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Disk I/O Tuning

Chapter 3: ATA Tuning In Windows

  1. Below the drop-down, you will see Current Transfer Mode.  This should display Ultra DMA Mode 2, 4 or 5 depending on your system

If DMA if available is already set, but the transfer mode shows PIO, toggle the setting by selecting PIO Only and click OK, then repeat the above steps.

  • Enable IDE Block Mode in the system BIOS.  This will allow the system to do multiple read/write operations simultaneously to improve throughput.  This will probably involve rebooting and then using the system specific keystrokes to enable your BIOS editor.  This can be called Block Mode, IDE Block Mode or Multi-Sector Transfer.  The setting for this range is from 0 to 32 sectors.  You need to verify that your drive will support this mode.  In a single read/write operation, the higher the settings the more blocks transferred,  thereby reducing the load on the system.

  • Make sure hard drives are not slaves to CD-ROMS or other ATA-EIDE devices.  Hard drives should always be the masters on an EIDE chain (usually the last drive in the chain is the master with cable-select).

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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