Veritas™ File System 5.0.1 Administrator's Guide

Storage Checkpoints
This chapter includes the following topics:
■ About Storage Checkpoints
■ How a Storage Checkpoint works
■ Types of Storage Checkpoints
■ Storage Checkpoint administration
■ Space management considerations
■ Restoring a file system from a Storage Checkpoint
■ Storage Checkpoint quotas
About Storage Checkpoints
Veritas File System provides a Storage Checkpoint feature that quickly creates a
persistent image of a file system at an exact point in time. Storage Checkpoints
significantly reduce I/O overhead by identifying and maintaining only the file
system blocks that have changed since the last Storage Checkpoint or backup via
a copy-on-write technique.
See “Copy-on-write” on page 87.
Storage Checkpoints provide:
■ Persistence through reboots and crashes.
■ The ability for data to be immediately writeable by preserving the file system
metadata, the directory hierarchy, and user data.
Storage Checkpoints are actually data objects that are managed and controlled
by the file system. You can create, remove, and rename Storage Checkpoints
because they are data objects with associated names.
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