ACFS Technical Overview and Deployment Guide

There is a big movement in the industry towards Consolidation, Grid and Cloud Computing. At the core ofall this is centralized-clustered storage which requires a centralized file store, such as a filesystem.

Oracle released a proprietary cluster filesystem called Automatic Storage Management (ASM) starting inOracle Database 10g Release 1. Those exposed to ASM, knew it was truly a revolutionary storagecontainer for database files.

In Oracle Grid Infrastructure 11g Release 2, Oracle extends the capability of ASM by introducing the ASMCluster Filesystem, or ACFS. ACFS is feature-rich, scalable, POSIX-compliant filesystem that is builtfrom the traditional ASM disk groups. ACFS is built on top of the standard vnode/VFS filesystem interfaceubiquitous in the Unix/Linux world, thus ACFS uses standard file related system calls like otherfilesystems in the market. However, most filesystems on the market are platform specific; this isespecially true of cluster filesystems. ACFS is a multi-platform filesystem that runs on any platform thatcurrently runs ASM.

This document discusses ACFS and the underlying architecture. It is assumed that the reader has somefamiliarity with ASM and has read the ASM Technical Overview and Best Practices paper.Also, this document mainly covers the deployment of ACFS in a Linux environment. For Windowsconfigurations please see the Oracle Storage Administrator’s Guide for the appropriate commands.

With advent of ACFS, Oracle ASM 11g Release 2 has capability to the manage all data, including Oracledatabase files, Oracle Clusterware files and non-structured, general-purpose data such as log files and textfiles. ASM simplifies, automates and reduces cost and overhead by providing a unified and integratedsolution stack for all file management needs eliminating the need for 3rd party volume managers, filesystems and clusterware platforms.

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