Seagate ST39175LW Podręcznik Użytkownika Pobierz pdf (Strona 15)

Chapter 1, Introduction 5

Terminology

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.

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.

Snapshot mirror

An exact copy of a primary volume at a particular moment, reproduced on a physically

separate device. Snapshot mirrors are created by the VERITAS Volume Manager (VxVM).

Third-Party Copy Device (SAN network device and offhost backup method)

This term has two meanings:

◆ A backup processor on the SAN that operates on behalf of backup applications. The

third-party copy device receives backup data from a disk attached to Fibre Channel and

sends it to a storage device, using the SCSI Extended Copy command. The third-party

copy device is sometimes called a copy manager, third-party copy engine, or data

mover. In SAN hardware configurations, a third-party copy device can be

implemented as part of a bridge, router, or other device.

◆ An offhost backup method in NetBackup ServerFree Agent that allows backups to be

made by means of a backup processor on the SAN.

ufs file system

This is the UNIX File System (ufs), which is the default file system type on Sun Solaris.

The ufs file system was formerly the Berkeley Fast File System.

VfMS (VERITAS Federated Mapping Services)

A library of routines (methods) used by NetBackup ServerFree Agent to obtain the

physical addresses of logical disk objects such as file and volume names.

VxFS

This is the VERITAS extent-based File System (VxFS), designed for high performance and

large volumes of data.

VxVM

This is the VERITAS Volume Manager (VxVM), which provides logical volume

management that can be used in SAN environments.

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

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Seagate ST39175LW Podręcznik Użytkownika Strona 15