The best way to make regular files accessible to the Quick I/O interface and preallocate space for them is to use the qiomkfile command. Unlike the VxFS setext command, which requires superuser privileges, only a root user can run qiomkfile to create the files. The qiomkfile command has five options:
You can specify file size in terms of bytes (the default), or in kilobytes, megabytes, gigabytes, or sectors (512 bytes) by adding a k, K, m, M, g, G, s, or S suffix. If the size of the file including the header is not a multiple of the file system block size, it is rounded to a multiple of the file system block size before preallocation.
The qiomkfile command creates two files: a regular file with preallocated, contiguous space; and a symbolic link pointing to the Quick I/O name extension.