NetBackup 7.7开放式存储解决方案指南

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《NetBackup 7.7 OST Disk Guide》是一份文档，版权属于Symantec Corporation。该文档详细介绍了Symantec NetBackup™ OpenStorage SolutionsGuide for Disk的内容，包括UNIX、Windows和Linux平台上的使用指南。该产品受限于许可证，禁止未经Symantec Corporation和其许可方事先书面授权的情况下以任何方式复制、分发和反编译/逆向工程。Symantec、Symantec标志、勾号标志、NetBackup、Veritas和Veritas标志是Symantec Corporation或其关联公司在美国和其他国家的商标或注册商标。其他名称可能是其各自所有者的商标。该文件是对Symantec NetBackup™ OpenStorage SolutionsGuide for Disk的版本7.7进行了详细文档化，内容包括了法律声明和版权声明等。

API specification. The vendor exposes the storage capabilities to NetBackup through

the plug-in.

To determine a disk appliance’s capabilities, NetBackup uses the plug-in to query

the storage appliance. Capabilities can include deduplicated storage, optimized

off-host duplication, and so on.

If a vendor updates their plug-in, you must update NetBackup with the new or

changed capabilities exposed by the plug-in.

See “Updating an OpenStorage storage server to reflect plug-in updates”

on page 90.

For disk appliance storage, the appliance vendor provides the plug-in. The vendor

should provide information about how to install the plug-in.

About OpenStorage disk pools for backups

An OpenStorage disk pool represents the disk storage that is exposed to NetBackup

through the OpenStorage API. A disk pool is the storage destination of a NetBackup

storage unit.

For disk appliance storage for backups, the vendor may expose the storage as one

or more units of storage (that is, disk volumes). The vendor also may expose the

volume properties that are related to replication.

A disk pool can represent one or more volumes. If a disk pool represents more than

one volume, NetBackup selects a volume for a backup based on the available

capacity and the predicted size of the backup. NetBackup tries to write backup data

to a single volume. If necessary, backup images span volumes in a disk pool unless

the storage implementation does not support volume spanning. Backup images do

not span across multiple disk pools.

See “About spanning volumes in OpenStorage disk pools” on page 18.

How many disk pools you configure depends on your storage requirements. It also

depends on whether or not you use optimized duplication or replication, as follows:

16Planning your deployment

About OpenStorage disk pools for backups

About spanning volumes in OpenStorage disk pools

One of the capabilities a vendor may expose is the potential for images to span

across volumes within a disk pool. NetBackup uses that capability to use the disk

storage most effectively. NetBackup breaks up backup images into fragments and

stores a fragment or fragments if a full image does not fit into the space available.

In NetBackup, the SpanImages attribute specifies that backup images can span

across volumes in a disk pool. The SpanImages attribute applies to both storage

servers and disk pools.

Volume spanning is not a trait that the OpenStorage vendor plug-in exposes.

Therefore, by default NetBackup does not include the SpanImages attribute on

storage servers and disk pools. You must set the SpanImages attribute on the

storage server and the disk pools so that backup images span volumes.

See “Setting OpenStorage storage server attributes” on page 89.

See “Setting OpenStorage disk pool attributes” on page 103.

NetBackup does not support disk volume spanning for replication. NetBackup fails

backup jobs to the disk pools that span volumes if the backup job is in a storage

lifecycle policy that also contains a replication operation.

About OpenStorage optimized duplication and

replication

If an OpenStorage disk appliance can copy the data on one appliance to another

appliance of the same type, NetBackup can use that capability. The following table

lists the duplication methods in NetBackup that can use the functionality:

Table 2-2

NetBackup OpenStorage duplication and replication methods

DescriptionMethod

See “About OpenStorage optimized

duplication within the same domain”

on page 62.

Dupliation within the same NetBackup domain

See “About NetBackup Auto Image

Replication” on page 67.

