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About use restrictions

There are restrictions to using regular VxFS files as Quick I/O files.

• The name xxx::cdev:vxfs: is recognized as a special name by VxFS only when the following conditions are met:
  1. VxFS with Quick I/O has a valid license
  2. the regular file xxx is physically present on the VxFS file system
  3. there is no regular file named xxx::cdev:vxfs: on the system
• If the file xxx is being used for memory mapped I/O, it cannot be accessed as a Quick I/O file.
• An I/O fails if the file xxx has a logical hole and the I/O is done to that hole on xxx::cdev:vxfs:.
• The size of the file cannot be extended by writes through the Quick I/O interface.