Date: Fri, 20 Jun 1997 01:39:04 -0700 (PDT) From: Simon Shapiro <Shimon@i-Connect.Net> To: "Justin T. Gibbs" <gibbs@plutotech.com> Cc: FREEBSD-HACKERS <FreeBSD-hackers@FreeBSD.ORG>, FREEBSD-SCSI <FreeBSD-SCSI@FreeBSD.ORG>, Brian Tao <taob@nbc.netcom.ca> Subject: Re: Announcement: New DPT RAID Controller Driver Available Message-ID: <XFMail.970620013904.Shimon@i-Connect.Net> In-Reply-To: <199706200304.VAA02058@pluto.plutotech.com>
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Hi "Justin T. Gibbs"; On 20-Jun-97 you wrote: > >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. Proof that this problem is not unique. There are several ways of dealing with it. Worse was hanging devices on... springs! Simonhome | help
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