IBM 201 manual TSM see Tivoli Storage Manager, USB see universal serial bus

timeout. A time interval that is allotted for certain operations to occur, for example, a response to polling or addressing before system operation is interrupted and must be restarted.

Tivoli Storage Manager (TSM). A client/server product that provides storage management and data access services in a heterogeneous environment.

Transmission Control Protocol (TCP). In TCP/IP, a host-to-host protocol that provides transmission in an internet environment. TCP assumes Internet Protocol (IP) is the underlying protocol.

Transmission Control Protocol/Internet Protocol (TCP/IP). The Transmission Control Protocol and the Internet Protocol, which together provide reliable end-to-end connections between applications over interconnected networks of different types.

True Image data view. A data view that allows the file to be restored in the event of accidental deletion. It consists of ‘point-in-time’ images that provide a near-instant virtual copy of an entire storage volume.

TSM (see Tivoli Storage Manager).

twinaxial cable. A three-conductor cable with the two inner conductors serving to carry the signal energy, and the outer conductor serving as ground. The three conductors are insulated from each other.

U

universal serial bus (USB). A serial interface standard for telephony and multimedia connections to personal computers.

unshielded twisted pair (UTP). A cable medium with one or more pairs of twisted insulated copper conductors bound in a single plastic sheath.

USB (see universal serial bus).

V

VLAN (see virtual local area network).

VLU. Volume logical unit.

VLUN (see virtual logical unit).

virtual connection. A connection set up between two points that appears to the user to be available as a dedicated connection. This phantom connection can be maintained indefinitely or can be ended at will. The three states of a virtual connection are up, down or suspended.

virtual local area network (VLAN). A logical association of switch ports based upon a set of rules or criteria such as MAC addresses, protocols, network address, or multicast address. This permits resegmentation of the LAN without requiring physical rearrangement.

virtual logical unit (VLUN). A subset of a logical drive.

virtual port. Logical construct that corresponds to a logical adapter for a switched network port. A virtual port organizes outgoing switched logical links by specifying incoming call acceptance criteria, by dynamically building and relating logical adapters with selected hardware adapter ports, and by specifying adapter-related data link control (DLC) profiles for use with those logical adapters.

VNI. Virtual network interface.

volume. (1) Unit of storage on disk, tape, or other data recording media. (2) A logical disk visible to the appliance over a storage network. A member of a single storage network of 1 to n fabrics. It can have 1 to n path groups of 1 to n equivalent paths.

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