Server Fault Stack Exchange
Server Fault Stack Exchange

Questions tagged [ups]

uninterruptible power supply

An uninterruptible power supply, also uninterruptible power source, UPS or battery/flywheel backup, is an electrical apparatus that provides emergency power to a load when the input power source, typically mains power, fails. A UPS differs from an auxiliary or emergency power system or standby generator in that it will provide instantaneous or near-instantaneous protection from input power interruptions by means of one or more attached batteries and associated electronic circuitry for low power users, and or by means of diesel generators and flywheels for high power users. The on-battery runtime of most uninterruptible power sources is relatively short—5–15 minutes being typical for smaller units—but sufficient to allow time to bring an auxiliary power source on line, or to properly shut down the protected equipment.

enter image description here

Source: wikipedia

271 questions
5
votes
2 answers

How to properly shutdown ESXi cluster after power outage?

I am integrating UPS EATON with our ESXi 4.1 cluster. Eaton provides shutdown script for one particular ESXi host (shutdownESXi.pl) The problem was, after manual execution of shutdownESXi.pl script on vMA with shutdownESXi.pl --server ServerName…
John
  • 1,493
  • 3
  • 26
  • 46
5
votes
3 answers

Does a Redundant Power Splitter Exist?

We have two UPS units in our data center. All of our servers and network equipment have dual redundant supplies, one plugged into each UPS. We recently had a failure of one UPS. The servers and network hardware were not affected because they were…
obsidian
  • 194
  • 1
  • 8
5
votes
3 answers

Considerations when buying a UPS Replacement Battery

According to a couple of my Smart UPS 3000s (Model DLA3000RM2U), it is time to replace the battery. Other than making sure I get the right battery for the particular model, are there any other things I should think about when buying the replacement…
Kyle Brandt
  • 83,619
  • 74
  • 305
  • 448
4
votes
4 answers

HP ProCurve 5412zl warm-boots on power failure while attached to UPS

My client's HP ProCurve 5412zl chassis switch reboots on occasion, despite being powered through four redundant power supplies and being under UPS protection. These reboots usually happen during a real power outage or during a brown-out or…
ewwhite
  • 197,159
  • 92
  • 443
  • 809
4
votes
2 answers

How do I condition power between a generator and a UPS?

How do I condition power between a generator that does not produce a clean sine wave and a UPS to such a standard that the UPS will accept the power? I have tried running through a power conditioner, but I believe the problem is that the power…
user2395126
  • 325
  • 1
  • 4
  • 11
4
votes
5 answers

UPS suitable for small-business network and server infrastructure

I've tried a number of UPS units for numerous small business installations, as well as my own home systems and have yet to find a reliable brand. Some units last for years, other units of the same make/model end up burning out in 2 months. Not…
patjbs
  • 258
  • 2
  • 6
4
votes
2 answers

How to have NUT automatically power off a UPS before the monitoring system shuts down?

I've got NUT configured on a few systems in the following way: One host is connected to four UPSes via USB. That host is plugged into two of the four UPSes. Two other hosts are on the same rack, each plugged into one of the remaining UPSes. …
asciiphil
  • 3,086
  • 3
  • 28
  • 53
4
votes
2 answers

Does the additional load on UPS in case of grid failure amount to 100%?

The scenario is as follows: Servers are equipped with two PSU's each. One of these is connected to the UPS, the other one directly to the power grid (bypassing the UPS). I would assume that since the PSU's are redundant, load is more or less evenly…
Roman
  • 3,907
  • 3
  • 21
  • 34
4
votes
3 answers

Out of band notification when UPS loses mains power?

We're currently looking into upgrading our UPS and possibly having a small petrol generator on site in the eventuality that the UPS battery is used long enough to drain it completely. Realistically, we can only afford a UPS that would give us…
dannymcc
  • 2,717
  • 10
  • 48
  • 72
4
votes
5 answers

apcupsd slave client keeps loosing and restoring communications with UPS master

On a VMWare ESXI 5.0.0 (vSphere Hypervisor - the free version) I have three server images. All running CentOS 6 - Linux. All are configured to run the apcupsd ( http://www.apcupsd.org/ ) daemon for controlling APC upses. One of the servers (master)…
Jbruntt
  • 43
  • 1
  • 5
4
votes
2 answers

How to detect APC UPS battery usage and run a script when on battery

I have a couple APC UPS - Smart-UPS RT 6000 RM XL Smart-UPS RT 5000 RM XL Unfortunately the power in my office likes to go out (out of my control) and hence the equipment powered by these UPS shuts down. They power a VMware infrastructure…
Andy Arismendi
  • 1,188
  • 5
  • 16
  • 27
4
votes
2 answers

Checking voltage expectation of HP G3 UPS

We have several HP G3 UPS's (most of them are HP R1500 G3). Some of our UPS's were constantly going into Buck mode. Turns out their dip switches on the back were never changed from default, which was to expect an input voltage of 220V, and our…
Mark Henderson
  • 68,823
  • 31
  • 180
  • 259
4
votes
2 answers

Does unbalanced load on three-phase UPS use more power and cost more?

We have a three-phase online data center UPS. Someone said recently that if the input amperage across the phases were 70-10-10 we'd pay for the kWh represented by 70 amps, but if the same load were spread out to 30-30-30, we'd pay for kWh…
Paul
  • 779
  • 1
  • 9
  • 18
4
votes
7 answers

UPS disposal

What do I need to do to get rid of my old UPS? The battery no longer works, and the unit is probably completely hosed at this point, as the equipment on it suffers from the occasional complete reboot. So, I won't give it to someone or donate it,…
mmr
  • 369
  • 2
  • 6
  • 18
4
votes
1 answer

How do I inform my ESXi 5 host(s) of a power outage?

My APC UPSs all have the APC SNMP card so they are able to communicate over the network. From what I've been able to find the PowerChute program alerts the guest OS that a power outage has occurred but not a VM host. I'd rather alert the host (or…
Chris76786777
  • 979
  • 5
  • 21
  • 35
1 2 3
…
18 19