50 votes
Accepted

How do servers with redundant power supplies balance consumption?

I'm going to give an HP Proliant-specific answer here, since the OP is asking about the HP product line. Let's use the example of an HP DL360p Gen8 (also applies to G6, G7 and Gen9 servers): You ...
  • 195k
33 votes
Accepted

Can Running a Server's Redundant PSU on Different Circuits Damage It?

With multi-phase AC systems (motors, etc.), you're right, bad things can and will happen if one of the phases drops out. However, with computer PSUs, each of them operates completely separately, ...
  • 109k
33 votes
Accepted

Is it safe to use a UPS designed for desktop PCs to power a server?

I would not plug a server with a power supply capable of drawing 750 watts into a UPS which is only rated at 240. The issue isn't really that it's a "server" or "desktop" UPS. You're likely to ...
  • 5,341
26 votes

Plugging in a server rack with UPSes into a room that has its own UPS backup issues

Your typical UPS (i.e., excluding a double-conversion UPS), including all APC SmartUPS that I've worked with in the past, does nothing to the power except when running on batteries. It will draw a ...
23 votes

Plugging in a server rack with UPSes into a room that has its own UPS backup issues

Every data center/server room I've ever been in and worked in, that had its own UPS system, has prohibited customers, clients, etc. from using their own UPS systems. I can't speak to power harmonics, ...
  • 109k
22 votes

How to disable all power management in Ubuntu (for a server netbook)?

On Ubuntu 16.04 LTS, I successfully used the following to disable suspend: sudo systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target And this to re-enable it: sudo ...
21 votes
Accepted

Dual power supplies on the same circuit

No, not really. This is a perfectly good way to protect against a power supply failing, as long as it doesn't fail in such a way as to draw massive amounts of current (very unusual). Normally people ...
17 votes

Is it safe to use a UPS designed for desktop PCs to power a server?

Your UPS provides power when the utility mains drops, and protects from transient under and over voltage/current conditions. Given you can plug a desktop or a server or a UPS into the same supply ...
  • 2,289
17 votes
Accepted

Is there a way to protect SSD from corruption due to power loss?

When suddenly losing power, MLC/TLC/QLC SSDs have two failure modes: they lose the in-flight and in-DRAM-only writes; they can corrupt any data-at-rest stored in the lower page of the NAND cell being ...
  • 44.4k
15 votes
Accepted

How can I determine the power demand of an HP server's power supply under load?

Yes, you can run this server happily in under 2.5 Amps total... I can show you real-life utilization for that server platform/model. Watts = Amps x Volts Your power regulator and power supply ...
  • 195k
12 votes

How do servers with redundant power supplies balance consumption?

it depends If you go into setup (F10) you can choose the power management mode and usually there's a few options including the active/passive options you suggest as well as a balanced mode. I buy ...
  • 100k
11 votes

Dell PowerEdge: powersaving BIOS settings differences

The following Dell Whitepaper goes in depth on the differences between the different power profiles: http://en.community.dell.com/techcenter/extras/m/white_papers/20248740 (page 20-36) Below you can ...
  • 285
11 votes
Accepted

Is there any reason to keep the power option on default "Balanced" instead of "high performance"?

Short Answer With modern processor, with fast C6 (core/module power gating) capabilities, the difference in power consumption between the two power profiles is negligible. On the other hand, due to ...
  • 44.4k
11 votes

Is there a way to protect SSD from corruption due to power loss?

Yeah. Don't get super cheap SSD - anything outside the low end consumer market has capacitators and full protection against power loss. Amd really does not cost that much more.
  • 51k
10 votes
Accepted

Floppy power to PCI-E card in DL380 G5

Edit: For what you need, I'd really suggest trying a different sound card. But if you want to see MacGyver... I've needed to provide auxiliary power in various HP ProLiant 2U chassis configurations. ...
  • 195k
10 votes
Accepted

New UPS Batteries Dying in Months

That is not well known feature of the APC Smart UPSes. Each time your UPS goes back on the wall and the batteries are recharged, controller counts the energy stored in them. Acid accumulators have ...
  • 6,864
9 votes

How do I move a server to a new power source without powering it off?

Just schedule downtime and turn the server off. Without a dual power supply setup, you don't have any other reasonable options. If there are business constraints or otherwise, you should note those ...
  • 195k
8 votes

Plugging in a server rack with UPSes into a room that has its own UPS backup issues

Fire safety. The datacenter operators should be able to kill the power to the room, should an emergency happen. Your UPS units are outside of their control. Batteries themselves are dangerous. A ...
  • 614
7 votes

Cost of running a specific server based on consumption

I wouldn't recommend using that server today. The HP ProLiant DL585 G2 is a very old system (end-of-life: 2008). It is/was not a power efficient system. Power utilization for that platform was ...
  • 195k
7 votes
Accepted

Can you exceed power rating on a UPS with additional battery packs

The Wattage and VA rating of the UPS represents the load that the UPS can protect. The battery and expansion packs only exist to increase the runtime of the UPS. I would suggest multiple 2200VA UPS ...
  • 195k
7 votes
Accepted

Is it possible to convert 4-pin floppy to SATA power?

Yes, it is legit. All of these adapters use +5V or +12V pins with some earthing. The adapter what you want to buy does only the physical conversion, because no electrical conversion is needed. You ...
  • 4,924
7 votes

Is there a way to protect SSD from corruption due to power loss?

The first thing to do is to define recovery time and recovery point objectives. How long do you have to recover one of these terminals, and what data point in time is acceptable? Perhaps within a ...
6 votes

How can I determine the power demand of an HP server's power supply under load?

There is a vast difference between the maximum rated power consumption a supply can handle before it burns out the fuses and the actual current a server will draw. HP provides a power calculator ...
  • 73k
6 votes
Accepted

Cost of running a specific server based on consumption

The power consumption will vary widely depending on the load and activity on the server, measuring it with a consumption device can be very misleading. The running costs will thus vary a lot depending ...
6 votes

New UPS Batteries Dying in Months

My thought is that you should have an electrician check the quality of the power. I have this same issue in a number of the plants I support. Our issue is that the plants have dirty and uneven/low ...
  • 61
6 votes

Can Running a Server's Redundant PSU on Different Circuits Damage It?

The job of the power supply is to take power that is not 100% clean and make is stable. People working in data centers have been fired for not having the power supplies run on different circuits. If ...
  • 474
6 votes

Is it safe to use a UPS designed for desktop PCs to power a server?

Back-UPS is not suitable for server protection. More or less suitable is the smart-UPS that has a way more sophisticated controller inside. The typical operation cycle for a power supply when the wall ...
  • 6,864
6 votes
Accepted

Why do servers have 2 PSU?

You have two power supplies for redundancy. Assuming they are hot-plug, if one fails you can replace it while the system is still running. You could also run to separate servers in your data center ...
  • 129k
6 votes

Plugging in a server rack with UPSes into a room that has its own UPS backup issues

Aside from the practical problems, most UPS manufacturers, including APC advise you not to do it and it will void your warranty. Additionally, using equipment not as designed may violate local ...
  • 1,206
5 votes

Floppy power to PCI-E card in DL380 G5

If you get an USB->Molex adapter, you can then add a Molex->Floppy adapter. This would also be required for @Gene's solution. McGyver would not want to be a part of this. Side note: A USB->Molex ...
  • 97.6k

Only top scored, non community-wiki answers of a minimum length are eligible