Document revision date: 19 July 1999 | |
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target disk: In VMSINSTAL.COM or VMSKITBLD.COM, the
disk to which you move the system files. Compare with source
disk.
terminal queue: A type of output execution queue that
uses a symbiont to direct output to a terminal
printer. Compare with printer queue and server
queue.
terminal servers: Communication devices dedicated for
connecting terminals, modems, or printers to a local area network (LAN)
and to other systems within a LAN. See also LAT
protocol.
time differential factor (TDF): Difference between
local system time and Coordinated Universal Time (UTC). See also
Coordinated Universal Time.
track: On a disk, the collection of
sectors (or blocks, on Files-11 volumes) at a single
radius on one recording surface of the disk. It is accessible to a
given read/write head position on the disk device.
trailer labels: On magnetic tape, labels similar to
header labels, but which are written following the
file.
transaction group: A group of computers involved in
DECdtm transactions whose SCSNODE names must obey specific rules.
transaction log: A file that stores information about
DECdtm transactions performed on a node. It is of file type .LM$JOURNAL.
trusted logical names: Logical names associated with
executive mode or kernel mode.
tuning: The process of altering various system values
to obtain the optimum overall performance possible from any
given configuration and work load.
UAF: See user authorization file
(UAF).
UETP (User Environment Test Package): A software
package designed to test whether the OpenVMS operating system is
installed correctly.
UIC: See user identification code
(UIC).
UIC-based protection: A protection mechanism based on
the user identification code (UIC) and applied to all
protected objects. Compare with access control list
(ACL).
update procedure: Procedure used if you have a
previous version of the operating system and you want to make minor
fixes to it. When you update the operating system, the update procedure
replaces some system files.
upgrade procedure: If you are already running a
standard version of the operating system, you can use the upgrade
procedure to obtain a higher version.
user authorization file (UAF): A file containing an
entry for every user that you authorize to gain access to the system.
Each entry identifies the user name, password, default account, UIC
(user identification code), quotas, limits, and privileges assigned to
individuals who use the system.
User Environment Test Package (UETP): See
UETP.
user identification code (UIC): The pair of numbers
assigned to users, files, and other system objects, that specify the
type of access available to the owner, group, world, and system. The
UIC consists of a group number and a member number separated by a comma
and enclosed within square brackets. Same as UIC. See also
account and UIC-based protection.
user mode: The least privileged processor
access mode. User processes and run-time library
routines run in user mode.
UTC: See Coordinated Universal Time.
utility program: A program supplied by Compaq that
performs a set of related operations. For example, the Backup utility
(BACKUP) allows you to save and restore files.
VAXcluster satellite: In a Local Area VAXcluster
configuration, a VAXcluster computer without a local system disk. A
VAXcluster satellite uses disks and tapes locally connected to a
VAXcluster server.
VAXcluster server: In a Local Area VAXcluster
configuration, a VAXcluster node that uses the mass storage
control protocol (MSCP) server and tape mass storage
control protocol (TMSCP) server software to make its locally
connected disks and tapes available to VAXcluster
satellites over the local area network (LAN).
VAXcluster system: A loosely coupled configuration of
two or more VAX computers and storage subsystems. A VAXcluster system
appears as a single system to the user, even though it shares some or
all of the system resources. When a group of VAX computers shares
resources in a VAXcluster environment, the storage and computing
resources of all the computers are combined, which can increase the
processing power. See also OpenVMS Cluster system.
VAXport drivers: In a VAXcluster environment,
device drivers that control the communication paths
between local and remote ports. (Examples are PADRIVER for the CI,
PEDRIVER for the LAN, and PIDRIVER for the DSSI.)
vector: On VAX systems, a group of related
scalar values, or elements, all of the same data type.
vector-capable systems: On VAX systems, those systems
that comply with the VAX vector architecture.
vector consumer: On VAX systems, a process requiring
the vector capability and having a vector context.
vector-present processor: On VAX systems, an
integrated scalar-vector processor pair, included in a VAX vector
processing system configuration.
virtual device server: Serves physical device media
and sets of logical disk blocks to client systems in a local area
network (LAN). Systems running the appropriate client software can
connect to virtual devices as though they are locally attached devices.
A virtual device server does not impose a file system on the virtual
devices that it serves. See also InfoServer system.
virtual device unit: With an InfoServer system, a virtual device that represents the local OpenVMS context for a volume that resides on a remote server.
Virtual disk units have a device name in the DADn: format. Virtual tape units have a device name in the MADn: format.
See also binding, InfoServer system,
and virtual device server.
volatile database: On a node in a network, a working
copy of the DECnet configuration database that
reflects current network conditions. Contrast with permanent
database.
volume: Disk or tape media that has been prepared for
use by creating a new file structure on it and mounting it on a device.
volume set: A collection of disk volumes bound into a single entity by the DCL command MOUNT/BIND. To users, a volume set looks like a single, large volume.
Also, the volumes on which a set of multivolume files is recorded.
volume space: Set of all logical sectors on a volume
containing information about the volume.
writable image: A known image for
which a shared non-copy-on-reference writable section is removed from
physical memory (for paging reasons or because no processes are
referencing it), and it is written back to the image file.
write lock: A device becomes write-locked when a hardware or user error occurs while a disk or magnetic tape volume is mounted for a write operation. For example, if a disk is write-locked or a tape is missing a write ring, the hardware generates an error.
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