Changed Block Tracking
The changed block tracking (CBT) mechanism allows Veeam Plug-in for Scale Computing HyperCore to reduce the amount of data read from processed VMs, and to increase the speed and efficiency of incremental backups:
- During a full backup session Veeam Plug-in for Scale Computing HyperCore reads only written data blocks, while unallocated data blocks are filtered out.
- During an incremental backup session, Veeam Plug-in for Scale Computing HyperCore reads only those data blocks that have changed since the previous backup session.
To detect unallocated and changed data blocks:
- During the first (full) backup session, Veeam Plug-in for Scale Computing HyperCore creates a snapshot of a VM using native Scale Computing HyperCore capabilities.
- During subsequent sessions, new snapshots are created. Veeam Plug-in for Scale Computing HyperCore compares the content of the snapshot created during the previous backup session and the snapshot created during the current backup session. This allows Veeam Plug-in for Scale Computing HyperCore to detect data blocks that have changed since the previous backup session.