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NetVault Backup Plug-in for VMware 12.3 - User Guide

Introducing NetVault Backup Plug-in for VMware Installing the plug-in Configuring the plug-in Defining a backup strategy Using the image-level backup method Using the file-level backup method Restoring image-level backups Restoring file-level backups Troubleshooting

Data backed up and restored for different disk types

The Plug‑in for VMware includes the following data in CBT-enabled backups and restores.

Thin

(Required space supplied and zeroed out on demand.)

Only used disk sectors are backed up.

Only changed disk sectors are backed up.

Only used sectors are restored.

Only used disk sectors are restored. Each sector is restored only once.

Zeroed Thick

(All space allocated at creation time, unused part zeroed out on first write.)

Only used disk sectors are backed up.

Only changed disk sectors are backed up.

Only used sectors are restored.

Only used disk sectors are restored. Each sector is restored only once.

Eager Zeroed Thick

(All space allocated and zeroed out at creation time.)

All disk sectors are backed up.

Only changed disk sectors are backed up.

The entire disk is restored.

The entire disk is restored. Each sector is restored only once.

Virtual Compatibility RDM (Raw Device Mapping)

All disk sectors are backed up.

Only changed disk sectors are backed up.

The entire disk is restored.

The entire disk is restored. Each sector is restored only once.

Network File System (NFS)

All disk sectors are backed up.

Only changed disk sectors are backed up.

The entire disk is restored.

The entire disk is restored. Each sector is restored only once.

When you restore a non-CBT backup, all blocks are restored and allocated. After a disk is restored from a non‑CBT backup, subsequent CBT-enabled Full Backups back up the entire disk.

RDM disks

The following table describes how the plug-in handles Raw Device Mapping (RDM) disks.

Physical compatibility mode

The disk is not backed up. Warning messages are written to the NetVault Backup binary logs and job logs.

Virtual compatibility mode (Independent disks)

The disk is not backed up. Warning messages are written to the NetVault Backup binary logs and job logs.

Virtual compatibility mode

The disk is backed up, but the data can only be restored to a flat file. Warning messages about the change in type are written to the NetVault Backup binary logs and job logs.

Optionally, you can omit the RDM disks in virtual compatibility mode during a restore.

1
Open the vmware.cfg file in a text editor.
You can find this file in <NetVault Backup home>\config on Windows and <NetVault Backup home>/config on Linux.

Backup and recovery strategy

A well-designed backup strategy helps you to recover from the damages caused by failure and resume normal operations as quickly as possible. Before you start backing up your data, ensure that a good strategy is in place that safeguards your data against various failure modes, such as media failure, data corruption, user error, and complete loss of a data center.

Your backup plan should define what backup methods are used, when and at what intervals the backups are performed, how backups are stored, how long backups are retained, and how the backup media are reused.

The following are some example backup sequences to offer you guidelines:

Full Backups only: You can choose to perform only Full Backups if the backup size is small, backup window is not an issue, or storage media is not a constraint. In such scenarios, you can schedule Full Backups every night or every N hours depending on the frequency of updates.
Full and Incremental Backups: For quicker backups and minimum use of storage media, you can include Full and Incremental Backups in your strategy. For example, you can schedule Full Backups every Sunday and Incremental Backups every day or every N hours depending on the frequency of updates.
Full and Differential Backups: For quicker restores and reduced media usage, you can include Full and Differential Backups in your strategy. For example, you can schedule Full Backups every Sunday and Differential Backups every day or every N hours depending on the frequency of updates.

Using the image-level backup method

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