nanog mailing list archives
Re: HE.net, Fremont-2 outage?
From: Owen DeLong <owen () delong com>
Date: Wed, 4 Nov 2009 14:18:04 -0800
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 haveto 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.
Current thread:
- Re: HE.net, Fremont-2 outage?, (continued)
- Re: HE.net, Fremont-2 outage? Matthew Petach (Nov 04)
- Re: HE.net, Fremont-2 outage? Joe Greco (Nov 04)
- Re: HE.net, Fremont-2 outage? Seth Mattinen (Nov 04)
- Re: HE.net, Fremont-2 outage? Joe Greco (Nov 04)
- RE: HE.net, Fremont-2 outage? Alex Rubenstein (Nov 04)
- Re: HE.net, Fremont-2 outage? Joe Greco (Nov 04)
- Re: HE.net, Fremont-2 outage? Raphael Carrier (Nov 04)
- Re: HE.net, Fremont-2 outage? Scott Howard (Nov 04)
- Re: HE.net, Fremont-2 outage? Joe Greco (Nov 04)
- Re: HE.net, Fremont-2 outage? Scott Howard (Nov 04)
- Re: HE.net, Fremont-2 outage? Owen DeLong (Nov 04)
- RE: HE.net, Fremont-2 outage? Bryan King (Nov 04)
- Re: HE.net, Fremont-2 outage? Robert Mathews (OSIA) (Nov 04)
- Re: HE.net, Fremont-2 outage? Joe Greco (Nov 05)
- Human Factors and Accident reduction/mitigation Owen DeLong (Nov 05)
- Re: Human Factors and Accident reduction/mitigation Robert Boyle (Nov 05)
- Re: Human Factors and Accident reduction/mitigation Michael Peddemors (Nov 05)
- Re: Human Factors and Accident reduction/mitigation Owen DeLong (Nov 05)
- Re: Human Factors and Accident reduction/mitigation JC Dill (Nov 06)
- Re: Human Factors and Accident reduction/mitigation Owen DeLong (Nov 07)
- Re: Human Factors and Accident reduction/mitigation JC Dill (Nov 07)