How to flush the writing cache before a test with read

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Greetings,

FIO needs to write data files in order to read them. Without disabling
the write-cache of the disk, I was wondering if there's a way to flush
these data cache to disk right before FIO starts to read these files.

I don't want to run every second "sync && echo 3 >
/proc/sys/vm/drop_caches" at the same time with FIO because of its
incurred overheads. Please help.

Thanks,

Dan
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