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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.
122 NAS 200 User’s Reference