Veritas Volume Manager 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

Chapter 9, Administering Volume Snapshots
Cascaded Snapshots
271
Using a Snapshot of a Snapshot to Restore a Database
Original
volume
vxsnap make source=V
Snapshot
volume of V:
vxsnap make source=S1
vxsnap restore V source=S2
Apply redo logs
1. Create instant snapshot S1 of volume V
2. Create instant snapshot S2 of snapshot S1
3. After contents of volume V have gone bad, apply the database redo logs to snapshot S2
4. Restore contents of volume V instantly from snapshot S2 and retain S1 as a stable copy
VS1
Original
volume
V
Snapshot
volume of V:
S1
Snapshot
volume of V:
S1
Snapshot
volume of V:
S1
Original
volume
V
Original
volume
V
Snapshot
volume of S1:
S2
Snapshot
volume of S1:
S2
Snapshot
volume of S1:
S2