enable hp posix async i/o enables or disables asynchronous I/O on database devices created on on HP-UX 11.31 and later file systems.
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Summary Information |
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Default value |
0 |
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Valid values |
1 (enabled), 0 (disabled) |
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Status |
Static |
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Display level |
Comprehensive |
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Required role |
System administrator |
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Configuration group |
Disk I/O |
You must first enable SAP ASE to use asynchronous I/O with the allow sql server async i/o configuration parameter.
The combination of these configuration parameters determines whether SAP ASE uses asynchronous or synchronous I/O for raw partitions and file systems:
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enable hp posix async i/o |
allow sql server async i/o = 0 |
allow sql server async i/o = 1 |
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Set to 0 |
Synchronous I/O for file systems Synchronous I/O for raw devices |
Synchronous I/O for file systems Uses /dev/async asynchronous I/O for raw devices |
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Set to 1 |
Synchronous I/O for file systems Synchronous I/O for raw devices |
POSIX asynchronous I/O for file systems POSIX asynchronous I/O for raw devices |