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N
N. See newton.
NAS. See network-attached storage.
NetBIOS. A standard interface to networks, IBM
personal computers (PCs), and other compatible PCs. It
is used on LANs to provide message, print-server, and
file-server functions. Application programs that use
NetBIOS need not manage the details of LAN
data-link-control protocols.
network-attached storage (NAS). A task-optimized
storage device directly attached to a network that
operates independently of the general-purpose file
servers.
Network File System (NFS). A protocol, developed by
Sun Microsystems, Incorporated, that allows any host in
a network to mount another host's file directories. After
a file directory is mounted, it appears to reside on the
local host.
network information services (NIS). A set of UNIX
network services (for example, a distributed service for
retrieving information about the users, groups, network
addresses, and gateways in a network) that resolve
naming and addressing differences among computers in
a network.
newton (N). The unit of force required to impart an
acceleration of one meter per second per second to a
mass of one kilogram (1 m/s
NFS. See Network File System.
NIS. See network information services.
node. A server participating in the cluster.
O
optical cable. A fiber, multiple fibers, or a fiber bundle
in a structure built to meet optical, mechanical, and
environmental specifications (E).
P
parity check. (1) A redundancy check by which a
recalculated parity bit is compared to the pre-given
parity bit (T). (2) A check that tests whether the number
of ones (or zeros) in an array of binary digits is odd or
even (A).
patch cable. A length of cable with data connectors at
both ends; it is normally used to interconnect two
sections of building cable at a distribution panel or to
connect a product to the building cable.
path. In a network, a route between two nodes.
438
NAS Gateway 500 Service Guide
2
).
path group. A collection of equivalent paths. Storage
devices may have one - n path groups.
PCI. See Peripheral Component Interconnect.
Peripheral Component Interconnect (PCI). A local
bus for PCs from Intel that provides a high-speed data
path between the CPU and up to 10 peripherals (video,
disk, network, and so on). The PCI bus coexists in the
PC with the industry standard architecture (ISA) or
extended industry standard architecture (EISA) bus. ISA
and EISA boards plug into an ISA or EISA slot, while
high-speed PCI controllers plug into a PCI slot.
port. See socket.
port number. (1) In Internet communications, the
identification of an application entity to the transport
service. (2) In the Internet suite of protocols, the
identifier for a logical connector between an application
entity and the transport service.
protocol. The meaning of, and the sequencing rules
for, requests and responses used for managing a
network, transferring data, and synchronizing the states
of network components.
PSM. See Persistent Storage Manager.
R
RAID. See redundant array of independent disks.
RAM. See random access memory.
random access memory (RAM). A temporary storage
location in which the central processing unit (CPU)
stores and executes its processes. Contrast with direct
access storage device (DASD).
Redundant Array of Independent Disks (RAID). A
method of protecting data loss due to disk failure based
on the Redundant Array of Independent Disks
specification published by the University of California in
1987. See also device parity protection.
resource. Cluster entity, such as a disk, file system, or
network adapter, that is made highly available in the
cluster.
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.
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