A |
---|
absolute pathname | | A pathname that begins with the root directory, such as
/SYS/PUB/TDP. See also pathname and relative
pathname.
|
---|
access control definition (ACD) | |
Security feature that controls access to files and
directories. Consists of a list of access permissions and
user specifications. (For example, R,W,X:@.PAYROLL
gives all users in the PAYROLL account read, write, and
execute access to the file or directory that is assigned
this ACD.) ACDs are applied to files or directories by
using the ALTSEC command. By default, all files
existing outside the traditional MPE account/group structure
and all directories are assigned ACDs when they are created.
|
---|
access mode | |
A type of access permitted to a file, such as write, read,
or execute access.
|
---|
appropriate privilege | |
Having sufficient capabilities to perform an operation on
MPE/iX. SM capability always provides appropriate privilege
to system administrators.
|
---|
archiving | |
Storing infrequently used or out-of-date files onto tape
and permanently removing them from the system disks at the same time.
|
---|
B |
---|
back reference | |
The technique of using an asterisk (*) before a formal file designator
to indicate that it has been previously defined during the current
session or job with the FILE command.
|
---|
backup | |
The process that duplicates computer data to offline media, such as a
magnetic tape. Backups protect data if a system problem should occur.
|
---|
backup devices | |
System peripherals that allow you to write information
to, and read information from, backup media.
|
---|
C |
---|
case sensitivity | |
HFS filenames can be saved in uppercase or lowercase
letters. The file named ./FILE1 does not refer to the
same file as ./file1 or ./File1.
|
---|
character | |
A letter, number , or symbol represented by one byte of data.
|
---|
character set | |
A series of characters to substitute for a single character to name a
group of files.
|
---|
command | |
A system-reserved word that directs the operating system, a subsystem,
or a utility program to perform a specific operation.
|
---|
compatibility mode(CM) | |
Compatibility mode provides object code compatibility between MPE
V/E-based systems and the 900 Series HP 3000. Compatibility mode allows
current Hewlett-Packard customers to move applications and data to the
900 Series HP 3000 without changes or recompilation.
|
---|
concurrent backup devices | |
A set of multiple, concurrently accessible backup devices to which you
are able to store information simultaneously.
|
---|
consecutive backup devices | |
A set of multiple backup devices used for a given tapeset to which you
are able to store information sequentially.
|
---|
console | |
See system console.
|
---|
current working directory | |
The directory in which you are working and from which
relative pathnames are resolved. See also directory and
relative pathname.
|
---|
D |
---|
DAT | |
Digital Audio Tape. A data storage media used by the HP 1300H
DDS-format device.
|
---|
data compression | |
The use of data compression algorithms on the host system to reduce the
amount of data transferred to the output device.
|
---|
database | |
An integrated collection of logically related data files and the
structural information about the data.
|
---|
DDS | |
Digital Data Storage. A format for storing computer data on DAT cassettes.
|
---|
device | |
See peripheral.
|
---|
device class | |
A collection of devices that have some user-defined relation. The
MPE/iX file system supports a means of maintaining collections of
devices but is cognizant of the relation only for certain MPE device
class names.
|
---|
device pool | |
A series of identical backup devices.
|
---|
device type | |
Device types are defined by a number. For example,
0 represents a moving-head disk and 16 is the class type number
assigned to line printers.
|
---|
directory | |
A special kind of file that contains entries that point to
other files. It acts like a container for files and other
directories. On MPE/iX, accounts and groups are special
types of directories.
|
---|
disk | |
A circular plate of magnetically coated material used to store
computer data. A disk may be fixed, removable, hard, or flexible.
|
---|
dot (.) | |
Convention that signifies the current working directory in
HFS syntax. See also current working directory and
HFS syntax.
|
---|
dot-dot (..) | |
Convention that signifies the parent directory in HFS
syntax. See also current working directory and HFS
syntax.
|
---|
dot-slash (./) | |
A convention that you can use to refer to a file using HFS
syntax in your current working directory. For example,
./myfile.old refers to the file myfile.old in your
current directory.
|
---|
E |
---|
error messages | |
Messages describing errors occurring during either an interactive
session or a batch job. The messages are reported to the standard list
device, which is usually a terminal (for a session) or a line printer
(for a job).
|
---|
F |
---|
file | |
An object that can be written to, read from, or both. A
file has certain attributes including access permissions and
file type. A group of related records that represents ASCII text (text
files) or binary data (such as executable code). Every file must
have a filename so that the user can access the file's contents.
|
---|
file equation | |
A method of equating a filename to a device or another file. The
MPE/iX FILE command is used to establish the relationship of the
file to the device. Generally used to direct the input to or output
from a program, job, or session to a particular device by referencing
the device class, such as TAPE or LP.
|
---|
file owner | |
The person who has complete access to a file unless the user
is restricted by a $OWNER ACD entry. The $OWNER ACD
entry can restrict the file access of the file owner. The
file owner is similar to the file creator. The command
LISTFILE filename -3 displays the fully qualified user
ID (user.account) of the file owner.
|
---|
filename | |
A name of a file that can be in MPE syntax
(FILE.GRP.ACCT) or HFS syntax (/ACCT/GRP/FILE1).
