Dell NetWorker 19.9 Administration Guide

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Requirements for VSF backups

Ensure that the environment meets the requirements for virtual synthetic full (VSF) backups.

The following table lists the requirements for VSF backups.

Table 1. Requirements for virtual synthetic full backups
Requirement	Details
DDOS version	Version 5.3 or later for both Data Domain systems and Data Domain Archivers.
DD Boost version	Version 2.6 or later.
Data Domain system configuration	Enable the `virtual-synthetics` option on the Data Domain system. To verify that `virtual-synthetics` is enabled, log in to the Data Domain system and type the following command: `ddboost option show` Ensure that a value of `enabled` appears next to the `virtual-synthetics` option in the output for the command. NOTE:If `virtual-synthetics` is disabled but all other requirements for VSF are met, then the VSF backup fails with errors. NetWorker does not perform a traditional synthetic full backup in this case.
Backup storage	All constituent backups for the VSF backup must be on the same Data Domain system. The save sets can be distributed across multiple storage nodes and located in different MTrees on the Data Domain system.
Client resource configuration	Enable the Client direct attribute on the General tab of the Client Properties dialog box for the client resource. You must select ViewDiagnostic Mode in the Administration interface to access the Client direct attribute in the Client Properties dialog box. Enable the Data Domain backup attribute on the Apps & Modules tab of the Client Properties dialog box for the client resource. To ensure optimal backup performance, configure the client to backup 10 or fewer save sets.
Device resource configuration	Specify a value in the volume location attribute for the device resource for the Data Domain system. NetWorker updates the volume location attribute during the device mount operation. NOTE:Before you update a storage node that uses Data Domain devices, unmount each device. Once the update completes, mount each device.
NetWorker upgrade requirements	If you upgrade the NetWorker client to release 8.1 or later from a release before 8.1, you must perform a full backup before you perform a VSF backup. Otherwise, file-by-file recovery fails.
Cloning requirements	The `virtual-synthetics` option must be enabled for Data Domain systems being used for cloning VSF backups. Otherwise, cloning fails.

The NetWorker and Data Domain Boost Integration Guide provides details on configuring the NetWorker environment for use with a Data Domain system.

Support for directives

Directives do not apply to VSF backups because the VSF backup is created by the Data Domain system.

Support for concurrent operations

The volume of concurrent VSF operations that a Data Domain system can handle depends on the model of the Data Domain system and the capacity of the NetWorker host. The following scenarios have been tested and verified to work:

Concurrent VSF backups.
A VSF backup concurrent with a cloning operation.
A VSF backup concurrent with clone-controlled replication.