如何用XFS設置有保證的io？

Question

根據維基百科XFS能夠保證IO的速度。我如何在Linux下（更具體地說是Centos 5.5）進行設置？或者這隻適用於IRIX？

Answer 1

Quoting戴夫Chinner：

Linux doesn't support GRIO. It's an Irix only thing, and that 
    required special hardware support for bandwidth reservation, special 
    frame schedulers in the IO path, etc.