Questions tagged [ups]
uninterruptible power supply
272
questions
99
votes
2
answers
27k
views
Smell of rotten eggs in the server room
A week ago I got the following error on my APC Smart-UPS 1000 which I muted.
Warning State:
Connect battery
Load: 55%
Batt: 100%
Today, I could smell a sort of sulfur/sulphur/rotten egg smell when I ...
- 1,273
56
votes
14
answers
2k
views
Is UPS worthwhile for non-production equipment? [closed]
Over the years, I've had to throw away a quite a few bits of computing equipment (and the like):
Several ADSL routers with odd symptoms (losing wireless connections, losing wired connections, DHCP ...
- 4,987
51
votes
6
answers
17k
views
What are the pros and cons of having your own UPS attached to your own server hosted in a data center?
According to this comment by Tom O'Connor (slightly edited below):
You can seriously cheese off a datacentre by putting an UPS inside your own rack.
What are the risks to the data center should a ...
- 1,424
34
votes
9
answers
26k
views
UPS and power strip interactions?
Sometimes I hear that you shouldn't plug (UPS brand X / any UPS) into (power strip brand X / any power strip) because of some interaction leading to poorly conditioned power, reduced battery life, ...
- 7,493
19
votes
10
answers
19k
views
Testing a UPS by unplugging it from the wall
At an Not For Profit/Charity I volunteer for occasionally we were very fortunate to be provided (donated) with a brand new 3Kva APC UPS. This is total overkill for our modest server rack (four mid-...
- 69.1k
19
votes
4
answers
4k
views
Plugging in a server rack with UPSes into a room that has its own UPS backup issues
Thank you everyone who's responded. There's been a common theme in some of the responses that I wanted to clarify since I wasn't clear in my original post. This is an upgrade that will replace their ...
- 190
19
votes
4
answers
21k
views
Replace a UPS battery or buy a new UPS?
Is it worth buying a replacement battery for a UPS or better to buy a completely new UPS? I have heard a UPS is never the same after the original battery dies and is replaced.
Is it OK to use a ...
- 301
18
votes
3
answers
12k
views
How does a 3-Phase UPS distribute power?
We've got 2 UPSes in our server room. One's 3 phase, and has a 3phase supply, yet the APC network stats thing only says
Incoming Voltage: 230.1 Volts
The other is a single phase one with no ...
- 27.6k
17
votes
6
answers
5k
views
Is it safe to use a UPS designed for desktop PCs to power a server?
I am working on a server within my office. The server will eventually be relocated to a data center. I would like to be able to leave the server switched on in my office, which means I would like to ...
- 773
17
votes
4
answers
61k
views
Change the UPS battery while it's powered on?
Is it dangerous or not advisable to change the UPS battery while it is plugged in? We have an APC Smart-UPS 1500 and we need to replace its battery. I have the new battery but the UPS powers a few ...
- 597
17
votes
14
answers
60k
views
What is the lifespan of an typical UPS battery?
When using a uninterruptible power supply how long does it preserve the original capacity? Say I buy a UPS that holds the necessary load for 10 minutes - I don't want it to unexpectedly come into ...
- 2,739
17
votes
4
answers
3k
views
Can Running a Server's Redundant PSU on Different Circuits Damage It?
So I've been tasked to document and review the status of the UPSes for my current employer and identify any changes that need to be made. Generally easy stuff, however I came across a few units that ...
- 507
17
votes
6
answers
22k
views
How to wake a server after UPS Shuts it down when Mains power is restored?
I have several Linux servers connected to APC UPSs. They are connected to the UPS via USB and configured to shutdown if the UPS sends a signal that mains power has been lost and has not returned after ...
- 768
16
votes
3
answers
24k
views
What is the difference between a PDU and a power strip (both 120V, 15A)?
I just chatted with an APC rep about upgrading the UPSes at our office. She recommended a single higher-capacity 6-outlet Smart-UPS to replace the four Back-UPS units we currently have. When I asked ...
- 1,273
15
votes
7
answers
27k
views
Can I plug a 15A UPS into a 30A receptacle?
I know that typically electronics draw only as much current as they need. Is this the case with UPSs? I have a 120 volt, 30 amp circuit, and am replacing the UPS plugged into that circuit with a lower ...
- 329
15
votes
5
answers
3k
views
Is there any value in protecting both rack power feeds with their own UPS?
