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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