Date: Sat, 21 Jun 1997 19:29:30 +0200 (MET DST) From: Wilko Bulte <wilko@yedi.iaf.nl> To: nadav@cs.technion.ac.il (Nadav Eiron) Cc: gjennejohn@frt.dec.com, hackers@FreeBSD.ORG Subject: Re: Announcement: New DPT RAID Controller Driver Available Message-ID: <199706211729.TAA02164@yedi.iaf.nl> In-Reply-To: <Pine.GSO.3.95-heb-2.07.970621120743.10140C-100000@csd> from "Nadav Eiron" at Jun 21, 97 12:15:25 pm
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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. Wilko _ ____________________________________________________________________ | / o / / _ Bulte email: wilko@yedi.iaf.nl - Arnhem, The Netherlands |/|/ / / /( (_) Do, or do not. There is no 'try' - Yoda --------------------------------------------------------------------------
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