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Oracle Tips by Burleson

Disk I/O Tuning

Chapter 3: HP-UX SCSI Tuning


Continue processing arguments even after an error is detected.  The default behavior is to exit immediately when an error is detected.

Command line syntax is always verified for correctness, regardless of the -k option.  Improper command line syntax causes scsictlto exit without performing any operations on the device.

-m mode

Display the status of the specified mode parameter.  Mode can be one of the following:



For devices that support immediate reporting, this mode controls how the device responds to write requests.  If immediate report is enabled (1), write requests can be acknowledged before the data is physically transferred to the media.  If immediate report is disabled (0), the device is forced to await the completion of any write request before reporting its status.



Equivalent to immediate_report.



For devices that support a queue depth greater than the system default, this mode controls how many I/Os the driver will attempt to queue to the device at any one time.  Valid values are (1-255).  Some disk devices will not support the maximum queue depth settable by this command.  Setting the queue depth in software to a value larger than the disk can handle will result in I/Os being held off once a QUEUE FULL condition exists on the disk.


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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