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Oracle Tips by Burleson

Disk I/O Tuning

Chapter 3: SUN Conclusions for SCSI Interface Tuning

In order to have a properly tuned interface, you must make sure the proper SCSI options are set at the system (/etc/system) and bus as well as device level (scsi_options).  Make sure that the proper command queued depth (sd_max_throttle) and proper command delay times (sd_io_time) are set.  In a mixed environment (multiple SCSI devices with different queue depths and IO considerations) set these at the device level or the entire SCSI system or bus will be drug down to the performance of the least powerful device.  Finally, try to isolate tape or other low speed devices on their own SCSI bus as their device numbers are usually set to 6, which causes them to usurp service from other devices in the chain.


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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