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As such, in verify mode, the read sequence number >> may not match was we were expecting with multiple jobs running. > Is that a generic bug in fio? I wouldn't say so. That is just how the verify mode works. Fundamentally verify mode is to verify that we read back the contents of the file as expected after each iteration. If some other job comes along and overwrites that data, then that cannot be helped. However maybe I should just create a new verify mode for atomic writes, so it is clear what the verify operation constraints are. Thanks, John