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From: mccarthy@uxe.cso.uiuc.edu
Newsgroups: comp.misc
Subject: Re: Cooling Big Iron (was Re: IBM mainf
Message-ID: <48800005@uxe.cso.uiuc.edu>
Date: Wed, 7-Oct-87 08:40:00 EDT
Article-I.D.: uxe.48800005
Posted: Wed Oct  7 08:40:00 1987
Date-Received: Sat, 10-Oct-87 18:42:27 EDT
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Nf-From: uxe.cso.uiuc.edu!mccarthy    Oct  7 07:40:00 1987


Written  1:29 pm  Oct  4, 1987 by alan@mn-at1.UUCP (Alan Klietz)
>Technically, the CRAY-2 is immersed in a bath of Fluroinert(tm), 
....
>It's damn expensive (~$100/gal).  Several gallons evaporate away every
>time the machine opened for repair (due to its low vapor pressure).

Don't they drain the stuff into some reservoirs before they open the
Cray up?  All the pictures I've seen of Cray-2's have either a bunch of
clear plastic cylinders or a clear-and-black thing about the size of a
jukebox behind it, that I thought were for Fluroinert(tm) storage when
the inside of the Cray-2 needed getting into.  It seems like if you lost
several hundred dollars each time you open it, you could rack up a rather
big loss in a hurry, especially if you open it as often as we open the
X-MP we have here. (at least 3x/week for preventative maintenence.)

BTW, we're getting a Cray-2 soon, so maybe I can find out for myself.
_____
D. J. McCarthy