HP NAS 8000 Clustered Solution Manuel d'utilisateur télécharger pdf (Page 230)

228 Glossary

With NFS, computers connected to a network operate as clients while

accessing remote files, and as servers while providing remote users access to

local shared files. The NFS standards are publicly available and widely used.

Package control log

Package control logPackage control log

Package control log A log file is maintained for each package in a cluster. The software and the

package monitor log messages that are specific to the package log files. (This

feature is available only on high-availability NAS devices.)

Packet

PacketPacket

Packet A block of information sent across a network. Packets contain header (which

handle addressing), error correction, checksums, and data.

Permission

PermissionPermission

Permission The ability of a particular user in a multi-user computer environment to access

a particular resource by means of a user account. Permissions are stored in

the system, in a file called a permissions log. Permissions are checked when a

user attempts to access a resource.

Permission bits

Permission bitsPermission bits

Permission bits Bits that identify the read/write/execute (rwx) privileges for a UNIX file's

owner, group, and anyone else that needs access to the file (other).

Physical drive

Physical drivePhysical drive

Physical drive A term for the hard drives installed in the NAS server. The NAS server can

contain up to 12 physical drives.

Primary Domain

Primary DomainPrimary Domain

Primary Domain

Controller (PDC)

Controller (PDC)Controller (PDC)

Controller (PDC)

A server that has been assigned to become the primary authentication server

for the Windows NT domain. It stores a copy of the Security Accounts

Manager (SAM) database and uses this database to authenticate users.

RAID (Redundant

RAID (RedundantRAID (Redundant

RAID (Redundant

Array of

Array ofArray of

Array of

Independent Disks)

Independent Disks)Independent Disks)

Independent Disks)

RAID is a method of combining several disk drives into a single logical

storage unit. RAID offers the advantage of fault tolerance by providing real-

time data recovery when a disk drive fails, increasing system uptime and

network availability. RAID also increases system performance when multiple

drives work together.

Redundancy group

Redundancy groupRedundancy group

Redundancy group Group of physical disks that contain redundant data, as defined by the RAID

level assigned to the data. A redundancy group is also divided into logical

units (LUNs), addressable by the host. See the

HP Surestore Virtual Array

VA7100 and VA7400 User And Service Guide

for more information on how

the VA7100 and VA7400 series differ in their implementation of redundancy

groups.

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HP NAS 8000 Clustered Solution Manuel d'utilisateur Page 230

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