Questions tagged [electrical-power]

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

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Server experiencing Kernel-Power Event 41, but only once every two weeks

I go to check on a client's servers once every two weeks as part of an IT contract. For the past month and a half, their secondary server will experience a sudden shutdown and generate the Critical ...
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Nema 5-20 Female to Nema 5-15 Male Power Adapter for UPS: safe?

I bought a large UPS for my server and didn't realize it comes with a NEMA 5-20 plug. We're in a residential setting and don't have those outlets. I see Nema 5-15/20 Female to Nema 5-15 Male Power ...
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Poweredge R930 OOW and unable to boot entire server

I am facing this issue at our client server room. Scenario: 1-server r930 failed to boot eventhou level one diagnosis have been tried. For instance, drain server static electricity by unplug powercord,...
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59 views

How to protect 15-amp circuit from UPS with 20/30-amp draw

I managed to pick up a great deal on a CyberPower OR2200LCDRT2U UPS. Unfortunately this box has a NEMA L5-30P input plug (NOT a L5-20P as specified on the product page). In the location I'm trying ...
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Using (dual) ATS for dual PSU server?

There's two parts to my question: Does it make sense to hook up a dual PSU server to an ATS to speed up failover to the secondary circuit? If yes, does it make sense to use two separate ATSes to ...
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Plugging in a server rack with UPSes into a room that has its own UPS backup issues

Thank you everyone who's responded. There's been a common theme in some of the responses that I wanted to clarify since I wasn't clear in my original post. This is an upgrade that will replace their ...
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42 views

Is it possible to coonect the power to the sata power slot on a PCIE card from HPE ProLiant DL360p Gen8 server?

This is my first server and I never had one before... I recently need to use USB 3.0 for external HDD but there is none on this server, all USB 2.0. So I bought a "3 Ports USB 3.0 with 1Gbps ...
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256 views

Switching APC rack PDU via SNMP

How can I switch the outlets of an APC Rack PDU (AP7920) via SNMP (Linux SNMP command tools like snmpget/snmpset) ? I can't find anything about it. I was able to walk it via: snmpwalk -v3 -a MD5 -A ...
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130 views

How to upgrade APC Rack PDU?

I have an APC Rack PDU AP7920 (hardware revision B2, manufactured 07/21/2012). When I log in via telnet I get: American Power Conversion Network Management Card AOS v3.3.4 ...
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76 views

Is it safe to unplug a UPS during operation? [duplicate]

Interestingly there is no word in the manual and nothing to be found on the internet. But it seems like an obvious question: While a UPS (let’s use APC Smart-UPS 1500RM as an example) drives equipment/...
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105 views

Can I safely run a server with redundant power supplies off of a standard 15 amp outlet?

I purchased a used HP Proliant DL380p Gen 8 off eBay. It has dual redundant power supplies, both at 750 watts. Doing the math, I realize that if both PSUs are at peak load, they will pull 12.5 amps ...
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167 views

ZFS data lost after a rollback happening on reboot

Edit1: Unlike what I originally thought when creating this question, it seems that the problem was NOT directly caused by the unplanned power-cycle, but by a mistake I might have done with beadm in ...
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1answer
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Did HP ever advise splitting receptacles for redundant power?

As you know, some servers use redundant power supplies; they advise putting the two power supplies on independent circuits so a breaker trip won't down the server. Common North American 120V ...
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MegaRaid and power failures

I have a server that is currently working on migrating a RAID setup. There are 36 drives connected to an AVAGO 3108 MegaRAID, and as of this moment, the estimated time remaining is ~13 days. It's been ...
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UPS and PDU options for NEMA L6-30P

I have to say I don't know enough about supplying power to a rack. So here goes: This is for a room that will host network equipment (and maybe a server), in an office. Room has: some 120VAC outlets; ...
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1k views

How to estimate how much power my dual Xeon server would draw?

I'm planing to place a rack server into a colocation, but given that I'm on a tight budget, I try to estimate the total cost of ownership of the server. The data center where I will rent the ...
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1answer
94 views

Newbie to Supermicro redundant PSU

Until recently I have never had a redundant PSU or a rack server for that matter. So, I think maybe I did this wrong? I have a Supermicro FatTwin 6026TT-HDTRF (CSE-827HD-R1400B case) that comes with a ...
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62 views

Step up voltage converter in datacenter?

I am setting up a rack in the data center that only has 110V. It is redundant, so I thought I could take one from each leg and get 110V, but when I used a voltmeter last night they somehow are on the ...
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131 views

How to secure this power cable on a network switch?

The device is an HP EI A5120 network switch. Is there a way to secure this power cable? Some other devices you can use a zip tie on these tabs. I searched but did not find a retention bracket from HP.
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144 views

Can a Vertical PDU be mounted in an enclosed rack?

