Quantum vmPRO 4000 User's Guide download pdf (Page 99)

Chapter 2: vmPRO Setup and Configuration

vSphere Changed Block Tracking Support

Quantum vmPRO User’s Guide 86

a. Remove all snapshots from the appliance.

b. On the VMware vSphere Client console, enter the following command:

cbt reset <hypervisor> <VM>

VMTransfers

Transferring a VM with Storage vMotion disables CBT.

Standard vMotion (when only the ESX host changes for the VM, but the VM disk stays in the same

storage location) does not disable CBT.

LoadBalancing

Using vMotion on VMs for load balancing during a backup can cause the backup to fail if you do not have

one of the following:

l vmPRO 3.0.1 and newer

l vCenter Server version 5

In these versions, vMotion is disabled on the VMs prior to the start of the backup process.

For vCenter 4.x, you need to configure the VMs so that vMotion does not run during a backup.

MultiplevmPROAppliances

Multiple appliances cannot manage the same VM using CBT.

ActivatingandDeactivatingCBT

Activating or deactivating CBT on a VM triggers the immediate and simultaneous creation and removal

of a VM snapshot. This function is required by the VMware API.

The removal and creation of a snapshot for each VM can be a time-consuming process when activating

or deactivating CBT on multiple VMs.

CBTandRetentionSchedules

During differential disk backups, CBT needs to access data from the flat.vmdk file and the

corresponding database entry. For this reason, the retention schedule for the backup policy does not

initiate partial deletions of full backups. Instead, full backups,differential backups, and associated

database entries are deleted at same time by the same retention schedule.

Configuring CBT on a vmPRO Appliance

Do the following to configure Changed Block Tracking (CBT) on your vmPRO appliance:

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Quantum vmPRO 4000 User's Guide Page 99