filesystem i/o testing

greetings, 

has anyone ever conducted any formal testing on filesystem i/o for performance? 
 was there a methodology that was followed and what tools did you use to 
measure the performance?  

i'd like to do some research to better understand all the different types of 
filesystems and i/o and how they affect a database's performance.  i know of 
some tools out there, such as iozone, but i'd like to understand the approach 
and methodology of formally conducing the test.  any help our guidance would be 
greatly apprectiaed.

thanks in advance,
haroon


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