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Oracle Tips by Burleson |
Disk I/O Tuning
Chapter 3:
HP-UX SCSI Tuning
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-k
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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. |
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-m mode
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Display the status of the specified mode
parameter. Mode can be one of the following:
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immediate_report
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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. |
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Ir
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Equivalent to
immediate_report. |
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queue_depth
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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. |
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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
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