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If the Quick I/O feature is licensed and installed, Quick I/O is enabled by default when a file system is mounted. The -o qio and -o noqio mount options enable and disable, respectively, Quick I/O when a file system is mounted.
If Quick I/O is not installed or licensed, a file system mounts by default without Quick I/O and no error message is displayed. However, if you specify the -o qio option, the mount command terminates without mounting the file system.
To enable or disable Quick I/O