Date: Thu, 19 Jun 1997 22:02:57 -0600 From: "Justin T. Gibbs" <gibbs@plutotech.com> To: Simon Shapiro <Shimon@i-Connect.Net> Cc: Brian Tao <taob@nbc.netcom.ca>, FREEBSD-SCSI <FreeBSD-SCSI@FreeBSD.ORG>, FREEBSD-HACKERS <FreeBSD-hackers@FreeBSD.ORG> Subject: Re: Announcement: New DPT RAID Controller Driver Available Message-ID: <199706200304.VAA02058@pluto.plutotech.com> In-Reply-To: Your message of "Thu, 19 Jun 1997 19:09:38 PDT." <XFMail.970619190938.Shimon@i-Connect.Net>
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>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 ===========================================
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