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newton (N). The unit of force required to impart an acceleration of one meter per second per second to a mass of
2
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.
path group. A collection of equivalent paths. Storage devices may have one - n path groups.
PCI. See Peripheral Component Interconnect.
peer node. When clustering, the second node at the site; not used for configuration.
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.
primary node. The node used to configure the remaining nodes in a cluster. There is a local primary node and a
remote primary node.
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.
323
Glossary
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