Date: Thu, 3 Aug 2006 09:35:42 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Nikolas Britton <nikolas.britton@gmail.com> Cc: freebsd-questions <freebsd-questions@freebsd.org> Subject: Re: Fastest disk in the west or bad iozone numbers? Message-ID: <20060803143542.GA42319@dan.emsphone.com> In-Reply-To: <ef10de9a0608022327l7c344be4w4702999e237638fa@mail.gmail.com> References: <ef10de9a0608022327l7c344be4w4702999e237638fa@mail.gmail.com>
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In the last episode (Aug 03), Nikolas Britton said: > Anyone have a clue why iozone reports disk read rates of 688 > MegaBytes/s on a 1GB test file? Am I doing something stupid, like not > converting the numbers correctly? You want to test using a file at least twice as big as your RAM, otherwise you're just testing your cache. You can see an example of this on the first graph at http://www.iozone.org . Only the far right edge shows the disks speed. web.archive.org shows that same image existed back in 2000 with a modtime of 1999, so it's possible the machine being tested had under 256MB of RAM. -- Dan Nelson dnelson@allantgroup.com
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