Lew Wolfgang wrote:
On 1/27/21 1:42 PM, Carlos E. R. wrote:
experience with UPS may be limited, but back in the day I ran a
10-KVA UPS to power a group of Sun Microsystem servers. It was a
nice UPS with a ferroresonant transformer that conditioned power as
well as running the 10-KVA load for 30-minutes. In my experience,
we experienced more unplanned power outages caused by the UPS itself
than if we directly connected to the mains. After we retired the
Suns and switched to SuSE I once managed to keep the main server up
and running continuously for a bit more than 4-years, without the
UPS. Without a reboot! It was a busy server too, with a hardware
Do you remember how did the UPS fail? I'm curious.
The UPS never actually failed, except for a time or two when the
battery bank needed to be replaced.
Downstairs we have a couple of APC SmartUPS'es - they know very well
when the batteries are due :-) They will sound an alarm, send an email
and an SNMP alert and keep doing it until the battery "cartridge" is
replaced. Once you pull out a cartridge, the entire bank is disabled,
which reduces the runtime by 20%.
At home, I have a little 6kVA Eaton, it's a little more effort. To swap
the batteries, you have to take the front off and switch it into
bypass, for instance. With monitoring by NUT, I still get SNMP alerts
though - not sure if it actually will complain about batteries, but it
does complain if the runtime sinks below a certain threshhold.
Still, it is really off-topic.
Per Jessen, Zürich (3.0°C)
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