From owner-freebsd-questions Fri Aug 27 14:29:39 1999 Delivered-To: freebsd-questions@freebsd.org Received: from implode.root.com (root.com [209.102.106.178]) by hub.freebsd.org (Postfix) with ESMTP id 1308215560 for ; Fri, 27 Aug 1999 14:29:35 -0700 (PDT) (envelope-from dg@implode.root.com) Received: from implode.root.com (localhost [127.0.0.1]) by implode.root.com (8.8.8/8.8.5) with ESMTP id OAA06510; Fri, 27 Aug 1999 14:27:40 -0700 (PDT) Message-Id: <199908272127.OAA06510@implode.root.com> To: Evren Yurtesen Cc: chas , freebsd-questions@FreeBSD.ORG Subject: Re: how can you tell when disk i/o is limiting performance ? In-reply-to: Your message of "Sat, 28 Aug 1999 00:15:28 +0300." <37C6FFEF.7E7E6F38@ispro.net.tr> From: David Greenman Reply-To: dg@root.com Date: Fri, 27 Aug 1999 14:27:40 -0700 Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG >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