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Questions tagged [electrical-power]

Power is required for all our servers, desktops, and other electronic devices to operate.

Power is required for all our servers, desktops, and other electronic devices to operate.

435 questions
250
votes
14 answers

What is this very short power cable called?

I have a couple of networking components in my rack that take giant AC adapters ("power bricks") that don't fit neatly into my rackmount PDU. I have one "thingy" that is shown below, and I need to buy a few more. But I have no idea what I'm…
Portman
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12
votes
4 answers

Choosing the right AWG for Server Power Cables?

When getting power cables for servers, there are various AWG (American Wire Gauge) choices to make. The ones I have noticed are 18 and 14; 14 is thicker so will be a little more stiff. But, I am also wondering how I determine if I really need the…
Kyle Brandt
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8
votes
7 answers

Which is better - 30 AMP 220V circuit or 60 AMP 120V circuit

I'm looking for advice on which electrical service I should have run to a rack that I have in a data center. The price is the same for either a 30 AMP 220V circuit or a 60 AMP 120V curcuit. I realize that these two curcuits are delivering effectivly…
Richard West
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7
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3 answers

Dual power supplies on the same circuit

As the title says, I have two power supplies in a server on the same circuit. The circuit is connected to surge protection, power filtering, and UPS. The only reason I use both power supplies is because: I'd like to be prepared against a failing…
Ken - Enough about Monica
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7
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4 answers

Power consumption of a computer in sleep mode?

How much power do (relatively new) computers consume while in sleep mode? By sleep mode, the computers' fans are turned off, producing no noise; and the LED on the power button blinks. Do I need to be concerned about the power used in this state…
unknown
  • 193
6
votes
2 answers

What to look for when purchasing a power generator?

After an extended power failure that caused our UPS to run down and have issues coming back up once power was restored, I'm looking into getting a generator. What do I need to look at when specing a generator? I know I will have to calculate how…
Grant
  • 17,989
6
votes
2 answers

What's the maximum number of computers I can safely power on a 13-amp supply?

Due to a lack of power in a new office building, I am having to daisy chain strip plugs off a single socket. Roughly speaking, how many amps does a desktop computer with screen consume? How many might be safe to attach?
chrism2671
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3 answers

Server automatic power On/Off

How can I automatically power off a server at 20.00pm and turn It On again at 8.00am in the morning? Is there any sw or hw tool that makò me able to schedule On/Off time? The server could be anything Linux/Mac Os X/Windows. EDIT: I mean something…
microspino
  • 434
3
votes
1 answer

What is the proper power cord for the usual rackmount server?

I'm trying to clean up a rackmount power environment, and wanted to check on the power cords. Currently, it seems that what I would consider to be appropriate are labeled mostly as 14AWG: 14AWGX3C 3X14AWG Some are labeled as 18AWG, though most I…
Mei
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3
votes
4 answers

Server power meter, 220V

I would like to monitor my server power usage over time, but I'm in 220V area (Europe), and everything I can find on the net is for 110V, like this one here: Kill A Watt Load Meter It seems like everything I can find is fitted with UK plugs, and I…
Daniel Mošmondor
  • 301
2
votes
3 answers

changing C-state governor

I learnt that we can change P-state governors with the command echo "ondemand" > /sys/devices/system/cpu/cpu0/cpufreq/current_governor How dooes one change the C state governor ?
kashyapa
  • 337
2
votes
5 answers

How to power on a system automatically when AC Power is back and it was powered off properly?

I have a system in which I have no access to the power button, so I need it to power on automatically. I have set the 'restore on AC Power Loss' option and it works fine when I turn off the system abruptly but if I shutdown the system properly…
Luis
  • 21
2
votes
1 answer

Will a 20 Amp Circuit Work for 2 servers with 2 PSU ea. needing 9.2 Amp Input Requirement per PSU?

I'm a bit new to the power calculations for electricity at a colocation facility. I have 2 HP DL580s that are pretty maxed out and this is what the HP power calculators gave me for each server. Total System Input Requirement (A) - UPS/PDU Circuit…
Ian
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2
votes
3 answers

Lower power usage / noise

I do computational biology and I have a pretty heavy-duty setup sitting right next to my bench. It includes the following: 1x HP ProLiant DL385 G7 Server w/ 2x 12-core AMD Opteron processors (6174, 2.2GHz, 80W) + 96 GB ram (8x8GB). 2x HP…
Ron Gejman
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1
vote
2 answers

what technical specifications should I take into account for a network of 20 computers?

I need to know that electrical characteristics are necessary for a network of 20 computers. There are just 20 PCs in a room. There aren't servers and are connected in series. I just need the information to electrical calculations.
Gusinuhe
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