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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