Seagate ST39175LW Betriebsanweisung PDF herunterladen (Seite 25)

Chapter 1, Introduction 15

Frozen Image Overview

Snapshot vs. Mirror: Which to Choose?

Benefits of copy-on-write snapshot:

◆ Consumes less disk space: no need for secondary disks containing complete copies of

source data.

◆ May be easier to configure.

Note If cost of the additional disk drives needed for mirroring is prohibitive, choose a

copy-on-write snapshot frozen image method (nbu_snap or fsclone). See usage

considerations under “Notes on Offhost Backup and Frozen Images” in Chapter 4.

Benefits of mirror:

◆ Has less impact on the performance of the application or database host being backed

up (NetBackup client), because there is no need to run the copy-on-write mechanism.

◆ Allows faster backups: no need to share disk I/O and network bandwidth, because

the backup process reads data from a separate disk (mirror) operating independently

of the primary disk that holds the client’s source data.

Note If additional disk drives are available and virtual volumes have already been

configured with the VERITAS Volume Manager 3.1 or later, choose the vxvm frozen

image method. See usage considerations under “Notes on Offhost Backup and

Frozen Images” in Chapter 4.

NetBackup 4.0V ServerFree Agent System Administrator's Guide for Solaris

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Seagate ST39175LW Betriebsanweisung Seite 25