Each syntax has different restrictions on filename length
and the characters that can compose the name. See also
MPE syntax and HFS syntax.
|
---|
G |
---|
group | |
For POSIX compatibility, refers to a group of related users.
This is distinct from MPE groups, which are special types of
directories existing directly below accounts.
|
---|
group ID (GID) | |
A number that determines group access privileges. (On
MPE/iX, it is actually the string @.account).
|
---|
group ID database | |
A system database that contains the group name, group ID,
and user names for all groups.
|
---|
H |
---|
HFS syntax | |
Expanded MPE/iX syntax that is case sensitive and allows
users to address multiple levels in the hierarchical file
system. A name beginning with "./" or "/" automatically
signifies HFS syntax to MPE/iX.
Some additional rules are as follows:
Names of directories directly under root or under an
account may have up to 16 characters.
Names of directories or files not directly under the root
or a group can be up to 255 characters.
Names of directories and files can contain the following
special characters: hyphen (-), dot (.), or slash (/)
|
---|
hierarchical file system (HFS) | |
A file system that is tree structured and can contain files
at many different levels. This file organization is
obtained through the use of directories, which can contain
files and other directories.
|
---|
I |
---|
I/O error | |
A data transmission error between a computer and peripheral. Examples
of I/O errors are baud rate or parity mismatch, and incorrect syntax in
device-control instructions.
|
---|
indirect file | |
A text file containing the parameters for a STORE
or RESTORE command that you execute regularly.
|
---|
input | |
The data to be processed, or the process of transferring
data from external storage to the computer.
|
---|
input/output (I/O) | |
The process of, or equipment used in, transmitting
information to or from the computer.
|
---|
interleave | |
A method of writing data to a disk device for the purpose
of improving data access speed.
|
---|
J |
---|
job | |
A single file, submitted by a user, containing operating system
and utility commands and references to the files to be manipulated.
|
---|
M |
---|
media | |
Devices capable of storing data, such as disks or magnetic tape.
|
---|
media name | |
The name of the media set to make available for use by TurboSTORE/XL II.
The media name is the name assigned during the STORE operation.
|
---|
media sub-name | |
The name of the surface within the media set to use. The media sub-name
is the sub-name assigned during the STORE operation.
|
---|
mounting | |
The act of making a data storage device accessible. To
physically mount the device, you load the media onto the device. To
logically mount the device, you tell the operating system which device you
want to use, and it allows you access to that device.
|
---|
MPE syntax | |
Rules that determine the filename length, special
characters, and conditions for files, groups, and accounts.
Account, group, and filenames can be up to 8 characters.
Characters are always converted up uppercase. Characters
must be alphanumeric. This is the syntax current MPE/iX
users are used to using (for example, LEDGER.PUB.SYS).
|
---|
MPE/iX | |
Multi-programming executive with intetrated Posix: The operating system
for 900 Series HP 3000 computers. MPE/iX manages all system resources
and coordinates the execution of all programs running on the system.
|
---|
N |
---|
native mode (NM) | |
The native run-time environment of MPE/iX. In native
mode, source code has been compiled into the native instruction set
of the 900 Series HP 3000.
|
---|
O |
---|
online backup | |
Online backup means that the STORE fileset and structures are accessible
for any access while the backup is taking place. Any modifications made
to the STORE fileset during the backup are logged and saved along with
the data on the backup medium. On RESTORE, the data and log file are
used to recover the data to a consistent state.
|
---|
output | |
Data transferred from internal to secondary (external) storage
in a computer. Also, the process of transferring information from the
computer to a peripheral device.
|
---|
P |
---|
parallel devices | |
A set of backup devices to which you are able to
store information simultaneously.
|
---|
parameter | |
A value in a list of values that is passed to a procedure.
The parameter is used on calculations or operations in the procedure.
|
---|
parent directory | |
A directory that contains other directories.
|
---|
pathname | |
A way of identifying the path to any MPE/iX file. For
example, you can refer to FILE1.PUB.SYS using the
pathname /SYS/PUB/FILE1. Notice that pathnames are top-
down rather than bottom-up as MPE syntax.
|
---|
peripheral | |
A hardware device attached to and controlled by a computer,
such as a terminal, a tape or disk drive, or a printer.
|
---|
POSIX | |
Portable Operating System Interface. A set of standards
that address various areas of operating system technology.
