Generally speaking, it is best to preconditon with the block size you intend to test. There are some exceptions but they are device dependent and vary from one SSD to another. Depending upon your quality of service test (are you measuring steady state IOPs or latency or something else?), you may notice these differences in your 8k results. Regards, Jeff -----Original Message----- From: fio-owner@xxxxxxxxxxxxxxx [mailto:fio-owner@xxxxxxxxxxxxxxx] On Behalf Of Matthew Eaton Sent: Monday, May 22, 2017 3:32 PM To: fio@xxxxxxxxxxxxxxx Subject: SSD Test Recommendation 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! -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html ��.n��������+%������w��{.n�������^n�r������&��z�ޗ�zf���h���~����������_��+v���)ߣ�
