Veritas NetBackup 8.0 SnapshotClient管理指南

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"VERITAS NetBackup 8.0 Snapshot Client Administrator's Guide" VERITAS NetBackup 8.0 是一款强大的数据保护解决方案，专为在UNIX、Windows和Linux环境中运行的企业设计。Snapshot Client是该套装软件的一个组件，提供了一种高效的方法来执行基于快照的数据备份。本指南是针对Snapshot Client的管理员手册，详细介绍了如何配置、管理和优化快照备份流程。 Snapshot Client技术利用操作系统的快照功能，创建一个特定时间点的数据副本，而无需实际复制所有数据。这极大地减少了备份窗口，提高了备份效率，并且对生产系统的影响极小。在UNIX、Windows和Linux平台上，这一特性可以与各种存储解决方案集成，如VMware VMSnapshots、Microsoft VSS (Volume Shadow Copy Service) 和其他原生文件系统快照功能。在NetBackup 8.0中，Snapshot Client支持以下关键特性： 1. **计划和自动化**：允许管理员设置自动化备份策略，确保在预定时间点自动创建快照。 2. **资源管理**：提供工具来管理存储资源，包括快照保留政策和空间回收。 3. **集成**：与多种存储阵列和虚拟化平台无缝集成，确保兼容性和高效备份。 4. **性能优化**：通过智能调度和数据压缩技术，最大化I/O性能和网络带宽利用率。 5. **恢复能力**：支持快速从快照恢复单个文件、卷或整个系统，以应对数据丢失或损坏。 6. **监控和报告**：提供详尽的监控和报告功能，以便管理员了解备份状态和性能指标。 7. **安全性和合规性**：符合法规要求，提供加密选项以保护备份数据的安全。文档版本8.0还包括关于第三方软件的法律通知，这些软件可能是开源或免费软件。Veritas要求在产品中提供对这些第三方程序的适当归因。用户在使用这些第三方软件时，原有的开源或免费软件许可证权利和义务不会受到影响。Veritas提供了指向其产品附带的第三方法律通知文档的链接，以及在线的许可协议库。此外，根据所使用的许可证限制，NetBackup 8.0可能包含不能反编译或逆向工程的组件，以保护软件知识产权。用户应遵守产品随附的软件许可协议中的条款和条件。总体而言，VERITAS NetBackup 8.0 Snapshot Client提供了可靠、高效且灵活的数据保护方案，适用于多平台环境，确保企业能够及时备份并迅速恢复重要数据，同时满足日益增长的合规需求。通过深入理解本指南，管理员能够充分利用Snapshot Client的功能，构建和维护一个强大且适应性强的数据保护体系。

Table 1-1

Snapshot Client features at a glance

DescriptionSnapshot Client feature

A point-in-time, read-only, disk-based copy of a client

volume. NetBackup backs up data from the snapshot,

not directly from the client’s primary or original volume.

Required by all features of Snapshot Client.

Snapshot

Makes the backups available for recovery from disk.Instant Recovery

Shifts the burden of backup processing onto a separate

backup agent, reducing the backup effect on the client’s

computing resources. The backup agent sends the

client’s data to the storage device.

Includes alternate the client, data mover, and virtual

machine host (for VMware).

Note: NetBackup 7.1 supports off-host backup of Oracle

database in the SFRAC (Storage Foundation Real

Application Clusters) environment. For more details, refer

to the NetBackup for Oracle System Administrator’s

Guide.

Off-host backup

Combines the speed of raw-partition backups with the

ability to restore individual files.

FlashBackup

Backs up and restores Windows and Linux Hyper-V

virtual machines (guest operating systems).

See the NetBackup for Hyper-V Administrator's Guide.

NetBackup for Hyper-V

Backs up and restores Windows and Linux VMware

virtual machines (guest operating systems).

See the NetBackup for VMware Administrator's Guide.

NetBackup for VMware

Makes snapshot-based backup of data on a Network

Attached Storage (NAS) host.

NAS snapshot

Enables NetBackup to back up only the changed data

blocks of VMware virtual machines and Oracle or DB2

database files.

Block level incremental backup

(BLIB)

Introduction

Snapshot Client features at a glance

Table 1-1

Snapshot Client features at a glance (continued)

DescriptionSnapshot Client feature

The implementation of NetBackup

OpenStorage-managed snapshot replication, where the

snapshots are stored on the storage systems of

partnering companies. Replication is conducted per

defined operations in storage lifecycle policies.

See the NetBackup Replication Director Solutions Guide.

NetBackup Replication Director

Snapshot Client features

These topics describe the features of Snapshot Client.

About snapshots

A snapshot is a point-in-time, read-only, disk-based copy of a client volume. After

the snapshot is created, NetBackup backs up data from the snapshot, not directly

from the client’s primary or original volume. Users and client operations can access

the primary data without interruption while data on the snapshot volume is backed

up. The contents of the snapshot volume are cataloged as if the backup was

produced directly from the primary volume. After the backup is complete, the

snapshot-based backup image on storage media is indistinguishable from a

traditional, non-snapshot backup image.

All the features of Snapshot Client (including off-host backup, FlashBackup, and

Instant Recovery) require the creation of a snapshot.

About snapshot methods

NetBackup can create different types of snapshots. Each snapshot type that you

configure in NetBackup is called a snapshot method. Snapshot methods enable

NetBackup to create snapshots within the storage stack (such as the file system,

volume manager, or disk array) where the data resides. If the data resides in a

logical volume, NetBackup can use a volume snapshot method to create the

snapshot. If the data resides in a file system, NetBackup can use a file system

method, depending on the client OS and the file system type.

Many different technologies are available for creating snapshots, and many different

terms are used to refer to the underlying implementation of any given snapshot.

Common terms include clone, split-mirror, and copy-on-write. In this documentation,

the term "snapshot" designates any point-in-time, read-only copy of a primary

17Introduction

Snapshot Client features

volume, regardless of its underlying implementation. Method-specific terminology

is explained along with specific snapshot methods in other chapters of this guide.

In some cases, more than one method can make the snapshot. If the data resides

in a file system over a logical volume, NetBackup could use a file system method

or logical volume method. The choice of method might depend on the snapshot

features available in the storage subsystem where the data resides. Or, the choice

might depend on the requirements of the snapshot method itself. For example: if

the client data is in a VxFS file system over a VxVM volume, NetBackup could

create the snapshot with a file system method. On the other hand, NetBackup can

use a volume manager method to create the snapshot of the same data, such as

VxVM or FlashSnap. Between VxVM and FlashSnap, only FlashSnap supports the

Persistent FastResync feature of VxVM mirror volumes. To take advantage of the

Persistent FastResync feature, you would have to select the FlashSnap method.

About snapshot providers

Each snapshot method relies on the snapshot technology that is built into the storage

subsystem where the data is stored. Examples of storage subsystem are volume

manager, file system, or hardware disk array. NetBackup includes a set of Software

Libraries that are called "snapshot providers." The providers enable Snapshot Client

to access the snapshot technology in the storage subsystem.

Each snapshot provider is designed for a particular subsystem. For example, the

VxFS provider enables NetBackup to create snapshots of files in the Veritas File

System (VxFS). The VxVM provider does the same for the data that is configured

in Veritas Volume Manager volumes. The EMC CLARiiON disk array provider

enables NetBackup to create hardware snapshots in the CLARiiON array.

You specify the method in the NetBackup policy. When the policy runs, the snapshot

method calls the snapshot provider library. The provider then accesses the

underlying commands in the storage subsystem to create the snapshot.

Introduction

Snapshot Client features

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