Linux tool to check random I/O performance

[mcclnx mcc <mcclnx@xxxxxxxxxxxx>]

we just purchase new I/O card and like to check I/O performance.

for sequence I/O performance test we can use "hdparm -t /dev/xxx"

bur for random I/O performance test which Linux command I can use?

** our environment does NOT allow install third party software..

Thanks

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