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CHAPTER DOWNLOADS Oracle disk I/O tuning: HP-UX SCSI tuning, part 2 Mike Ault 08.26.2004 Rating: --- (out of 5) Digg This!     StumbleUpon     Del.icio.us    The following is part of a series on the different aspects of disk I/O performance and optimization for Oracle databases. Each tip is excerpted from the not-yet-released Rampant TechPress book, "Oracle disk I/O tuning," by Mike Ault. Check back to the main series page for upcoming installments. [TABLE]

HP-UX SCSI tuning

The scsictl command allows adjustment of the parameters for SCSI on a HP-UX platform. The basic format for the scsictl command is: The scsictl command recognizes the options listed in Table 3-3. [TABLE]

Mode parameters and commands need only be specified up to a unique prefix. When abbreviating a mode parameter or command, at least the first three characters must be supplied.

To display all the mode parameters, turn immediate_report on, and redisplay the value of immediate_report: producing the following output: To get the same output using the suppression of labels, the command would look like so: producting the following output: Remember, when the system is rebooted, the HP-UX

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disk3 and sdisk drivers always reset the value of the immediate_report mode parameter to OFF. If ioctl or scsictl is used to change the setting of immediate reporting on a SCSI device, the new value becomes the default setting upon subsequent configuration (e.g., opens) of this device and retains its value across system or device powerfail recovery. However, on the next system reboot, the immediate_report mode parameter is reset to the value of the tunable system parameter, default_disk_ir. This parameter is set in the system_file used to create the HP-UX system by the config command.

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Mike Ault is a SearchOracle.com expert and a senior Oracle consultant with Burleson Consulting, and one of the leading names in Oracle technology. The author of more than 20 Oracle books and hundreds of articles in national publications, Mike Ault has five Oracle Masters Certificates and was the first popular Oracle author with his landmark book "Oracle7 administration and management." Mike also wrote several of the "Exam Cram" books, and enjoys a reputation as a leading author and Oracle consultant. Ask Mike a question today!

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