Need recommendation for tuning centos 6.4 for high iop's on virual machines and physical machines

Hi All,

I need your recommendation for tuning my virtual machines and physical machines for high IOps and network xerfs with centos 6.4.... please advice what all diffrent kernel parameter i could tune or modify or any other suggestion?
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Systems can sustain nearly unlimited IOPs while normal disks are 1000 times slower.
300MBps SATA does 300000KB/s which is about 75000 IOPs in 4k blocks
You are lucky if SSD disk gives half of that
Mechanical drives allow one write per revolution, so count sorry IOPs from rpms.

What is a xerf?

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IO tuning will be very usage-dependant. you may wish to post details. if there was a generic way to tune kernels to achieve higher IO, it would be set as the default.
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