Stoopid power fail question.
Benjamin Scott
dragonhawk at iname.com
Mon Jul 25 21:22:01 EDT 2005
Building on Mark Komarinski's answer...
On Jul 25 at 3:33pm, Steven W. Orr wrote:
> 2. Do I want this to happen or is this considered risky?
It's generally considered okay. The risk is that if power comes on but then
fails again soon after, the battery will not have sufficient charge to
maintain the load through an orderly shutdown. How bad that is depends
largely on your software and your workload. It's also remotely possible then
"flickering" power could aggravate your hardware if the UPS has absolutely no
juice left but powers on the load with the input.
Many "smart" UPSes can be told to require a certain battery charge to be
reached before returning power to the load. Coupled with a communications
cable and shutdown software, this allows your system to shutdown gracefully on
low battery, and then resume operation only when it's safe to do so.
--
Ben <dragonhawk at iname.com>
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