X config damaged by power failure

[dwight at supercomputer.org]

On Wednesday 30 April 2008 01:00:32 pm Mikkel L. Ellertson wrote:
> Patrick O'Callaghan wrote:
> > I've had a UPS for at least the last 5 years (not the same one)
> > since power here is iffy even at the best of times. At the
> > moment I use an APC 1KVA unit. Unfortunately for reasons I can't
> > quite fathom my machine still doesn't survive power outages even
> > though the other stuff on the UPS (monitor, DSL modem, router,
> > printer) all do. I've checked the earth (ground) connection and
> > it looks OK, and the UPS light shows green, i.e. all OK. The UPS
> > is only a year old so it can't be the battery.
> >
> > poc
>
> It could be the time it take to switch between line power and
> battery. It tends to be more common with fully loaded power
> supplies. There is not enough reserve in the filter caps or
> something to carry over the loss of a cycle or two. A UPS that
> will also compensate for line voltage tends to have less of a
> problem with this because there isn't the abrupt changeover.
>
> Mikkel

I concur. Also, my experience with APC UPS's is that they generally 
didn't become real UPS's until their SMART model (and above) series, 
starting with the (older) 1400 and now the 1500 smart model series. 
The lesser ones just didn't have the proper electronics.

It's not clear to me which model you have. But generally price is a 
good indicator. I always avoid the cheap UPS's.

HTH.

   -dwight-