The POSIX standards describe functions of an operating
system interface that applications use to become "POSIX-
compliant." The main point of POSIX is to facilitate
software portability and minimize porting costs.
|
---|
purge | |
To delete a permanent file from the system with the PURGE
command. The PURGE command is also used to delete an account
structure entry such as a user name, a group name, or an account.
|
---|
R |
---|
relative pathname | |
A pathname that is interpreted from the current working
directory. For example, ./dir1/longfilename refers to
the file longfilename in directory dir1 in the
current working directory.
|
---|
required parameter | |
A parameter that is required when entering a command or calling an
intrinsic. In reference manuals, required parameters are surrounded by
braces ({}).
|
---|
restore | |
The process of retrieving user files from SYSGEN (MPE/iX), SYSDUMP (MPE
V/E), and STORE tapes or serial disk and writing them to disk.
Restoring is executed with the RESTORE command.
|
---|
root directory | |
Also called (and designated by) a slash or /. It is a
system directory; all files, accounts, groups, and
directories connect back to the root directory. All
accounts on MPE/iX are direct descendants of the root
directory.
|
---|
S |
---|
scratch tapes | |
Used tapes containing information that is no longer needed.
|
---|
sequential | |
A manner in which information may be read from or written to
a device. Sequentially accessed files are stored in such a way that the
logical order of the file's record is identical to their physical layout
on disk or tape.
|
---|
shadow logging | |
A method of saving the "before" images of file blocks when the records
in the file block are modified during online backup. The before images
are stored on tape and are used by RESTORE to reconstruct the original
contents of the file.
|
---|
slash (/) | |
Another name for the root directory. See also root
directory.
|
---|
storage device | |
A device (such as a disk pack, a disk cartridge, a flexible disk,
magnetic tape, or cartridge tape), onto which data can be stored and
subsequently retrieved.
|
---|
subdirectory | |
A directory that is contained within another directory is
sometimes referred to as a subdirectory.
|
---|
sync point | |
The point in time the backup occurs, where all files are synchronized.
It can occur at different times, depending on the type of backup
performed. You can schedule when the sync point occurs by scheduling
when the backup job is launched.
|
---|
system | |
A group of one or more CPUs that communicate through buses without
the use of data communications software.
|
---|
system console | | 1)A workstation given a unique status by the operating system. It is
used by the operator to execute specific commands for the purpose of
managing sessions, jobs, and system resources. It is associated with
all boot or system loader error messages, system error messages, and
certain system status messages.
2)The terminal, usually logical device 20, that the system operator uses
to monitor system activity, respond to resource requests, and send
messages to user's terminals. The console (and its associated
privileges and responsibilities) may be transferred to another logical
device with the CONSOLE command.
|
---|
system file directory | |
A directory maintained by MPE that records the name,
group, and account of each permanent file on the system. The directory
contains the size of each file, its location on the disk, who may access
it, and other information.
|
---|
system manager | |
The person who manages the computer installation, responsible for
creating accounts and assigning capabilities and resource-use limits to each.
|
---|
T |
---|
tape request | |
A printed message at the console asking for a backup device
to be assigned to a user.
|
---|
transport backup | |
Transport refers to the movement of files between MPE V/E and MPE/iX
systems using backup media. MPE/iX backup and recovery provides a
compatibility option with which an MPE V/E-compatible tape may be
created or read.
|
---|
true online backup | |
A tool that allows users to perform application and system backups
without closing files or disrupting users.
|
---|
U |
---|
user | |
Anyone logged on to a session, using a local or remote terminal to
interact with the computer. Each user is identified by a user and
account name, and can access files in the logon group.
|
---|
utility program | |
An operating system program that performs specific
functions such as file copying, sorting and merging, memory dump
analysis, or monitoring available disk space.
|
---|
V |
---|
volume | |
A volume is one disk. Each volume is a member of a
volume set and contains a volume label, a label table, and a free
space map.
|
---|
volume class | |
Volume classes are used for the allocation and
restriction of disk space. A volume class is a logical subset or partition
within a volume set and can bridge any number of physical member
volumes of a volume set.
|
---|
volume set | |
A volume set is a group of from 1 to 255 related disks.
One volume of the volume set must be designated as the master volume
for the set. Each volume set is assigned a name by which it is
identified and referenced.
|
---|
W |
---|
wildcard | |
A symbol that is used to replace a character or set of
characters. In MPE, the "at sign" (@), the "pound sign"(#), and
the question mark (?) are used as wildcard characters.
|
---|
write ring | |
A plastic ring that fits onto the inner groove of a reel-to-reel
tape, enabling you to write information onto the tape.
|
---|
write-enable | |
To remove a disk's write-protection, allowing the disk
to be written upon.
|
---|
write-protect | |
To protect stored data so that it cannot be overwritten.
|
---|