Difference between revisions of "Veritas vxfs filesystem performance"
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Unable to open file in DIRECTIO_ON mode, error: (25) Inappropriate ioctl for device | Unable to open file in DIRECTIO_ON mode, error: (25) Inappropriate ioctl for device | ||
| − | To get the best performance I ran some tests with different mount options. | + | To get the best performance out of this type of filesystem I ran some tests with different mount options. |
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A normal mount has these options set: read/write/nosuid/delaylog/largefiles/ioerror=mwdisable | A normal mount has these options set: read/write/nosuid/delaylog/largefiles/ioerror=mwdisable | ||
Additional mount options used in the test were: mincache=direct and convosync=direct | Additional mount options used in the test were: mincache=direct and convosync=direct | ||
| − | See below graphs for a quick overview of the resulting throughput. | + | See below graphs for a quick overview of the resulting throughput. For each bar the specific Sybase device settings are given (dsync / directio), as well as the Vertitas mount options. A higher bar means better throughput. |
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| + | [[Image:Read_vxfs.jpg]] | ||
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| − | [[Image: | + | [[Image:Write_vxfs.jpg]] |
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[[Category:ASE]] | [[Category:ASE]] | ||
Latest revision as of 12:31, 29 April 2007
In an attempt to use the direct I/O feature of Sybase ASE 15 on a Veritas filesystem I ran into a couple of issues. It seems that direct i/o is not possible on this type of filesystem. You will see this in the errorlog:
Unable to open file in DIRECTIO_ON mode, error: (25) Inappropriate ioctl for device
To get the best performance out of this type of filesystem I ran some tests with different mount options.
A normal mount has these options set: read/write/nosuid/delaylog/largefiles/ioerror=mwdisable Additional mount options used in the test were: mincache=direct and convosync=direct
See below graphs for a quick overview of the resulting throughput. For each bar the specific Sybase device settings are given (dsync / directio), as well as the Vertitas mount options. A higher bar means better throughput.
