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NetVault Plug-in for VMware 11.2 - User Guide

Introduction 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

About quiescing virtual machines

A virtual machine can be quiesced to create consistent snapshots for backups. Quiescing is performed using the VMware VSS component, which is provided with VMware Tools. The VMware VSS component is automatically installed when you install VMware Tools on the virtual machines.

Quiescing is only supported on Windows®-based virtual machines. You can enable or disable quiescing of virtual machines.

Depending on the quiescing method used, the plug-in generates the following types of snapshots:

Crash-consistent snapshots: Crash-consistent snapshots capture the volume state as it would be after a power outage. Such snapshots are not guaranteed to be free of incomplete I/O operations or data corruption. During a restore, there can be some data loss or corruption that can cause application failure.
NOTE: On Linux®-based virtual machines, the plug-in always generates crash-consistent snapshots. You can install the VMware SYNC driver on Linux-based systems to freeze and thaw filesystem I/O and obtain a consistent snapshot that reduces the risk of data loss and data corruption after restore. However, creating quiesced snapshots using SYNC driver requires waiting for I/O to drain in the Guest OS. This activity can affect time-sensitive applications.
File-system-consistent snapshots: For file-system-consistent snapshots, all file system I/O is temporarily frozen and dirty memory data is flushed to the disk before the snapshot is taken.
VSS-based application-consistent snapshots: For application-consistent snapshots, all application data in memory is written to the disk. Application-consistent snapshots reduce the amount of application crash recovery that you need to be perform for VSS-enabled applications, like SQL Server®, Exchange, and SharePoint®, after restoring an image-level backup.

Enabling quiescing of virtual machines

Quiescing is only supported on Windows®-based virtual machines. You can set the backup preferences to enable quiescing for all or specific virtual machines.

1
Start the Backup Job Wizard, and click Create New next to the Selections list.
4
In the Backup Preferences dialog box, verify that the Quiesce VM for snapshot option is selected.

Disabling quiescing of virtual machines

On virtual machines with high CPU or IO load, the quiesce operation may time out and cause the backup job to fail. In such cases, you can disable quiescing for all or specific virtual machines. When you disable quiescing, the plug-in uses crash-consistent snapshots to perform backups.

1
Start the Backup Job Wizard, and click Create New next to the Selections list.
4
In the Backup Preferences dialog box, clear the Quiesce VM for snapshot option.

Removing backup preferences for a virtual machine

By removing backup preferences for a virtual machine, you can ensure that the plug-in automatically applies the server preferences to the individual virtual machine. If you enable or disable quiescing at the server level, the same setting is applied to the virtual machine for which the configuration has been removed.

1
Start the Backup Job Wizard, and click Create New next to the Selections list.
5
In the Actions list, click Remove Backup Preferences.
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