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Don Burleson Blog 







Oracle 11g release 2: ASM Cluster File System Snapshots

Oracle11g release 2Tips by Burleson Consulting
August 11, 2008

ASM Cluster File System Snapshots in 11gR2

by Lutz Hartmann, Oracle ACE

With Oracle 11gR2 ASM it is possible to create up to 63 image copies of file systems as a point in time capture. These snapshots a read only and can be used to view a file system as of the point in time in the past when they were created. The snapshots are persistent across system restarts and reside in ASM storage in the ACFS files system. Every time such a file system is created a folder .OFS/snaps is automatically created.

It is possible to create snapshots based on a regular interval.

These snapshots can be used as a backup and to restore files which have been deleted by mistake.

A command line tool is available to manage snapshots. Here are the commands:

advutil tune


ofsutil info

ofsutil registry

ofsutil rmfs

ofsutil size

ofsutil snap create

ofsutil snap delete

ofsutil tune


Oracle 11gR2 uses operating system driver modules ACFS, ADVM, and ACFS Snapshots which are dynamically loadable.


If you like Oracle tuning, you may enjoy my new book "Oracle Tuning: The Definitive Reference", over 900 pages of BC's favorite tuning tips & scripts. 

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