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NetVault Plug-in for VMware 11.1 - 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

Enabling CBT on individual virtual machines

By default, CBT is disabled on a virtual machine. If you want to perform Incremental or Differential Backups of virtual machines, you must enable CBT for the Full Backup that serves as the base backup for subsequent Incremental and Differential Backups.

The Plug‑in for VMware provides the following methods to enable CBT on virtual machines:

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Enable CBT on specific virtual machines: To enable CBT on specific virtual machines, you can use the Enable Change Block Tracking method, which can be accessed from the Actions list on the NetVault Backup Selections page. This section describes the procedure for enabling CBT on individual virtual machines.
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Enable CBT on all virtual machines included in a backup: To automatically enable tracking on all virtual machines that are included in a backup job, you can set the backup option “Enable Changed Block Tracking for VM. For more information, see Performing image-level backups, Enable Changed Block Tracking for VM.
To enable CBT on a virtual machine
1
Start the Backup Job Wizard, and click Create New next to the Selections list.
2
Open the NetVault Backup Client on which plug-in is installed, and then open VMware Plugin.
3
Open the ESX/ESXi or vCenter Server and the other applicable container nodes (for example, Datacenter, Cluster, Resource Pool, and other nodes) to display the target virtual machine.
4
Select the virtual machine, and in the Actions list, click Enable Change Block Tracking.
This option is available to only those virtual machines on which CBT is disabled.
5
After the virtual machine is reconfigured, a message is displayed. Click OK to close the dialog box.
Important notes
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To create the first Full Backup of a virtual machine with Changed Block Tracking enabled, the target virtual machine must be powered off to enable CBT. For more information, see http://kb.vmware.com/kb/1031873.
The virtual machine can be restarted as soon as the backup job starts transferring data. During subsequent Full, Incremental, or Differential Backups, the virtual machine can remain powered on.
•
At the time of enabling CBT, no snapshots should exist on the target virtual machine. For more information, see http://kb.vmware.com/kb/1033816.
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The re-configuration of Changed Block Tracking takes effect only after the virtual machine goes through a stun and unstun cycle, including power-on, resume after suspend, migrate, or snapshot create, delete, or revert operations.
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Once you enable CBT for a virtual machine, all subsequent Full, Incremental, and Differential Backups are performed as CBT-based backups for that virtual machine. You do not have to enable CBT for each job.

Disabling CBT on a virtual machine

Once you enable CBT on a virtual machine, all subsequent Full, Incremental, and Differential Backups are performed as CBT-based backups for that virtual machine. To stop using CBT, you must disable this feature.

To disable CBT on a virtual machine
1
Start the Backup Job Wizard, and click Create New next to the Selections list.
2
Open the NetVault Backup Client on which plug-in is installed, and then open VMware Plugin.
3
Open the ESX/ESXi or vCenter Server and the other applicable container nodes (for example, Datacenter, Cluster, Resource Pool, and other nodes) to display the target virtual machine.
4
Select the virtual machine, and in the Actions list, click Disable Change Block Tracking.
This option is available to only those virtual machines on which CBT is enabled.
5
After the virtual machine is reconfigured, a message is displayed. Click OK to close the dialog box.

Manually disabling CBT on a virtual machine

To manually disable CBT on a virtual machine, use the following procedure.

To manually disable CBT on a virtual machine
1
Power off the virtual machine.
2
In the virtual machine's configuration (“.vmx”) file, edit the following entry and set it to False:
ctkEnabled = “False”
3
In the “.vmx” file for each virtual disk, edit the following entry and set it to False:
scsix:x.ctkEnabled = “False”
4
Create and delete a snapshot for the virtual machine to complete a stun and unstun cycle.
The “.ctk” files for the virtual machine are automatically deleted when you power on the virtual machine.

Enabling or disabling quiescing of virtual machines

This section includes the following topics:

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About quiescing virtual machines
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Enabling quiescing of virtual machines
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Disabling quiescing of virtual machines
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Removing backup preferences for a virtual machine
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