Date: Sat, 21 Jun 1997 17:07:34 -0700 (PDT) From: Simon Shapiro <Shimon@i-Connect.Net> To: Wilko Bulte <wilko@yedi.iaf.nl> Cc: hackers@FreeBSD.ORG, gjennejohn@frt.dec.com, (Nadav Eiron) <nadav@cs.technion.ac.il> Subject: Re: Announcement: New DPT RAID Controller Driver Available Message-ID: <XFMail.970621170734.Shimon@i-Connect.Net> In-Reply-To: <199706211729.TAA02164@yedi.iaf.nl>
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Hi Wilko Bulte; On 21-Jun-97 you wrote: > As Nadav Eiron wrote... > > On Fri, 20 Jun 1997 garyj@frt.dec.com wrote: > > > > jkh@time.cdrom.com writes: > > > > providing forced airflow past the drives, then I suppose the > plastic > > > > sled construction wouldn't really matter much, would it? :-) > > > My previous employer had a pretty big OpenVMS cluster with giant SW800 > > racks (rough estimate - about 500 drives, total most 7200rpm). When > > filling up one of these racks, DEC recommends that you add a shelf of > fans > > Right, the 'fan tray' as it is called. > > > at the bottom to force some more air into it, but other than that, heat > > doesn't seem to be a problem. These plastic canisters seem to have > great > > air flow. Just place your hand over the warm air outlet of one of these > > SW800s and feel how much heat it evacuates from the drives. > > It's interesting to note that when the 7200 rpm drives were introduced > also new fan models were introduced to be put on the back of the storage > shelves. The idea is that one fan is allowed to fail without causing a > disk meltdown. The older fans could not keep up in such a case > so the newer dual speed fans are needed. In case a fan fails, the > remaining fan switches to double speed. Like I said, these hobyists at DEC really do not know the first thing about disk subsystems. Give me a good PC. Grrrrr... :-) Any idea about my network-scsi interaction? Simon
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