Veritas NetBackup 8.1 Snapshot Client Admin Guide (UNIX, Windows, Linux)

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Veritas NetBackup 8.1 Administrator's Guide 是针对 UNIX、Windows 和 Linux 平台的 Veritas NetBackup Snapshot Client 的官方文档。该指南详细介绍了在 Veritas NetBackup 8.1 版本中如何管理和操作Snapshot Client，这是一个用于创建、管理以及应用快照的重要组件。Snapshot Client 是一款旨在提高数据备份效率和恢复性能的工具，通过在数据变化之前创建一致的映像，显著减少备份所需的时间和存储空间。该文档的核心知识点包括： 1. **快照技术**：Veritas NetBackup 提供基于磁盘的快照功能，允许管理员在不影响正常业务的情况下，捕获数据的某一时刻的状态，这对于灾难恢复和数据保护至关重要。 2. **安装与配置**：指南中详细描述了如何在不同操作系统上安装和配置Snapshot Client，包括设置环境变量、连接到备份服务器，以及配置客户端参数。 3. **创建和管理快照**：管理员可以学习如何根据需要创建快照，选择合适的快照策略，以及如何监控和管理快照的生命周期。 4. **数据一致性**：文档强调了如何确保在快照过程中数据的一致性，包括在并发写入和网络中断等情况下的处理机制。 5. **性能优化**：介绍了一些最佳实践，如调整缓存设置、优化I/O性能，以及如何根据硬件和工作负载调整Snapshot Client的配置。 6. **许可证与法律注意事项**：由于包含第三方软件，文档提醒用户在使用时需遵守Veritas Technologies LLC的版权和许可协议，同时提供了链接以获取开源或免费软件的相应授权信息。 7. **反编译/逆向工程限制**：产品分发受到许可证的约束，限制了用户对源代码的访问，特别是对于那些受开源或免费软件许可证控制的第三方程序。这本指南是Veritas NetBackup 8.1 Snapshot Client管理员必备的参考资料，它涵盖了从基础安装到高级管理的所有关键知识点，帮助用户高效地维护数据安全并优化备份流程。对于任何正在使用或计划采用 Veritas NetBackup 的组织，理解和掌握这些内容至关重要。

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.

16Introduction

Snapshot Client features

■ Backup of Oracle, Exchange, and DB2 database clients.

About block level incremental backup

Block level incremental backup enables NetBackup to back up only the changed

data blocks of VMware virtual machines and Oracle or DB2 database files. For

details, refer to the appropriate NetBackup database agent guide or to the NetBackup

for VMware Administrator's Guide.

About Snapshot Client and NDMP

Using the NDMP protocol version V4 snapshot extension, NetBackup Snapshot

Client can make policy-based snapshots of data on a Network Attached Storage

(NAS) host. The snapshot is stored on the same NAS device that contains the

primary client data. From the snapshot, you can restore individual files or roll back

an entire volume or file system, by means of Instant Recovery.

Note: NetBackup for NDMP add-on software is required, and the NAS vendor must

support snapshots.

About snapshot basics

The large active databases or file systems that must be available around-the-clock

are difficult to back up without incurring a penalty. Often, the penalty takes one of

the following forms:

■ To allow time for the backup, the entire database is taken offline or the file

system is unmounted. The result is suspension of service and inconvenience

to users.

■ The copy is made very quickly but produces an incomplete version of the data,

since some transactions have failed to complete.

A solution to this problem is to create a snapshot of the data. A snapshot captures

the data at a particular instant, without causing the client downtime. The resulting

capture or snapshot can be backed up without affecting the performance or

availability of the file system or database. Without a complete, up-to-date snapshot

of the data, a correct backup cannot be made.

When a NetBackup media server or third-party copy device manages the backup,

the data to back up must be contained in a snapshot. The backup agent can only

access the data by means of the raw physical disk. Once the data is captured as

a snapshot, the NetBackup client "maps" the logical representation of the data to

19Introduction

About snapshot basics

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