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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.

436 questions
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What *exactly* gets screwed when I kill -9 or pull the power?

Set-Up I've been a programmer for quite some time now but I'm still a bit fuzzy on deep, internal stuff. Now. I am well aware that it's not a good idea to either: kill -9 a process (bad) spontaneously pull the power plug on a running computer or…
Mike
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How can I determine the power demand of an HP server's power supply under load?

I bought an HP DL360 G7 1 U rackmount server. I am looking to put it in a colocation facility. The issue is almost every facility I have seen either limits the amount of power I can access or charge extra for more power over the base amount…
AtomicPorkchop
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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 Tripplite 2000VA rackmount Server UPSs and behind 30A…
thadk
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Why is it important to ensure equipment is well-grounded?

I am installing a new ethernet switch, and the instructions say to connect the ground screw to the rack or some other kind of electrical ground. What are the risks of not ensuring that equipment is properly grounded? Is it because of concerns for…
Nic
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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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Hooking up many different external HDs simultaneously

I need a large amount of external storage for an upcoming project. I'm planning on purchasing 10 2TB external drives. I need them all hooked up to a single machine at the same time. What issues will I run into? I plan on using 2 power strips and…
cbizz
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Datacenter Power requirements. A=W/V.... I must be doing something stupid

Okay, our datacenter doesn't charge us based on our "useage" just on how many Amps we have delivered to our rack. I'm planning on putting in a new rack this upcoming year for some server expansion, based on This article. Each server has a…
grufftech
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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. It seems that I am having to replace the batteries…
TriadicTech
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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 one are easily moved, however this cabinet's UPS'…
SnakeDoc
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Using 48v for servers

I'm currently in the middle of a process to specify and design a new server environment for graphics and video rendering. We know we want to use blades, and we're pretty sure of our vendor decisions. We've got one massive problem, and that's…
Tom O'Connor
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Laptop waking from sleep

I have a laptop which has "recently" turned into the proverbial baby, and refuses to sleep through the night, or for that matter, through some days. I'm a little lost when it comes to trying to debug what is causing it to wake for no apparent…
Rowland Shaw
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What is the difference between init 6 and reboot on Red Hat / RHEL / CentOS?

In Linux, the init 6 command gracefully reboots the system running all the K* shutdown scripts first, before rebooting. The reboot command does a very quick reboot. It doesn’t execute any kill scripts, but just unmounts filesystems and…
ujjain
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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 one specifically) I had to change it's batteries…
Saariko
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Should pcs be unplugged before restoring power

We have an upcoming scheduled power outage for maintenance. UPS protects our servers. But it has been suggested that all PCs should be unplugged to prevent damage from power surges when power is restored. Is this precaution really necessary?
Rory
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Powertop reports "Bad" "Runtime PM for PCI Device"

I've noticed that powertop utility reports "Bad" "Runtime PM for PCI Device" for several devices. Seems that powertop can fix the issue but it won't tell what exactly it does to fix it. What should I do to fix that "Runtime PM..." issue?
Alexey B.
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