Date: Fri, 27 Aug 1999 14:27:40 -0700 From: David Greenman <dg@root.com> To: Evren Yurtesen <yurtesen@ispro.net.tr> Cc: chas <panda@skinnyhippo.com>, freebsd-questions@FreeBSD.ORG Subject: Re: how can you tell when disk i/o is limiting performance ? Message-ID: <199908272127.OAA06510@implode.root.com> In-Reply-To: Your message of "Sat, 28 Aug 1999 00:15:28 %2B0300." <37C6FFEF.7E7E6F38@ispro.net.tr>
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>I believe that since tps and that kind of stuff is depending on the drive you >cant >say you are at the limits when your system shows 120 tps etc. There's really not a whole lot of difference in access times between various drives on the market. Typical is around 15ms +/- 5ms (remember that access time is average seek time + average rotational latency + transfer time), which results in a range of 50-100 TPS. This assumes totally random access, and there is usually some amount of locality, so a more typical range is 80-120 TPS for more or less 'random' access. -DG David Greenman Co-founder/Principal Architect, The FreeBSD Project - http://www.freebsd.org Creator of high-performance Internet servers - http://www.terasolutions.com Pave the road of life with opportunities. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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