SSD Test Recommendation

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Hi guys,

I want to run a quality of service test on SSDs with bs=4k and bs=8k
but I need some help.
I'm wondering if it's okay to test both 4k then 8k like this:

purge
precondition with 128k write
run 4k read test
run 8k read test
precondition to steady state with 4k write
run 4k write test
run 8k write test

Will the 8k test results be invalid due to the 4k write history?

Thanks!
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