NetVault Plug-in for VMware 13.2.1


	NOTE: During restores, the SAN transport mode offers the best performance on thick disks. On thin disks, the NBD and NBDSSL transport modes are faster than the SAN mode. During SAN restores, disable CBT on the virtual machine.

HotAdd mode

To use the HotAdd transport mode, the plug-in must be installed in a virtual machine.

The HotAdd method involves creating a linked clone of the target virtual machine and attaching the virtual drives to the backup proxy, which allows the disks to be read locally. However, these operations incur some overhead on the ESXi host, so the HotAdd mode is not as efficient as the SAN mode.

The HotAdd mode supports all types of storage devices. This mode does not require you to expose SAN LUNs to the NetVault Client.

HotAdd mode requirements

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To use the SCSI HotAdd mode, the backup proxy virtual machine must reside on the same datacenter as the target virtual machines — that is, the virtual machines that you want to back up.

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The ESXi Server that hosts the backup proxy must have access to the datastores on which the backup proxy and target virtual machines reside.

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The virtual machines must use SCSI controller; the HotAdd mode does not support IDE and SATA controllers.

LAN mode

To use the LAN mode, the plug-in can be installed either on a physical machine or in a virtual machine.

The LAN mode uses the NBD or NBDSSL protocol to access virtual drives. The ESXi Server Host reads data from the storage device, and sends the read data across a network channel to the plug-in. The NBD transport mode performs unencrypted data transfers and can be used if the ESXi Server and Plug‑in for VMware reside on a secure isolated network. NBD is faster than NBDSSL, and takes fewer resources on the ESXi Server and backup proxy. The NBDSSL transport mode uses SSL to encrypt all data passed over the TCP connection and can be used to protect sensitive data.

The LAN transport mode supports all types of storage devices. You can use the LAN transport mode if the ESXi Server uses local storage devices or NAS to store its virtual machine disks.

LAN mode requirements

To use secure communication channels (NBDSSL), enable SSL certificate verification in your virtual environment.

Enhancing the CDP scheduling with jobs having many VMs in the selection

For limiting the load on VMware Vcenter/ESXi, the config parameter 'MaxConcurrentSnapshotsPerJob' is introduced. Tuning this parameter sets the limit on concurrent VM snapshots. This is an optional parameter and a stanza is not added by default in vmware.cfg file. You need to add an entry in the config file explicitly.

Setting this parameter to 0 does not set any limit and the plugin continues to work as if this parameter is not set.

[Custom:MaxConcurrentSnapshotsPerJob]

Value=5

Configuring default settings

In the navigation pane, click Create Backup Job, and then click

next to the Selections list.

Open the NetVault Client on which the plug-in is installed.

Click VMware Plugin, and select Configure from the context menu.

NOTE: You can also configure the default settings from the Change Settings page:

In the Navigation pane, click Change Settings.

If the plug-in is installed on the NetVault Server, click Server Settings.

— or —

If the plug-in is installed on a NetVault Client, click Client Settings; in the clients table, select the client, and click Next.

Under Plugins, click Plugin Options.

Under Plug‑in for VMware, configure the following settings:

Option

Description

Transport Mode

Select the transport mode for accessing virtual machine disks. The supported modes are:

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SAN

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HotAdd

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NBD or NBDSSL

For more information about transport modes, see Supported transport modes.

To use the most suitable transport mode automatically, select Auto. On new plug-in installations, the Auto transport mode is selected by default.

Fallback Transport Mode

In the Fallback Transport Mode list, select the transportation mode that is used when the primary transportation mode fails. The available options are nbd, nbdssl, and none. If no alternative is available, select none.

On new plug-in installations, the fallback transport mode is set to nbd by default.

On upgrade installations, the fallback transport mode is set to nbdssl if the mode was set to san or hotadd mode before upgrade.

Default Inventory View

Plug‑in for VMware provides two View Types to browse the VMware inventory objects on the NetVault Selections page:

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Hosts and Clusters: The Hosts and Clusters view is the default inventory view for the Plug‑in for VMware.

The Hosts and Clusters view provides a hierarchical view of the hosts, clusters, and their child objects. In a cluster setup managed by a vCenter Server, the virtual machines are displayed under the Cluster node. In a standalone ESXi Server setup, the virtual machines are displayed under the individual hosts.

The Hosts and Clusters view does not display the folders created on the vCenter Server.

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VMs and Templates: The VMs and Templates view provides a flat view of all virtual machines and templates in the inventory; the virtual machines are grouped by Datacenters and folders.

NOTE: To switch between the two views, select the ESXi or vCenter Server on the NetVault Selections page, select Toggle Inventory View from the context menu. This option is only available when the server node is open.

Progress Statistics Update Interval

This setting determines the interval at which the plug-in updates progress statistics on the Monitor Job page. The default value for this option is 10 seconds. To change the default interval for progress updates, type or select a new value. The progress interval is specified in number of seconds.

NOTE: Frequent progress updates can have a negative impact on the performance of the plug-in.

Read Block Size

This setting specifies the number of disk sectors to read or write per operation. The default value is 65536 sectors (one sector = 512 bytes; 65536 sectors = 32 MiB). Setting a large block size for read and write operations can improve backup performance.

Enable virtual machine locking

If a virtual machine is migrated — for example, through Storage vMotion — while a backup or restore job is in progress, it can cause a job to fail. It can also create orphaned virtual drives on the datastores.

You can use this option to enable locking of virtual machines against Storage vMotion during backup and restore operations. The virtual machines are locked before a job starts and unlocked after the job completes.

This check box is selected by default.

Attempts to acquire lock

This option specifies the maximum number of attempts that are made to lock a virtual machine against Storage vMotion.

The default value for this option is 10.

Continue without lock

By default, the backup of a virtual machine fails if it cannot be locked against Storage vMotion.

When you select this check box, the plug-in continues to try to back up the virtual machine after the attempts to acquire a lock fail.

Working Directory

The Working Directory is used for the following purposes:

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To mount virtual machine volumes during file-level browse and backup operations.

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To store the data temporarily while restoring legacy backup savesets created with Plug‑in for VMware 1.x.

The default path for the Working Directory is <NetVault home>\tmp on Windows and <NetVault home>/tmp on Linux. To change the location, specify the full path. If you specify a path that does not exist, the plug-in automatically creates it on the NetVault machine.