Quantum vmPRO 4000 User's Guide download pdf (Page 111)

Chapter 2: vmPRO Setup and Configuration

vmPRO Advanced Settings

Quantum vmPRO User’s Guide 98

Settings

Disallowbackupswhenthereisnotenoughdatastorespaceforsnapshot

Select this setting to enable the vmPRO appliance to display an alert and stop a backup when the datastore

is at a certain percentage of its total accessible capacity.

In the Allownomorethan<x>%datastorecapacity field, enter the percentage at which the vmPRO

needs to display the alert and stop the backup.

3. Click OK to save settings and exit the dialog box.

HotAdd Transport and Your vmPRO Appliance

Quantum vmPRO supports vSphere's HotAdd Transport feature. With HotAdd Transport, you can add and

remove SCSI virtual hard disks while your vmPRO appliance is running. SCSI HotAdd provides a

convenient method for transporting virtual disk data from guest virtual machines (VMs) directly to the

ESX/ESXi host on which they are running. HotAdd improves performance and provides a non-network-

based method of transferring data from the source VM to your vmPRO appliance for backup purposes.

Enable HotAdd Transport in the AdvancedSettings dialog box. See Configuring Advanced Settings for a

vmPRO Appliance.

Note:For hypervisors under moderate to heavy system loads, Quantum tests show significant

performance improvement for backup throughput when HotAdd Transport is enabled.

Prerequisites

Ensure that the following prerequisites are met before enabling HotAdd Transport:

VMConditions

Before enabling HotAdd Transport, keep in mind that the HotAdd Transport feature can only access

VMs if one of the following conditions is met. If neither condition is met, the transport method

automatically reverts to the network block device (NBD) transport method.

Condition1

Target VMs that are on the same ESX server as the vmPRO appliance.

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Quantum vmPRO 4000 User's Guide Page 111