CBT

Simple definition

CBT follows the modified blocks of a VMware virtual disk.

Technical definition

Changed Block velance allows backup solutions to only read the modified blocks from a previous point.

What’s the point?.

accelerate the incremental backups of virtual machines.

Concrete example

a backup does not read all the VMDK after the first full.

Common problems

• C BT inconsistent.
• The problem of the new technology.
• Involuntary full fallback.

To be noted: Always adapt the diagnosis to the version of the product and to the architecture actually deployed.