Dictionary of Information Technology by Engineering Dictionaries

Author:Engineering Dictionaries [Dictionaries, Engineering]
Language: eng
Format: epub
Publisher: UNKNOWN
Published: 2018-08-08T18:30:00+00:00

logical type: A data type that contains the values of true and false.

logical unit (LU): In open systems, a logical disk drive.2.An access point through which a user or application program accesses the SNA network to communicate with another user or application program. See also local logical unit.3.A unit of linear measurement. For example, in Mixed Object Document Content Architecture (MO:DCA) and AFP data streams, the following measurements are used: 1 L-unit = 1/1440 inch, 1 L-unit = 1/240 inch.4.An entity to which Small Computer System Interface (SCSI) commands are addressed, such as a volume or managed disk (MDisk).

logical unit 6.2 (LU 6.2): An SNA logical unit that supports general communication between programs in a distributed processing environment.

logical unit base: The linear measurement base. The value defines, for any object, the meaning of the logical unit (LU) values.

logical unit number (LUN): In the Small Computer System Interface (SCSI) standard, a unique identifier used to differentiate devices, each of which is a logical unit (LU).

logical unit number map (LUN Map): A table showing the mappings of the volumes to the logical unit numbers (LUNs).

logical unit of work (LUW): The work that occurs between the start of a transaction and commit or rollback and between subsequent commit and rollback actions. This work defines the set of operations that must be considered part of an integral set.2.The processing that a program performs between synchronization points.

logical unit of work identifier (LUWID): A name that uniquely identifies a thread within a network. This name consists of a fully qualified logical unit network name, a logical unit of work instance number, and a logical unit of work sequence number.

logical unit of work state (LUW state): The condition of a logical unit of work (LUW). The LUW state reflects the actions that have been done in that LUW and determines what the next set of actions may be.

Logical Unit type 2 (LU type 2, LU2): An SNA session that uses a 3270 device data stream to support communication between an application and a display.

logical view: A view of the service and infrastructure components, their dependencies, their connections to the physical transport, and the associated schemas.

logical volume (LVOL): The storage medium associated with a single logical unit (LU). An LVOL typically resides on one or more storage devices.2.A set of logical partitions, each of which is stored on one or more physical partitions from one or more of the physical volumes of a given volume group. A logical volume has a device name (of the form /dev/hdn) and contains a single file system.3.A portion of a physical volume that contains a file system.4.A collection of physical partitions organized into logical partitions, all contained in a single volume group. Logical volumes are expandable and can span several physical volumes in a volume group.

logical volume backup: A back up of a file system or logical volume as a single object.

Logical Volume Manager (LVM): A set of system commands, library routines, and other tools that allow the user to establish and control logical volume (LVOL) storage.

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