[103290] in North American Network Operators' Group
RE: rack power question
daemon@ATHENA.MIT.EDU (John Lee)
Tue Mar 25 10:01:17 2008
Date: Tue, 25 Mar 2008 08:46:11 -0500
From: "John Lee" <John@internetassociatesllc.com>
To: "Paul Vixie" <vixie@isc.org>, <nanog@merit.edu>
Errors-To: owner-nanog@merit.edu
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Paul,
=20
Using a multi-stage filter system with the large partical filters in =
front and an ionizing stage to remove smaller but still large enough =
particals to cause dust. Clean room filters would be an overkill.
=20
John (ISDN) Lee
________________________________
From: owner-nanog@merit.edu on behalf of Paul Vixie
Sent: Tue 3/25/2008 2:17 AM
To: nanog@merit.edu
Subject: Re: rack power question
this has been, to me, one of the most fascinating nanog threads in =
years.
at the moment my own datacenter problem is filtration. isc lives in a =
place
where outside air is quite cool enough for server inlet seven or more =
months
out of the year. we've also got quite high ceilings. a 2HP roof fan =
will
move 10000 cubic feet per minute. we've got enough make-up air for =
that.
but, the filters on the make-up air have to be cleaned several times a =
week,
and at the moment that's a manual operation.
mechanical systems, by comparison, only push 20% make-up air, and the =
filters
seem to last a month or more between maintainance events. i'm stuck =
with the
same question that vexes the U S Army when they send the M1A1 into =
sandstorms,
or that caused a lot of shutdowns in NYC in the days after 9/11: what =
kind of
automation can i deploy that will precipitate the particulates so that =
air
can move (for cooling) and so that air won't bring grit (which is =
conductive)?
--
Paul Vixie
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<HTML dir=3Dltr><HEAD><TITLE>Re: rack power question</TITLE>=0A=
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<DIV id=3DidOWAReplyText93141 dir=3Dltr>=0A=
<DIV dir=3Dltr><FONT face=3DArial color=3D#000000 =
size=3D2>Paul,</FONT></DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2></FONT> </DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2>Using a multi-stage filter =
system with the large partical filters in front and an ionizing stage to =
remove smaller but still large enough particals to cause dust. Clean =
room filters would be an overkill.</FONT></DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2></FONT> </DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2>John (ISDN) =
Lee</FONT></DIV></DIV>=0A=
<DIV dir=3Dltr><BR>=0A=
<HR tabIndex=3D-1>=0A=
<FONT face=3DTahoma size=3D2><B>From:</B> owner-nanog@merit.edu on =
behalf of Paul Vixie<BR><B>Sent:</B> Tue 3/25/2008 2:17 AM<BR><B>To:</B> =
nanog@merit.edu<BR><B>Subject:</B> Re: rack power =
question<BR></FONT><BR></DIV>=0A=
<DIV><BR>=0A=
<P><FONT size=3D2>this has been, to me, one of the most fascinating =
nanog threads in years.<BR><BR>at the moment my own datacenter problem =
is filtration. isc lives in a place<BR>where outside air is quite =
cool enough for server inlet seven or more months<BR>out of the =
year. we've also got quite high ceilings. a 2HP roof fan =
will<BR>move 10000 cubic feet per minute. we've got enough make-up =
air for that.<BR>but, the filters on the make-up air have to be cleaned =
several times a week,<BR>and at the moment that's a manual =
operation.<BR><BR>mechanical systems, by comparison, only push 20% =
make-up air, and the filters<BR>seem to last a month or more between =
maintainance events. i'm stuck with the<BR>same question that =
vexes the U S Army when they send the M1A1 into sandstorms,<BR>or that =
caused a lot of shutdowns in NYC in the days after 9/11: what kind =
of<BR>automation can i deploy that will precipitate the particulates so =
that air<BR>can move (for cooling) and so that air won't bring grit =
(which is conductive)?<BR>--<BR>Paul =
Vixie<BR></FONT></P></DIV></BODY></HTML>
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