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Oracle Tips by Burleson

Disk I/O Tuning

Chapter 3: Conclusions

Tuning disk interfaces generally involves controlling the number of commands that are sent to each disk on the interface.  These commands are controlled via the mechanism of queued command depths where the number of commands sent to either a bus or device is preset to prevent command overflows. Another setting throttles the total flow of commands on the bus to individual devices and provides for load balancing (sd_max_throttle for example).  When the disk interface senses errors, it usually throttles back to the minimal settings (usually 1), which can severely inhibit performance.


IEEE1394 Firewire/ilink, XILINX, ESP - Emerging Standards and Protocols, PowerPoint Presentation, FAQ section

SunSolve Document ID: 1227

QLogic Corporation QLA2100F PCI Fibre Channel Adapter


HP-UX Reference, HP-UX 11i Version 1.6, Customer Order Number: ONLINE ONLY, HP Part Number:B3921-90010, June 2002, Printed in USA, Copyright 1983-2002 Hewlett-Packard Company.  All rights reserved.

AIX Versions 3.2 and 4 Performance Tuning Guide, Fifth Edition (April 1996), IBM Corp.

AIX 5L Version 5.1, Performance Management Guide, Third Edition (April 2002), Copyright International Business Machines Corporation 1997, 2002

The above text is an excerpt from:

Oracle Disk I/O Tuning
Disk IO Performance & Optimization for Oracle Databases
ISBN 0-9745993-4-4 

by Mike Ault

Oracle Consulting Services

Burleson Oracle Consulting offers Senior Oracle consultants which are available for all areas of Oracle support.  Common Oracle consulting support activities include short-term Oracle tuning, Oracle database troubleshooting, Oracle9i and Oracle10g migration, Oracle9iAS App Server consulting, Oracle design reviews and Oracle requirements evaluation support. Oracle support and Oracle consulting services are priced by the hour, so you only pay for what you need. These one-time Oracle consulting services commonly include:

  • Answering questions from your Oracle DBA technical staff

  • Repairing down production Oracle database systems

  • One-time Oracle tuning evaluation

  • Guru support for your Oracle DBA

  • Installation of Oracle application packages

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