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S
SAN. See storage area network.
SCSI. See small computer system interface.
SDLC. See synchronous data link control.
server. (1) In a network, a node that provides facilities
to other stations; for example, a file server, a printer
server, a mail server.
service adapter or IP address. The adapter and IP
address used for client access; a "virtual" IP that will
failover to another adapter or node.
shielded twisted pair (STP). A cable medium
consisting of a telephone wire wrapped in a metal
sheath to eliminate external interference.
Simple Network Management Protocol (SNMP). In
the Internet suite of protocols, a network management
protocol that is used to monitor routers and attached
networks. SNMP is an application-layer protocol.
Information on devices managed is defined and stored
in the application's Management Information Base
(MIB).
single-mode optical fiber. An optical fiber in which
only the lowest-order bound mode (which can consist of
a pair of orthogonally polarized fields) can propagate at
the wavelength of interest. Contrast with multimode
optical fiber.
small computer system interface (SCSI). A standard
hardware interface that enables a variety of peripheral
devices to communicate with one another.
SNMP. See Simple Network Management Protocol.
storage area network (SAN). A dedicated storage
network tailored to a specific environment, combining
servers, storage products, networking products,
software, and services.
socket. In TCP/IP, the Internet address of the host
computer on which the application runs, and the port
number it uses. A TCP/IP application is identified by its
socket.
storage client network. A classic, interconnected,
fibre channel fabric with a single, fibre channel-fabric
name.
storage controller. A device (such as a RAID
controller) that creates and manages other storage
devices. The circular arrangement between storage
controllers and storage devices is due to the in-band
management techniques used by the storage
controllers.
storage device. A logical unit number (LUN) that
terminates a collection of ports on the storage network.
storage network. An arrangement that provides
shared access to a set of logical unit numbers (LUNs)
across one - n storage client networks.
storage port. An engine's connection point to a
storage client network. A storage port is a member of a
single fabric. See also engine.
storage unit. Hardware that contains one or more
drive bays, power supplies, and a network interface.
Some storage units contain RAID controllers; their
storage unit is accessed by the NAS Gateway 500.
STP. See shielded twisted pair.
synchronize. Command that propagates the local
node's definition of the cluster to all other nodes of the
cluster.
synchronous data link control (SDLC). A discipline
for managing synchronous, code-transparent,
serial-by-bit information transfer over a link connection.
Transmission exchanges may be duplex or half-duplex
over switched or nonswitched links. The configuration of
the link connection may be point-to-point, multipoint, or
loop.
synchronous data transfer. A physical transfer of
data to or from a device that has a predictable time
relationship with the execution of an I/O request.
T
tape device. A collection of tape units that share a
model type and serial number (such as all the logical
unit numbers (LUNs) of a tape library). See also tape
unit.
tape unit. A tape device or a robotics controller that is
visible over a storage network. A tape unit is a member
of a single storage network (of 1 - n fabrics), but can
have 1 - n equivalent paths.
target. A collection of logical units that are directly
addressable on the network. The target corresponds to
the server in a client-server model.
TB. see Terabyte.
TCP. See Transmission Control Protocol.
TCP/IP. See Transmission Control Protocol/Internet
Protocol.
teaming. The grouping of two to four ports or adapters
to increase transmission and reception throughput.
Teaming creates a single, high-speed, fault-tolerant link
that provides load balancing for both outbound and
inbound traffic.
Telnet. In the Internet suite of protocols, a protocol
that provides remote-terminal connection service. It
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Glossary
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