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

Storage Checkpoints
How a Storage Checkpoint Works
Chapter 5 77
Figure 5-1 Primary Fileset and its Storage Checkpoint
In the figure below, each block of the file system is represented by a square. Similar to the previous figure,
this figure shows a Storage Checkpoint containing pointers to the primary fileset at the time the Storage
Checkpoint is taken.
Figure 5-2 Initializing a Storage Checkpoint
The Storage Checkpoint presents the exact image of the file system by finding the data from the primary
fileset. As the primary fileset is updated, the original data is copied to the Storage Checkpoint before the new
data is written. When a write operation changes a specific data block in the primary fileset, the old data is
first read and copied to the Storage Checkpoint before the primary fileset is updated. Subsequent writes to