VERITAS File SystemÖ 3.5 (HP OnlineJFS/JFS3.5) AdministratorÆs Guide (December 2002)

Chapter 5
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5 Storage Checkpoints
Storage Checkpoints are a feature of the VERITAS File System (VxFS) that provide point-in-time images of
file system contents. These frozen images of VxFS file systems can be used in a variety of applications such as
full and incremental online backups, fast error recovery, and product development testing. Storage
Checkpoint replicas of real time databases can also be used for decision support and an assortment of
database analyses.
NOTE You can use Storage Checkpoints only on file systems using the Version 4 disk layout; if you
are using an older disk layout, you must upgrade to use this feature (see the vxupgrade (1M)
and vxfsconvert (1M) manual page for information on how to upgrade the VxFS disk layout).
The following topics are covered in this chapter:
• What is a Storage Checkpoint?
• How a Storage Checkpoint Works
• Types of Storage Checkpoints
— Data Storage Checkpoints
— Nodata Storage Checkpoints
— Removable Storage Checkpoints
— Non-mountable Storage Checkpoints
• Storage Checkpoint Administration
— Creating a Storage Checkpoint
— Removing a Storage Checkpoint
— Accessing a Storage Checkpoint
— Converting a Data Storage Checkpoint to a Nodata Storage Checkpoint
• Space Management Considerations