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Comparing ASM to Filesystem in benchmarks (Doc ID 1153664.1)

Last updated on MAY 20, 2021

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 12.2]
Oracle Database - Standard Edition - Version to [Release 10.2]
Oracle Database - Enterprise Edition - Version to [Release 12.1]
Oracle Database Cloud Schema Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Information in this document applies to any platform.


There has been alot of incorrect methods on measuring performance between filesystems and ASM. This is particularily important for customers migrating from filesystem to an ASM based environment.  This document will, at a high-level, review the typical pitfalls when comparing or benchmarking filesystems to ASM.


The audience for this paper is System Admins and DBAs


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In this Document
 ASM Performance vs. Filesystems
 Filesystem performance vs. ASM
 Leveling the playing field:
 Filesystem features and ASM
 o Read ahead pre-fetch
 o Filesystem Write I/O coalescing
 o Filesystem DirectIO

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