TopicVMware →
Simple definition
A VMware function that identifies the modified blocks of a virtual disk.
Technical definition
CBT allows backup software to request only blocks changed from a previous point.
What is it used for ?
Accelerate the incremental backups of VM.
Practical example
Veeam can use CBT to avoid re-binding the whole VMDK every job.
Common issues
- CBT Corrupt
- Reset required
- Snapshot or restoration disrupts monitoring
Related terms
Key takeaway: Exact behavior and commands may vary depending on versions, products and architectures.