VERITAS File System 4.1 Administrator's Guide

Storage Checkpoints
How a Storage Checkpoint Works
Chapter 5 93
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 the specified data block on the