Veritas File System 5.0 Administrator's Guide (September 2006)
File placement policies and extending files ...................................... 182
Chapter 11 Quick I/O for Databases
About Quick I/O ......................................................................... 183
About Quick I/O functionality and performance ............................... 184
About asynchronous I/O kernel support .................................... 184
About direct I/O support ........................................................ 184
About Kernel write locks avoidance .......................................... 184
About double buffering avoidance ............................................ 185
About using Veritas File System files as raw character devices ............. 185
About the Quick I/O naming convention ................................... 185
About use restrictions ........................................................... 186
About creating a Quick I/O file using qiomkfile ................................ 186
Creating a Quick I/O file using qiomkfile ................................... 187
Accessing regular VxFS files through symbolic links ......................... 188
About absolute and relative path names .................................... 188
Preallocating files using the setext command ............................. 189
Using Quick I/O with Oracle databases ........................................... 190
Using Quick I/O with Sybase databases ........................................... 190
Enabling and disabling Quick I/O ................................................... 191
Cached Quick I/O for databases ..................................................... 192
Enabling Cached Quick I/O ..................................................... 192
Tuning Cached Quick I/O ....................................................... 194
About Quick I/O statistics ............................................................ 195
Increasing database performance using Quick I/O ............................. 195
Appendix A Quick Reference
Command summary .................................................................... 197
Online manual pages ................................................................... 200
Creating a VxFS file system .......................................................... 206
Example of creating a file system ............................................. 207
Converting a file system to VxFS .................................................... 208
Example of converting a file system ......................................... 208
Mounting a file system ................................................................ 208
Mount options ..................................................................... 209
Example of mounting a file system ........................................... 210
Editing the fstab file .............................................................. 210
Unmounting a file system ............................................................ 211
Example of unmounting a file system ....................................... 212
Displaying information on mounted file systems .............................. 212
Example of displaying information on mounted file systems ......... 212
Identifying file system types ......................................................... 213
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