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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.

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Proper Sizing for PDU's/Power in Rack

I've struggled with sizing my power sources and associated PDU's in my server racks. Somehow I feel like I'm way oversizing things based on nameplate requirements on power supplies. My simplistic approach is to look at the nameplate draw on my…
Andy
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Automatic shutdown when idle?

We have about 600 Windows XP PCs in a school of about 2000 students, the majority of the PCs are in ICT suites and class rooms. It is a regular occurance that half of the computers are left on overnight and about a quarter at weekends and…
Richard Slater
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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 based on data sheets from manufacturers of the…
adamstrawson
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Maxing out both PDUs in a rack with redundant power

If I have a rack full of servers using redundant power supplies, and I'm keeping the amps at 80% (16A of 20A), isn't this still asking for trouble in the event of a power loss on one of the circuits? If power is distributed 50-50 (e.g. an average of…
Matt Beckman
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Source of PDU De-Rating?

In researching PDU's I have noticed most cite a derated current at the 80% level. For example, 30A is derated to 24A: Tripp Lite: Raritan: Does anyone have anything that shows what agency this is (NEMA?) and these actual regulations? Also, does…
Kyle Brandt
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How to step down voltage from 208V to 110V

I have some racks that will be fed by 208V/20A circuits. These circuits will be conditioned and battery-backed by the facility in which these racks will live. 99% of the devices in the rack will be able to support 208V input, so I plan to use these…
Eric Dennis
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How to utilize IPMI on Windows?

My organization is primarily a Dell shop running Windows. Most are recent models that support IPMI 2.0. (Dell 1950, for example). At a minimum I'd like to use IPMI to perform remote chassis power on/off, such as when a server is hung and no one is…
spoulson
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Cheapest way to remotely control 120v outlet via ethernet?

What is the cheapest solution to be able to remotely power cycle a regular 120V outlet via ethernet? I've seen solutions like iBoot, but they're really expensive. Is there a cheap way to remotely power cycle equipment?
Robot
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Dell PowerEdge: powersaving BIOS settings differences

I'm closing in on purchasing a Dell PowerEdge R710 rack server and am curious to know the difference between Dell's power saving bios setting and their performance bios setting. Should I be concerned about choosing the power saving setting? I'll be…
JohnyD
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How can I calculate a server's amperage?

When ordering co-location services, a certain amount of power is included, for example 0.25 amps, 0.5 amps, 1 amps, 2 amps, etc. How do I calculate how much a server is going to require?
davidmytton
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Power Cables Required to Switch from 120v to 240v for Dell Poweredge Servers

We have a cabinet of servers and other hardware (switches, firewalls, etc) that all are currently running on 120v. I've confirmed that the power supply for all of our devices support both 120v and 240v and I understand we'll need to get a 240v PDU.…
Dan
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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 the Host (including first shutting down the VMS)…
martin
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10GBASE-T shielded cable switch-to-server connection

I'm venturing for the first time into the 10 gigabit (over copper) realm. Likewise, I have never worked with shielded CAT-5/6 cables previously. From my own research, I understand the types and benefits of shielding when it comes to long runs of…
VokinLoksar
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How to check CentOS 6 Server VM Host after a power falure?

This afternoon, someone at our office decided to pull the plug out of our server because it was storming outside. They didn't shut it down, they just pulled the plug out while it was running. The server has 4 SATA drives in a software RAID 10…
Nick
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automatically shutting down an ESXi host nightly

We just picked up a new development server that I've loaded ESXi on. The room it's in is well ventilated during the day but at night the door is closed and it gets quite toasty in there. I've been asked to have the box shut down nightly, as we won't…
ceejayoz
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