HE.net, Fremont-2 outage?
owen at delong.com
Wed Nov 4 16:18:04 CST 2009
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:
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
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
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.
Speaking as an individual, not representing any affiliation.
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