I've done some looking and have not found a satisfactory answer to this question.
When is it necessary or suggested to use an independent UPS (on it's own mains branch circuit) for each power feed to ...
- 328
14
votes
4
answers
49k
views
Why do I need a raid battery pack?
I'm trying to understand why one would add a batterypack to a raid card. It seems to me like if power goes down, running just the raid card is going to do little good: without power for HDs and ...
user60704
13
votes
1
answer
619
views
Sysadmin in the Developing World: What are the differences between various kinds of power protection?
Hello I'm an ICT (InfoComTech) US Peace Corps volunteer deep in Tanzania who has the task of managing and advising concerning our college's two SunFire Sun Ray Servers and Dell Proxy server (on 2 ...
- 275
12
votes
4
answers
4k
views
How to configure UPS to restart servers in the right sequence?
Here we have some servers and almost each of them has a dedicated UPS. There are dependencies between them so they must be switched on in the correct sequence. Ultimately we are experiencing serious ...
- 373
12
votes
1
answer
281
views
datacenter UPS electronics/chassis expected lifetime
We have a small datacenter with seven APC 5000VA rackmount UPS. These have had regular battery replacement, but have just passed 10 years of service. We also have a boxed spare unit of the same model ...
- 3,792
11
votes
3
answers
4k
views
New UPS Batteries Dying in Months
This is something that has had me stumped for over a year. I have 3 APC SmartUPS 3000's and a few non APC units in my server room. Each unit has it's own dedicated connection to the breaker panel.
...
- 468
11
votes
1
answer
867
views
Daisy Chaining UPS Power Cable
I have a rackmount UPS. The UPS has a 6ft long 12AWG thick power cable that powers it from one of the server room's 20A wall plugs.
The current orientation of the cabinets is not ideal. All but this ...
- 580
10
votes
4
answers
14k
views
Does UPS Rack Position Matter
Short version of question:
Is there any reason a UPS (or any other device) should be at a particular level in a rack.
Long version (with explanation):
I have a full height rack with two servers, ...
- 289
10
votes
4
answers
29k
views
What purpose does the battery serve on a battery-backed caching RAID controller if the server is on an uninterruptible power supply?
Is the battery redundant if the server is on a properly-sized UPS? There is an option to force write-back mode and I want to understand the risk. It is my understanding that it helps against power ...
- 101
10
votes
2
answers
6k
views
One server, Two APC UPS on redundant power supplies : How to trigger shutdown?
I have a server racked and its redundant power supplies plugged in two APC Smart-UPS 3000 XLM. Each UPS is connected to two different mains power sources.
Two instances of apcupsd are running, each ...
- 1,742
10
votes
2
answers
10k
views
How can I calculate if a UPS is sufficient for my requirements?
I am not that of an electricity knowledgable person, so I'll try to put as much info as possible.
I have a Rack Mount UPS of 1800 Watts Model: PRP 3050 RM (in total I have 2 of these - talking about ...
- 1,801
9
votes
5
answers
10k
views
UPS - Two computers - How to get them to both shutdown when battery is low?
Short Version: How do I get 2 computers to shutdown when a UPS battery gets low?
Long Version:
I have an APC UPS, the RS 1500. It has a USB cord that goes into my main dev computer. My dev computer ...
- 1,133
9
votes
4
answers
2k
views
UPS Requirements - Max load or actual load?
One of our UPS units failed this weekend (Happy new year!), and so I'm on the look out to replace it.
I've done the calculations for our power requirements, and it comes out just under 8000W. This is ...
- 93
8
votes
7
answers
593
views
What less obvious ways are there to misuse and damage a UPS?
I've never had an uninterruptible power supply and think of buying one. What not-so-obvious things should I not do to the UPS so that it lives longer?
I don't mean some obvious abuse like dropping/...
- 2,739
8
votes
3
answers
20k
views
Automatic power on after graceful shutdown on UPS
This is my basic setup:
I run a server (DL380 G7; linux 3.13 kernel) that is host to ~10 virtual machines
It is set for automatic power on
I use NUT for UPS management
Graceful shutdown duration of ...
- 83
7
votes
8
answers
4k
views
Is there a solution against short power outages except UPS?
I encounter very short power outages quite often. Typically they last for just couple of seconds - perhaps the power grid maintenance staff just flips the switch to "Off" and then immediately to "On". ...
