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Oracle Tips by Burleson

Disk I/O Tuning

Chapter 3: HP-UX SCSI Tuning

Set the mode parameter mode to value.  The available mode parameters and values are listed above.
Mode parameters that take only a binary value (
1 or 0) and can also be specified as either on or off, respectively.


Suppress the labels that are normally printed when mode parameters are displayed.  Mode parameter values are printed in the same order as they appear on the command line, separated by semicolon-blank (; ) or newline.

Table 3-3: The scsictl Command Options

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:

scsictl -a -m ir=1 -m ir /dev/rdsk/c0t6d0

producing the following output:

immediate_report = 0; queue_depth = 8;
immediate_report = 1

To get the same output using the suppression of labels, the command would look like so:

scsictl -aq -m ir=1 -m ir /dev/rdsk/c0t6d0

producing the following output:

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

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