10
votes
1answer
338 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 ...
3
votes
2answers
205 views

UPS unable to power the 1U server

1U rack server: http://ark.intel.com/products/67786/Intel-Server-System-R1304GL4DS9 Power backup: http://www.apc.com/products/resource/include/techspec_index.cfm?base_sku=BR1000G-IN When I try ...
5
votes
2answers
104 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 ...
2
votes
2answers
70 views

Two APC Symmetra LX 16kVA into one common output?

We have 2x APC symmetra LX 16kVA units running at the moment and have read (in Eaton's documentation) that their UPSs can have a common synchronised output (based on input phase or set phase with a ...
2
votes
3answers
81 views

How should mains power be conditioned for devices not protected by a UPS?

UPSes protect devices from more that just power outages. I've got a Schneider SURTA2200XL UPSes (manual here). It protects against all of the following: undervoltage (aka brownouts) overvoltage ...
1
vote
2answers
124 views

Server 2008 R2 - Allow UPS to wake computer?

I have a single Windows Server 2008 R2 box that's on a generic Geek Squad battery backup. (That purchase was not my choice.) It shuts down fine when the battery hits a critical level, but I can't seem ...
1
vote
1answer
228 views

Backup Power System for a Small Office: UPS, ATS, Generator etc

I'm trying to put together a backup power system for our office and I need some guidance. We frequently lose power for several hours at a time. I'm looking for a solution which would: Control ...
2
votes
1answer
1k views

HP ProLiant ML350 G6 powerup issue

My setup: HP ProLiant ML350 G6 (2x PSU/redundant) I present my issue in a few steps: Power cables disconnected (no power coming to server) Re-connect cables Press "Power button" -> I can see green ...
4
votes
2answers
124 views

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 ...
9
votes
2answers
2k 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 ...
2
votes
1answer
116 views

Correct UPS and PDU sequence

I'm pretty inexperienced when it comes to setting up power for a network rack. I have a location that has a dedicated 20 amp circuit with a LP-20P socket. I have a APC UPS 3000XL rackmount UPS and a ...
0
votes
5answers
199 views

interference between redundant power supplies

I have a number of dell servers and two UPS. I plan to give two different input to servers from two different UPS, my question is: A short circuit of redundant powersupply unit (PSU1) will trip one ...
1
vote
1answer
120 views

Power surge protection on office LAN, medium-small scale [closed]

I've got an office LAN setup with about 15 computers, which is due to expand to 30 before long. Each computer is on its own voltage stabilizer and UPS. I live in a place with horrible, substandard, ...
4
votes
2answers
1k views

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 ...
6
votes
4answers
4k 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 ...
2
votes
1answer
141 views

PDU With Configurable AMP Limit

I have a 20 AMP/120V circuit. The only device plugged into this circuit is a 1000 Watt Dell UPS. Right now several devices plug directly into the 1000 Watt UPS. I wanted to order a PDU to help ...
0
votes
3answers
73 views

ups and an unconfigured server

Say I have got a big room loaded with servers and a big cupboard size battery as a ups. Now the electricity fails. Is there some way for the servers to know that they should shutdown? Does the ups ...
2
votes
1answer
331 views

Uninterruptible Power Supplies: Line-interactive vs Double-conversion / online

We recently got an inline generator installed at our facility that backs up our IT room. It detects the outage and kicks on within about 20 seconds of an outage. For those 20 seconds between the ...
1
vote
2answers
245 views

Is this an NEMA L6-30R Plug?

My employer just bought a building with a decent server room. Before I go out and spend some money on a UPS, I want to confirm that this is actually an NEMA L6-30R (sorry for the poor image). I've ...
1
vote
2answers
212 views

Placing UPS in front of STS; Connecting Dual PSU to same PDU

The site has 2 x 16A @ 230V, each server/SAN has dual PSU set up. Options: 1) [2 x 16A] ---> [1 x STS or ATS]----> [1 xUPS]---->[2 x PDU]----->[DUAL PSU] As can be seen the server is actually ...
1
vote
2answers
380 views

What UPS would you use for remote network switches?

I came into work this morning to find out that one of our CISCO 2960s had died during the night, I haven't had a chance to figure out why, but I'm guessing a power spike killed it, and the surge ...
2
votes
1answer
380 views

MGE UPS Cut power - What happened?

I have 3 x MGE Pulsar M 3000 2700w UPS units within my server room which have run perfectly up until now. On Saturday morning I noticed that one of these UPS units was no longer outputting power, ...
3
votes
3answers
332 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 ...
2
votes
1answer
5k views

Remote shutdown of Dell PowerVault MD3000

It's heating up down here (Australia) and we always have power issues over the summer at one of our sites. We have a reasonable UPS with massive batteries and run an agent on our Servers that shuts ...
9
votes
1answer
282 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 ...
5
votes
7answers
1k 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". ...
7
votes
7answers
396 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 ...
11
votes
12answers
22k 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 ...
28
votes
9answers
13k 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, ...
49
votes
14answers
2k views

Is UPS worthwhile for non-production equipment?

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 ...