From: Jens Axboe <jaxboe@fusionio.com>
To: John Cagle <jcagle@gmail.com>
Cc: Sebastian Kayser <sebastian@skayser.de>,
"fio@vger.kernel.org" <fio@vger.kernel.org>
Subject: Re: IOPS higher than expected on randwrite, direct=1 tests
Date: Wed, 10 Nov 2010 20:52:41 +0100 [thread overview]
Message-ID: <4CDAF809.6010709@fusionio.com> (raw)
In-Reply-To: <C0509DB7-7B7F-4CB5-B10D-905E7580ACD8@gmail.com>
On 2010-11-10 20:50, John Cagle wrote:
> If the disk is 2TB, then your 100GB test is only using 5% of it-- thus
> your observed IOPS will be a lot better than expected due to
> short-stroking. Right?
That is also true, but probably not that much. See my previous email,
rotational latency should dominate here.
--
Jens Axboe
next prev parent reply other threads:[~2010-11-10 19:52 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-09 18:28 IOPS higher than expected on randwrite, direct=1 tests Sebastian Kayser
2010-11-10 6:57 ` John Cagle
2010-11-10 8:22 ` Sebastian Kayser
2010-11-10 14:09 ` Jens Axboe
2010-11-10 17:18 ` Sebastian Kayser
2010-11-10 18:58 ` Sebastian Kayser
2010-11-10 19:50 ` John Cagle
2010-11-10 19:52 ` Sebastian Kayser
2010-11-10 20:04 ` Jens Axboe
2010-11-12 14:38 ` Sebastian Kayser
2010-11-12 17:59 ` Shawn Lewis
2010-11-10 19:52 ` Jens Axboe [this message]
2010-11-10 19:51 ` Jens Axboe
2010-11-10 20:35 ` Sebastian Kayser
2010-11-10 19:48 ` Jens Axboe
2010-11-10 21:32 ` Udi.S.Karni
2010-11-11 17:43 ` Sebastian Kayser
2010-11-11 16:22 ` Sebastian Kayser
2010-11-11 21:25 ` Shawn Lewis
2010-11-12 13:43 ` Sebastian Kayser
2010-11-12 18:00 ` Shawn Lewis
2010-11-13 20:02 ` Jens Axboe
2010-11-15 13:36 ` Jeff Moyer
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