Data Protection
Snapshots
The Snapshot Process
Redirect-On-Write
1. Application writes data
2. Snapshot is taken—snapshot manager saves metadata
3. When application modifies data, snapshot manager redirects new
data to a different place on the disk (redirect on write)
4. Snapshot manager uses metadata to reconstruct original data
Primary storage
Application’s Original data
view of data
Modified data
Metadata
Snapshot
engine