[119027] in North American Network Operators' Group
RE: HE.net, Fremont-2 outage?
daemon@ATHENA.MIT.EDU (Bryan King)
Wed Nov 4 17:57:34 2009
From: Bryan King <bking@inline.com>
To: Owen DeLong <owen@delong.com>, Raphael Carrier <raphael.carrier@gmail.com>
Date: Wed, 4 Nov 2009 16:56:32 -0600
In-Reply-To: <97E072B0-8E7B-4A40-A63C-E7D7926CCCA2@delong.com>
Cc: "nanog@nanog.org" <nanog@nanog.org>, Joe Greco <jgreco@ns.sol.net>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Sry for the top post...
As more facilities are built/retrofitted with an eye toward overall efficie=
ncy using CCHP, we will start seeing more facilities (like Syracuse U's new=
datacenter) use systems like the Capstone turbines for primary power/secur=
e power/CCHP. The main grid will become the backup. Not saying this approac=
h replaces the need for batteries or some other storage device such as a fl=
ywheel system..
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From: Owen DeLong [mailto:owen@delong.com]
Sent: Wednesday, November 04, 2009 4:18 PM
To: Raphael Carrier
Cc: nanog@nanog.org; Joe Greco
Subject: Re: HE.net, Fremont-2 outage?
On Nov 4, 2009, at 2:08 PM, Raphael Carrier wrote:
>> I know you have a rather higher faith in batteries than some of us,
>> but practical experience suggests that batteries are merely a mostly-
>> reliable technology.
>>
>
> Agreed batteries are unreliable, an alternative to battery based UPS
> are flywheel energy storage devices, they come either as an integrated
> solution with the diesel generator (i think cat offers such a package)
> or as a standalone UPS (see:
> www.pentadyne.com/uploads/18/File/Pentadyne-VSS-Brochure.pdf)
>
Apparently you do not remember 365 Main...
Batteries are reliable.
Flywheels are reliable.
Both require proper maintenance and proper procedures to handle
corner cases (like the multiple-outage corner-case that took out
365 main).
Both have their issues.
In my experience working at and with a variety of datacenters, I have
to day that I have had generally better luck with batteries than
flywheels,
but, the key difference that suggests flywheels could actually be better
technology is this:
About 50% of battery failures traced back to human factors.
100% of the flywheel failures I experienced were human factors related.
Owen
Speaking as an individual, not representing any affiliation.
