User`s guide

380 Implementing an Open IBM SAN
higher value functions including -- reporting of
capacity, performance, etc. over time (trends),
configuration of multiple devices based on
policies, monitoring of capacity and performance,
automated responses to events or conditions,
and storage related data mining.
StorWatch Specialist A StorWatch interface for
managing an individual fibre Channel device or a
limited number of like devices (that can be
viewed as a single group). StorWatch specialists
typically provide simple, point-in-time
management functions such as configuration,
reporting on asset and status information, simple
device and event monitoring, and perhaps some
service utilities.
Striping A method for achieving higher
bandwidth using multiple N_Ports in parallel to
transmit a single information unit across multiple
levels.
STP Shielded Twisted Pair
Storage Media The physical device itself, onto
which data is recorded. Magnetic tape, optical
disks, floppy disks are all storage media.
Switch A component with multiple entry/exit
points (ports) that provides dynamic connection
between any two of these points.
Switch Topology An interconnection structure in
which any entry point can be dynamically
connected to any exit point. In a switch topology,
theavailablebandwidthisscalable.
T11 A technical committee of the National
Committee for Information Technology Standards,
titled T11 I/O Interfaces. It is tasked with
developing standards for moving data in and out
of computers.
Tape Backup Making magnetic tape copies of
hard disk and optical disc files for disaster
recovery.
Tape Pooling A SAN solution in which tape
resources are pooled and shared across multiple
hosts rather than being dedicated to a specific
host.
TCP Transmission Control Protocol - a reliable,
full duplex, connection-oriented end-to-end
transport protocol running on top of IP.
TCP/IP Transmission Control Protocol/ Internet
Protocol - a set of communications protocols that
support peer-to-peer connectivity functions for
both local and wide area networks.
Time Server A Fibre Channel-defined service
function that allows for the management of all
timers used within a Fibre Channel system.
Topology An interconnection scheme that allows
multiple Fibre Channel ports to communicate. For
example, point-to-point, Arbitrated Loop, and
switched fabric are all Fibre Channel topologies.
T_Port
An ISL port more commonly known
as an E_Port
, referred to as a Trunk port and
used by INRANGE.
TL_Port A private to public bridging of
switches or directors, referred to as
Translative Loop.
Twinax A transmission media (cable) consisting
of two insulated central conducting leads of
coaxial cable.
Twisted Pair A transmission media (cable)
consisting of two insulated copper wires twisted
around each other to reduce the induction (thus
interference) from one wire to another. The
twists, or lays, are varied in length to reduce the
potential for signal interference between pairs.
Several sets of twisted pair wires may be
enclosed in a single cable. This is the most
common type of transmission media.
ULP Upper Level Protocols
UTC Under-The-Covers, a term used to
characterize a subsystem in which a small
number of hard drives are mounted inside a
higher function unit. The power and cooling are
obtained from the system unit. Connection is by
parallel copper ribbon cable or pluggable
backplane, using IDE or SCSI protocols.
UTP Unshielded Twisted Pair
Virtual Circuit A unidirectional path between two
communicating N_Ports that permits fractional
bandwidth.