system menu icon. The term for the symbol found in the top left-hand corner of some windows that is used to control the presence and appearance of those windows. See system menu.

T

TCP. Transmission control protocol. A form of LAN communications protocol.

TCP. Telecommunications Carrier Products. A form of LAN communications protocol.

tape drive. A device that is used for moving magnetic tape and includes the mechanisms for writing and reading data to and from tape. See also tape unit and transport.

tape library. A term used to refer to the customer's collection of tapes. Within the IBM 3494 Tape Library, this simply means the set of cartridges contained within the enclosure.

tape library dataserver. An automated tape library consisting of mechanical components, cartridge storage frames, IBM tape subsystems, and controlling hardware and software. The tape library dataserver performs tape cartridge mounts and demounts without operator intervention.

tape management software. A program that controls the scratch status of tape volumes.

tape unit. A device that contains tape drives and their associated power supplies and electronics.

tape volume cache. The Tape Volume Cache is a major component of a Virtual Tape Server and is a combination of RAID DASD, RAM buffering and internal licensed code that stores and manages virtual volumes.

teach. The process that allows the library manager, using the cartridge accessor, to learn the exact physical locations of each major unit within the tape library.

telecommunications carrier products (TCP). A form of LAN communications protocol.

title bar. The area at the top of each window that contains the window title and system-menu icon. When appropriate, it also contains the minimize, maximize, and restore icons.

token-ring network. A local area network (LAN) that uses ring topology, where tokens are passed from node to node. A node that is ready to send can capture a token and insert data for transmission.

transient cartridges. Cartridges that reside in a customer's library that are not stored within the con®nes of the automated tape library and are not recorded as part of the automated library's inventory.

transient mount. See mount from input station.

transmission control protocol (TCP). A form of LAN communications protocol.

transport. The mechanism inside a tape drive that moves tape media. It is comprised of loading, threading and guiding mechanisms and motors.

U

unavailable. A term used to indicate that a component in the tape library (for example, the cartridge accessor) is unavailable for use by the library manager. Compare with Offline. Contrast with available.

unit. (1) An entity capable of accomplishing a speci®c purpose; for example, a 3490E tape drive. (2) An individual piece of the tape library that can be added or deleted from a tape library con®guration, for example, 3490E control unit, 3490E tape unit, storage frame, or Convenience Input¤Output Station.

unit emergency power off (UEPO). The 3494 switch that, when operated in an emergency, cause the 3494 to be disconnected from the ac power source.

unit power off (UPO). A switch that removes all power from a speci®c units of the tape library.

unload. To remove cartridges from a 3490E drive.

V

VTAM. Virtual Telecommunications Access Method. A form of LAN communication protocol.

VTS. A Virtual Tape Server is comprised of a Virtual Tape Server controller, 3590 tape devices and the 3494 Tape Library. Together they manage the utilization of the cartridge storage capacity and performance capabilities of the 3590 tape technology transparently to host software and applications.

virtual tape drive. A virtual tape drive is a representation of the functionality of a 3490E class tape drive as viewed by the host control program. The data from/to the drive is directed to the Tape Volume Cache and all drive related commands are emulated through the internal licensed code in the Virtual Tape Server controller.

virtual tape server (VTS). A Virtual Tape Server is comprised of a Virtual Tape Server controller, 3590 tape devices and the 3494 Tape Library. Together they manage the utilization of the cartridge storage capacity and performance capabilities of the 3590 tape technology transparently to host software and applications.

virtual volume. A virtual volume is a customer accessible volume that exists in the Tape Volume Cache

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Image 367
IBM Magstar 3494 manual Transient mount. See mount from input station