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resource group. A set of resources handled as one unit.
router. An attaching device that connects two LAN segments at the reference-model network layer. The LAN
segments may use similar or different architectures.
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.
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NAS Gateway 500 Administrator's Guide
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