Veritas File System v5.0.1 Administrator's Guide for HP-UX 11i v3 (5900-0082, June 2010)

Storage Checkpoints

This chapter includes the following topics:

■ About Storage Checkpoints

■ How a Storage Checkpoint works

■ Types of Storage Checkpoints

■ Storage Checkpoint administration

■ Storage Checkpoint space management considerations

■ Restoring from a Storage Checkpoint

■ Storage Checkpoint quotas

About Storage Checkpoints

Veritas File System (VxFS) 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.

Chapter