Replication to a remote NetBackup domain

About OpenStorage optimized synthetic backups

One of the capabilities a vendor may expose is the disk appliance's potential to

construct synthetic backup images. A media server uses messages to instruct the

18Planning your deployment

About OpenStorage optimized duplication and replication

storage server which full and incremental backup images to use when creating the

synthetic backup. The storage server constructs (or synthesizes) the backup image

directly on the disk storage. In NetBackup, backups created in this way are known

as optimized synthetic backups.

The OpenStorage optimized synthetic backup method provides the following benefits:

■ Faster than a synthetic backup.

Regular synthetic backups are constructed on the media server. They are moved

across the network from the storage server to the media server and synthesized

into one image. The synthetic image is then moved back to the storage server.

■ Requires no data movement across the network.

Regular synthetic backups use network traffic.

■ Uses fewer disk resources, depending on the vendor implementation.

The storage vendor determines the storage implementation. If the disk appliance

uses data deduplication, duplicate data is not created and stored.

In NetBackup, the Optimizedlmage attribute enables optimized synthetic backup.

It applies to both storage servers and disk pools.

If the original vendor plug-in exposed optimized synthetic backup functionality, the

storage server and disk pools inherited that functionality. However, if your

OpenStorage vendor updates their plug-in to add optimized synthetic backup

functionality, you have to update NetBackup.

See “Adding OpenStorage functionality to an existing environment” on page 86.

The following table describes the requirements and limitations for OpenStorage.

Table 2-3

OpenStorage requirements and limitations

DescriptionWhat

The following are the requirements for optimized synthetic backups:

■ The master and the media servers are at NetBackup version 6.5.4

or later.

■ The Data Protection Optimization Option license key is installed on

the NetBackup master server.

■ The plug-in from the disk appliance vendor supports the

OpenStorage OptimizedImage attribute.

■ The vendor plug-in is installed on each media server that connects

to the storage appliance.

■ The target storage unit's disk pool is the same disk pool on which

the source images reside.

Requirements

NetBackup does not support storage unit groups as a destination for

optimized synthetic backups.

Limitations

19Planning your deployment

About OpenStorage optimized synthetic backups

About storage unit groups for OpenStorage

You can use a storage unit group as a backup destination for OpenStorage storage.

A storage unit group must contain only the storage units that have the same type

of OpenStorage appliance as the storage destination.

Storage unit groups avoid a single point of failure that can interrupt backup service.

The best storage savings occur when a backup policy stores its data in the same

deduplication destination disk pool instead of across multiple disk pools. For this

reason, the Failover method for the Storage unit selection uses the least amount

of storage. All of the other methods are designed to use different storage every

time the backup runs. Symantec recommends that you select the Failover method

for the Storage unit selection type.

Table 2-4

Requirements and limitations for storage unit groups

DescriptionWhat

A group must contain storage units of one storage destination type only.Requirements

NetBackup does not support the following for storage unit groups:

■ Optimized duplication of deduplicated data. If you use a storage unit

group as a destination for optimized duplication of deduplicated

data, NetBackup uses regular duplication.

See “About OpenStorage optimized duplication within the same

domain” on page 62.

■ Optimized synthetic backups. If NetBackup cannot produce the

optimized synthetic backup, NetBackup creates the more

data-movement intensive synthetic backup.

See “About OpenStorage optimized synthetic backups” on page 18.

Limitations

About OpenStorage direct to tape

OpenStorage direct to tape lets you copy NetBackup backup images directly from

a disk appliance to tape. The copy operation does not use NetBackup media server

I/O.

NetBackup manages the copied images based on retention periods you define.

Direct to tape uses the Network Data Management Protocol (NDMP) for the copy

operations. Direct to tape requires specific NDMP features and release levels.

See “About NDMP requirements for OpenStorage direct to tape” on page 21.

NetBackup media servers manage the operations. The media servers require the

NetBackup for NDMP software and specific NetBackup release levels.

20Planning your deployment

About storage unit groups for OpenStorage

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