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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!

Simon



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