Quantum vmPRO 4000 User's Guide download pdf (Page 97)

Chapter 2: vmPRO Setup and Configuration

vSphere Changed Block Tracking Support

Quantum vmPRO User’s Guide 84

5. After the upgrade completes, extract the RPM files from the 2-of-2 zip file and place them in the

vmPRO appliance's \quantum-upgrade folder.

6. Access the vmPRO appliance's VMware vSphere Client console.

At the command line, enter system upgrade local.

8. Confirm the upgrade, which starts automatically after confirmation.

9. Start a new instance of the vmPRO appliance's GUI to see the updates.

vSphere Changed Block Tracking Support

vSphere's Changed Block Tracking (CBT) identifies the disk blocks that have changed on a virtual machine

(VM) since the previous backup, allowing the vmPRO appliance to back up VMs at a differential level.

Differential-level backups export only the data that has changed since the last full backup, as opposed to

backing up the entire VM disk. When you use CBT with SmartMotion backups, both network I/O and backup

times are reduced.

CBT Cycle

WhenCBTisenabledforaVM,thevmPROappliancecreatestwokindsoffilesinthe/exportfile

system:

l A file for each base disk (identified by -flat.vmdk), which contains the full disk backup.

l A CBT file (identified by -pancbt.vmdk) for each base disk. The CBT file contains the changed blocks for

the corresponding base disk.

ThevmPROapplianceperformsdifferential-levelbackupswithCBTasfollows:

1. Using SmartMotion backups, the vmPRO appliance performs a full disk backup following the CBT reset

time. The CBT reset time indicates when to initiate a full disk backup, thus resetting the CBT cycle. For

more information about CBT reset times, see Configuring CBT on a vmPRO Appliance.

2. After the full backup, the vmPRO appliance runs differential backups on the disk until the next reset

time, at which point the vmPRO appliance runs another full disk backup to replace the previous full disk

backup.

Note:Keep in mind that the base disk's modification time is the start of the reset time, while the

CBT files have newer modification times.

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Quantum vmPRO 4000 User's Guide Page 97