faq: correct fio examples for psync#21383
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- Use direct=1 instead of fdatasync=1 to avoid page cache interference - Set iodepth=1 since psync is synchronous (concurrency comes from numjobs) - Add time_based to ensure runtime=60 is honored
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First-time contributors' checklist
What is changed, added or deleted? (Required)
Use direct=1 instead of fdatasync=1 to avoid page cache interference
Set iodepth=1 since psync is synchronous (concurrency comes from numjobs)
Add time_based to ensure runtime=60 is honored
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