- 2,739
7
votes
2
answers
21k
views
FTP: How to get rid of "WARNING! 1 bare linefeeds received in ASCII mode" message?
I wrote a little shell script (on CentOS) to download statistics from our APC UPS device. It works great, but everyday cron sends an email with this message:
WARNING! 1 bare linefeeds received in ...
- 71
7
votes
6
answers
3k
views
Server power supply failures?
I have 6 servers both with 2 power supplies attached to an UPS. I want to add 4 more servers but the UPS is full and due to budget restriction I couldn't buy a new one for months. The 6 + 4 new ...
- 1,444
7
votes
3
answers
12k
views
UPS power requirements for server
Greetings!
So, I just placed an order for a new server. The company recommended that I get a 3000W UPS. (!) As best as I could I calculated the following wattage consumption based on benchmarked data ...
- 111
6
votes
7
answers
10k
views
Is Tripp Lite a trusted brand for a UPS? [closed]
I am looking to buy a rack mounted UPS that can take in 208V power and serve up 120V power. A basic APC unit that can do this is $4k. I have found a Tripp Lite model that will work for $2.5k.
Is the ...
- 79
6
votes
6
answers
8k
views
Redundant Power Supplies and UPS (Dell Servers)
I have a number of Dell 2950 servers with two power supplies. In normal usage how are the PSU's utilised?
Do they both draw '50%', only switching to 100% if one of them dies? Does one supply provide ...
- 4,112
6
votes
5
answers
418
views
Do aging UPSes need to be replaced?
I've got a 2200VA UPS with AVR and power conditioning that's over 10 years old.
Does a UPS lose its ability to protect equipment over time? I'm not asking about batteries, but the UPS hardware ...
- 5,008
6
votes
5
answers
11k
views
APC Smart-UPS: remote power shutoff?
Given:
A server room containing about two dozen rackmount servers and a PBX.
About a dozen APC Smart-UPS 2200s providing power to this equipment.
A fire suppression project requiring immediate ...
- 14.2k
6
votes
1
answer
2k
views
Calculate UPS Power
Does anyone know how to calculate UPS Power assuming I have server with 650 of watt.
- 295
6
votes
4
answers
8k
views
ZFS - enable or disable disk cache?
I'm setting up ZFS (through FreeNAS) with RAIDZ1 on a server with 4 x WD Red SATA HDDs (connected through a PERC H330 in HBA mode).
The server is hooked to a UPS.
For ZFS and in this setup, does it ...
6
votes
2
answers
6k
views
How can I fix my UPS repeatedly disconnecting and reconnecting?
I'm running a nut server connected to a Tripp Lite SMART1500LCD by USB. The device is behaving unexpectedly and I can see these kernel messages:
user@host:~ $ dmesg -T
[Wed Dec 4 13:24:24 2019] usb ...
- 101
6
votes
2
answers
40k
views
How to perform a APC 9617 Reset?
I've locked myself out of an APC 9617 management card. Trying to figure out how to reset the password, or even the card to factory defaults. All the documentation I can find says to connect to the ...
- 443
5
votes
3
answers
1k
views
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 ...
- 194
5
votes
2
answers
782
views
Cancel / block a task triggered with delay by windows "task scheduler"
This is related to a specific issue, but I think it is an "interesting" question for general use: In Windows (specifically 2k8 server, for me) you have a task that is triggered by an event (...
- 164
5
votes
1
answer
9k
views
APC UPS replace battery light and apcupsd reporting "replace battery"
We have an APC Smart UPS 1500. The "Replace Battery" light is on, and apcupsd reports:
Emergency! Batteries have failed on UPS xxxx. Change them NOW
However, from this article,
http://sturgeon....
- 904
5
votes
3
answers
743
views
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 ...
- 84.4k
5
votes
2
answers
1k
views
UPS for 30A service to server racks
Our server rack has two 208V 30A dedicated circuits running to it, each to a PDU mounted in the rack. Most of the equipment has redundant power supplies so one goes to each PDU. I'm not sure who had ...
- 563
5
votes
2
answers
10k
views
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 ...
- 1,493
4
votes
6
answers
15k
views
UPS with a HP Proliant server
We placed a EATON Ellipse Max 1500 (900W) as the UPS for our HP Proliant ML350 G6. Upon first power failure (actually we only moved the UPS' input plug to a different socket), server immediatelly ...
- 1,297
4
votes
4
answers
3k
views
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 ...
- 198k