My understanding is that the batteries are there to cater for
precisely this situation.

They (the cache batteries) aren't powered externally; they ensure the
cache guaranteed power and is therefore protected in the case of an
unexpected power loss.

That's why when the cache batteries fail, your performance is degraded
- the system doesn't use the cache as it is no longer guaranteed

On Thu, Jan 17, 2013 at 7:52 AM, Jeff Crosby <jlcrosby@xxxxxxxxxxxxxxxx> wrote:

Would the cache batteries have held properly from whenever the UPS
batteries went dead until 1pm?

When unstable utility power was restored at 1pm (9 hours), then some power
would have been coming from the UPS. Since nothing else on the UPS was
powered on, I assume whatever little power was available from the UPS would
have been enough to power the control panel/service processor/green light
on the front of the system and therefore would be supplying power to the
cache batteries.

Does what I just wrote make sense?

This thread ...


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