Panic when doing shutdown or reboot

Reindl Harald h.reindl at
Wed Mar 6 21:04:10 UTC 2013

Am 06.03.2013 21:56, schrieb Joe Zeff:
> On 03/06/2013 12:42 PM, William Perkins wrote:
>> This is a problem because the system that controls the UPS must poweroff
>> to shutdown the UPS during a power failure.  If it does not, the UPS
>> powers off after the batteries run down.  This is not good for the UPS.
> I take it, then, that the UPS is only intended to allow for an orderly shutdown.  How do you handle short power
> drops?  (Please understand that I've never worked professionally with this type of thing but I'm always interested
> in learning new thing.)

short power drops are not the topic

the problem is to runa UPS battery completly empty
deep uncharge is very bad for most batteries

besides the problem that i have seen UPSes after power comes
back starting and get completly discharged while the machine
booted because before the power managment of the OS take scontrol
you have 150W on a typical SyndyBrdige machine while after boot
in idle state it takes only 45-55W

this may end in a loop where the battery gets deep uncharged
many times and possibly damaged as also the filesystems are
not thankful for repeated hard power off due FS check at boot

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