HE.net, Fremont-2 outage?

Regardless of generator sizing issues or disparities, if the ATS fails,
then no amount of grid or generator power will keep the cabinets juiced up.

Sure. Having no direct knowledge of the HE DC in question, I was merely
commenting on the issue I replied to.

Since this is the second time in recent history that this building has
experienced a short power outage caused by ATS flakiness,

Has this been verified?

keeping a small UPS in the cabinet isn't such a bad idea? Even if the
distribution switches/routers lose power, at least the servers wouldn't
have to go through fscks and DB integrity checks due to unplanned power
loss, and the recovery time would be significantly faster.

Small UPS's have their own set of ugly failure modes. For example, we
find that the APC Smart-UPS 1400's have a tendency to cook their
batteries; if you don't have monitoring of some sort, you may not find
out that your batteries are cooked until the UPS decides it is hopeless
and shuts itself off. In the meantime, the lingering sulfur smell may
panic someone... or cause a falsing of the fire system...

Colos frequently forbid the use of small UPS's for a variety of reasons.

Hell, for a 5 minute power outage, some of my services were down for 20
minutes. I'll happily take a 75% reduction in downtime for the cost of a UPS
, though clearly redundancy across more reliable datacenters is a better

So is redundancy across power systems within the colo, but only for well-
designed colos. Stories omitted.

... JG

Colos frequently forbid the use of small UPS's for a variety of reasons.

In my experience they always need to be connected to the EPO switch, which poses it's own risks. Plus try to find a UPS with that feature for reasonable prices.

Which leads me to this question: What questions do you ask any potential colocation provider to determine if they are built out to your needs?