25 Dec
2002
25 Dec
'02
5:45 p.m.
From: John Lawson <jpl15(a)panix.com>
To: Glen Goodwin <acme(a)ao.net>
Subject: Re: VAX 11/780 anyone with some working experience out there?
Date: 12/25/2002 4:47 PM
another, but no such luck... and I know plenty of
folks who spent long
years working in big machine rooms... 90+ dB all the time... no thanks.
Umm, 90+ dB? Can this be right?? That seems awfully loud. Is that typical for
larger machines?
Just one more thing to take into account before I seriously consider moving any
larger equipment in here . . .
Glen
0/0
25 Dec
25 Dec
6:49 p.m.
On Wed, 25 Dec 2002 acme(a)ao.net wrote:
Umm, 90+ dB? Can this be right?? That seems awfully
loud. Is that typical for
larger machines?
Direct measurement of my 11/44; 2 ESDI drives in an 11/23 chassis, 1
RL02: 79.1 dBC, @1 meter on-axis with front panel of CPU, quiet rural
house winter night ambient, B&K noise meter of known recent calibration.
Recorded spectra show strong peaks in the 300 - 600 Htz range, and quite a
bit of energy in the harmonics of the fan noise, going out to 8 - 10 kHtz.
In the early 80s, a friend was an analyst for Quotron Systems (stock
trading and broker systems). I was several times in their big machine
room, which at the time had a hugish 11/782, several /750s and a couple of
/34s in some kind of data concentrator... many RP0x-type removable pack
drives, about a dozen TU-whatever tape drives, and the rest of the usual
suspects. The printer farm lived in it's own area, apart from the machine
room. With the HVAC going, and all the fans and motors, it was necessary
to shout to be heard, and (speaking as an audio professional) it was *at
least* 90dB all the time, probably more, based on my experience with
elevated noise environments.
Just one more thing to take into account before I
seriously consider moving any
larger equipment in here . . .
Like I said, it bugs me to distraction with this thing roaring away 5
feet behind me, and it's a decided relief when I shut 'er down and Peace
rules once again... ;}
I *really do* want a "machine room" of some kind... even for my small
installation. My previous collection made even more noise, and *it* was
also in the damned room with me. Like I said: Someday......
Cheers
John
28 Dec
28 Dec
3:19 p.m.
On Wed, Dec 25, 2002 at 07:51:36PM -0500, John Lawson wrote:
Like I said, it bugs me to distraction with this thing roaring away 5
feet behind me, and it's a decided relief when I shut 'er down and Peace
rules once again... ;}
old hardware is certainly loud. my 11/70 can easily overpower the noise made
by the half a dozen sparcs, half a dozen ciscos and two alphas. that's no small
feat. ;0
I *really do* want a "machine room" of
some kind... even for my small
installation. My previous collection made even more noise, and *it* was
also in the damned room with me. Like I said: Someday......
i used to share a single room for office and datacenter. i will never ever do
that again. the noise and heat was pure insanity.
-brian
--
"Homer, this is the worst thing you've ever done."
"Oh Marge, you say that so often it's lost all meaning."
26 Dec
26 Dec
12:58 p.m.
On Wednesday, December 25, 2002, at 06:47 PM, acme(a)ao.net wrote:
Many machines, yes, but some designers have met with success using
large-diameter, slow-turning blowers as are found in machines like DEC
VAX6000s and AlphaServer 8400s. These blowers are very large, and
surprisingly quiet.
For more "traditional" cooling systems (dozens of screaming muffin
fans) it definitely pays to make whatever household modifications it
takes to support a large-machine lifestyle. ;) I hear a low rumble
coming from my machine room, which is mostly conducted through the
structure of the house and isn't really noticeable. I love my
machines, but it's nice to not need to work in there very often...can't
hear myself think!
-Dave
--
Dave McGuire "She's a cheek pincher. I have scars."
St. Petersburg, FL -Gary Nichols
another, but
no such luck... and I know plenty of folks who spent
long
years working in big machine rooms... 90+ dB all the time... no
thanks.
Umm, 90+ dB? Can this be right?? That seems awfully loud. Is that
typical for
larger machines?
8036
days inactive
8039
days old
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