Seagate ST39175LW Anleitung zur Fehlerbehebung PDF herunterladen (Seite 20)

Terminology

6 NetBackup ServerFree Agent System Administrator’s Guide

◆ A type of frozen image made on a mirror disk (see also snapshot). At an appropriate

moment, all further writes to the primary disk are held back from the mirror, thus

causing the mirror to be “split” from the primary. As a result of the split, the mirror

becomes a “frozen” image of the primary. The frozen image can then be backed up.

NetBackup Media Server (offhost backup method)

One of two offhost backup methods provided by NetBackup ServerFree Agent, in which

data movement is performed by a NetBackup media server.

Offhost backup

The off-loading of backup processing to a separate backup agent executing on another

host. NetBackup ServerFree Agent contains two offhost backup options: NetBackup

Media Server and Third-Party Copy Device.

Primary disk

In a primary-mirror array configuration, the primary is the disk on which client data is

stored, and which is directly accessed by client applications. An exact duplicate of the

primary disk is the mirror (see mirror).

Raw partition

A single section of a raw physical disk device occupying a range of disk sectors, without a

file system or other hierarchical organization scheme (thus, a “raw” stream of disk

sectors). This is different from a block device, over which the file system is mounted.

SAN (Storage Area Network)

A Fibre Channel-based network connecting servers and storage devices. The storage

devices are not attached to servers but to the network itself, and are visible to all servers

on the network.

Secondary disk

See mirror.

ShadowImage

One of three frozen image methods included in the Extended Frozen Image Services

(Array Integration) option. ShadowImage is for making frozen images of client data on

Hitachi disk arrays.

Snapshot (copy-on-write)

In NetBackup ServerFree Agent, one of two types of supported frozen images (see also

mirror). Unlike a mirror, a copy-on-write snapshot does not create a separate copy of the

primary data (frozen image source). It creates a block-by-block “account” that describes

which blocks in the frozen image source have changed and which have not, from the

instant the snapshot was activated. This account is used by the backup application to

create the backup copy.

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Seagate ST39175LW Anleitung zur Fehlerbehebung Seite 20