1) A computer or storage system
that does not exist as a separate physical device, but is
instead simulated by another computer or system. (2) A
virtual data processing system in which multiple operat-
ing systems and programs can be run by a computer at
the same time. Each user appears to have an indepen-
dent computer with its own input and output devices.
VSM. Virtual Storage Manager. A storage system devel-
oped by Sun StorageTek that virtualizes tape volumes
and transports in a disk buffer to improve capacity-utiliza-
tion rates of tape media and tape transports, and to im-
prove data retrieval speeds. VSM hardware includes
VTSS(s) and RTDs; VSM software includes VTCS and
VTSS microcode. By providing an image of a single,
consolidated pool of tape storage to a host, VSM pro-
vides performance and data-management advantages
over physical tape products, without requiring application
changes.
VSMAT. Virtual Storage Manager Administration Tool.
VSMRL. Virtual Storage Manager Remote Library.