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Disk I/O Tuning

Chapter 3: ATA Tuning In Windows

Figure 2-8

: Final Defragmentation Screen

The final report from the defragmentation utility is shown in figure 2-9.  Compare the initial report with the final report and you can see significant reduction in the number of fragments, especially in the directories and system files.

Figure 2-10

: Final Fragmentation Report

To reduce the chance of fragmentation in Windows with Oracle, consider using raw partitions (partitions where Oracle handles the IO to the disk instead of the operating system).  Windows uses an optimistic write algorithm that writes blocks back to the first available location, not their original location, causing Windows to fragment from day one of operation.

Some claim that since the file system in Windows (or AIX or VMS) is designed to fragment, it performs better when fragmented.  This statement seems odd since every time you defragment in Windows (or AIX or VMS) your performance improves.  If this old SA tale where true, wouldn't performance get worse when you defragment?

The above text is an excerpt from:

Oracle Disk I/O Tuning
Disk IO Performance & Optimization for Oracle Databases



by Mike Ault

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