System Startup, Configuration, and Shutdown Reference Manual (32650-90892)

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system data structures.
unit number A part of an address used for devices. A number whose meaning is
software-dependent and device-dependent, but which is often used to specify a particular
disk drive in a device with a multidrive controller.
UPDATE 1) The MPE/iX ISL utility that performs a system load from tape. It replaces the
current base system files on disk, and optionally replaces configuration files. The ISL
UPDATE
CONFIG option is equivalent to the MPE V/E COLDSTART procedure, and the UPDATE
NOCONFIG option is equivalent to the MPE V/E UPDATE operation. 2) An MPE V/E coldload
option that loads all files in the PUB group of the SYS account from the backup media. I/O
configuration data, the directory, and user files are loaded from the system disk. UPDATE is
typically used to install a new version of system software or to load MPE from another
computer. Equivalent to the MPE/iX ISL UPDATE utility UPDATE NOCONFIG option.
use communications subsystems capability (CS capability) A capability assigned to
accounts and users allowing access to the MPE communications subsystems.
user command A set of MPE/iX commands that a user has grouped together to perform a
specific task. A user command is stored in a command file and does not have to be entered
into a catalog. User commands are last in MPE’s search path for commands.
user level security The file access modes permitted the user. User level security must
duplicate, or be a subset of, the file access permitted the user's account and group.
user logging A facility that enables users and subsystems to record additions and
modifications to files. If necessary, user logging also provides the means whereby recorded
entries can be used to recover the files themselves.
use volumes capability (UV capability) A capability assigned at the account and user
level allowing users to access private disk volumes.
utility program An operating system program that performs specific functions such as
file copying, sorting, merging, memory dump analysis, or monitoring available disk space.
variable A value that can be changed, as opposed to a constant, usually represented by a
letter or a group of alphanumeric characters.
volume A single disk pack. Each volume is a member of a volume set and contains a
volume label, a label table, and a free space map.
volume class A class 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 name The name given to a volume set or volume class with the NEWSET command.
The name can be assigned only by a user with CV (create volume) capability, usually the
system manager or account manager. The volume name is an ASCII character string of up
to eight alphanumeric characters, beginning with an alphabetic character.