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Oracle Tips by Burleson

Disk I/O Tuning

Chapter 3: HP-UX SCSI Tuning

Option

Sub-options  and Descriptions

-a

Display the status of all mode parameters available, separated by semicolon-blank (; ) or newline.

-c command

Cause the device to perform the specified command.  Command can be one of the following:

erase

 

For magneto-optical devices that support write without erase, this command can be used to pre-erase the whole surface to increase data throughput on subsequent write operations.  This command maintains exclusive access to the surface during the pre-erasure.

sync_cache

 

For devices that have an internal write cache, this command causes the device to flush its cache to the physical medium.

domain_val

 

Domain validation allows the user to check the quality of transmissions across the bus and helps to find problems like faulty and missing terminators, bad components, etc.  This command is only valid for Ultra160 and later devices.  If any errors encountered during domain validation, they will be logged in the syslog.

get_bus_parms

 

This command displays information about limits and negotiable parameters of a bus.

get_lun_parms

 

This command displays information about limits and negotiable parameters of a physical or a virtual peripheral device.

get_target_parms

 

This command displays information about limits and negotiable parameters of a target peripheral device.

reset_target

 

This command causes a target reset task management function to be sent to the associated target.

reset_bus

 

This command causes the system to generate a SCSI bus reset condition on the associated bus.  A SCSI bus reset condition causes all devices on the bus to be reset (including clearing all active commands on all devices).

 

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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