From owner-freebsd-hackers Thu Jun 19 20:04:52 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id UAA05992 for hackers-outgoing; Thu, 19 Jun 1997 20:04:52 -0700 (PDT) Received: from pluto.plutotech.com (root@pluto100.plutotech.com [206.168.67.137]) by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id UAA05987; Thu, 19 Jun 1997 20:04:50 -0700 (PDT) Received: from narnia.plutotech.com (narnia.plutotech.com [206.168.67.130]) by pluto.plutotech.com (8.8.5/8.8.5) with ESMTP id VAA02058; Thu, 19 Jun 1997 21:04:29 -0600 (MDT) Message-Id: <199706200304.VAA02058@pluto.plutotech.com> X-Mailer: exmh version 2.0beta 12/23/96 To: Simon Shapiro cc: Brian Tao , FREEBSD-SCSI , FREEBSD-HACKERS Subject: Re: Announcement: New DPT RAID Controller Driver Available In-reply-to: Your message of "Thu, 19 Jun 1997 19:09:38 PDT." Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Thu, 19 Jun 1997 22:02:57 -0600 From: "Justin T. Gibbs" Sender: owner-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk >An excellent mechanical engineer designed a wonderful metal system (both >canisters and carriers). We had up to 30% perofrmance loss on random >seeks with system. It baffled anyone until another engineer decided to >test the drives on his desk, outside the box, outside the carriers - >Yes, the performance was back. Turns out soft errors were masked and >the rigid but ringing-resonating nature of steel and the high packing >density caused drives to resonate the cabinets and cause miseeks. Pluto's drive sled design uses a very simple and cheap suspension design to deal with this very problem. -- Justin T. Gibbs =========================================== FreeBSD: Turning PCs into workstations ===========================================