I purchased an enclosed 12U rack as well as Vertical (0U) PDU, but can't figure out how to mount it in the rack vertically. I assume I need to mount it on the side posts of the enclosure, since, if I ...
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1k views

HP ML350 G6 will not power on

I have no lights on MB or back of power supply. I have replaced power supply and added a redundant power supply. I replaced PD board or backplane whatever you want to call it. Still same result. ...
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1answer
81 views

Is there a UPS like devices to prevent circuit breaks during short periods of high load?

For example, let's say I have a 10 amp circuit. Under normal load the hardware only draws 6 amps. However, it is possible that the hardware could draw up to 11 amps (for instance during boot). Is ...
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HP Proliant ML350 G6 Power backplane diagonsis

I get no lights at all. I am looking for some sort of testing procedure on the board level as I am not sure if the issue IS power plane related, or if it is just a bad main board. the power supply ...
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66 views

Server Rack, Power Strips and UPS

I would like to get rid of all the messy power cords behind our server racks by using short power cords (1's and 2's) with multiple power strips connecting to two different UPSs on separated circuits. ...
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1answer
145 views

Does IPMI-DCMI power consumption include GPU?

I'm using FreeIPMI to measure power consumption with --get-system-power-statistics on servers which contain GPUs. Will the returned power consumption in watts include that of the GPUs? The ...
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91 views

How to test server's peak draw on electrical amperage?

I'm moving my server to a co-location center and they'r not concerned with the actual wattage, which is what I've tracked, but they are very concerned with the peak amperage. They charge by the amps ...
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1answer
120 views

Uninterruptable power supply with digital output designating mains/battery state

I want to have some equipment connected to a UPS to shut down gracefully when mains is cut. This equipment does not have capability to read serial or USB, so software solutions are out. What I'm ...
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99 views

SGI Rackable Systems server, what type of power connector

I purchased a used "Rackable Systems" server off eBay and I discovered to my surprise when it arrived it has power connectors which appear to require ~48 volts DC input. It looks like this: What ...
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1answer
1k views

Make an old server more power efficient - HP DL380 G7 [closed]

i recently picked on ebay an old HP DL380 G7, i think it was a great deal, lots of disk space and a very low price, for what I need, it was a great deal. These are the specs: CPU: 2 x INTEL XEON ...
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1answer
105 views

Step-Down 400/230V to 120V without a stepdown transformer

At my current data center, 400/230V is delivered to the racks. Is their any way I could step this down to 120V without a transformer? I'm trying to see if maybe there is a PDU that exists that can do ...
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2answers
109 views

How to gracefully shut a computer down with a wall mounted light switch

I am sysadmin and my company has tasked me with a project I am not quite certain how to complete. A local museum has a small Intel NUC-like computer running Windows 10 that displays an automated ...
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1answer
109 views

Is it possible to run HP DL580 G5 on just 2 processors and 2PSUs?

So I just acquired a HP DL580 G5 server with the following config : 4X 6 core Xeon 7450 2.4GHz processors 128 GB RAM 6 X 72GB SAS drives 15K I noticed that it requires at least 3 power inputs to ...
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1answer
20 views

On boot, server pulls full load of both PSUs -- any way to limit this or mitigate load spike?

I have a giant 24u server (Supermicro 4U X9DRI-F w/ 2x Xeon E5-2680) with 2 1200w PSUs. However, I only have 4 drives in right now, and my actual power draw (under the most stressful loads) is likely ...
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73 views

Exascale Power Consumption

I have read a lot of articles about exascale and found out that it may consumes approximately 20MW power envelope. Is it a daily basis or a yearly basis or every second? Please enlighten me. Here are ...
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Is there a way to protect SSD from corruption due to power loss?

We have a group of consumer terminals that have Linux, a local web server, and PostgreSQL installed. We are getting field reports of machines with problems and upon investigation it seems as if there ...
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1answer
101 views

Does it make sense to connect a redundant power supply to a C14 splitter?

Recently visiting a small data room, I noticed that redundant power supplies of a server are connected through a C14 splitter which, in turn, is connected to a single socket of a UPS. I told the ...
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51 views

Is it impossible to accurately measure the health of a Lead-Acid UPS?

In a blog post from Schneider Electric (parent company of APC, the UPS manufacturer), they say that lead-acid UPS batteries "rely on chemistry that makes it hard to accurately predict when they’re ...
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57 views

Debug sudden shutdowns

I have two (new)workstations showing weird symptoms: they randomly power off without any sort of warning or delay,... They just may or may not power off at any given time and reboot after that. The ...
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2answers
44 views

Power server when power is on (No Bios access)

I have 3 servers and one is old hardware. I have frequent power outage due a Kw limit. I know there is an option in the BIOS to power on a machine when there is power. 2 servers does have this AC ...
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862 views

Additional SATA power on PowerEdge T130?

I have a new PowerEdge T130 that came with two SATA drives in RAID 1 setup on a PERC ctrl. I want to add another SATA drive not connected to the PERC controller. I opened the case up and see there's ...
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2answers
5k views

HPE DL560 Gen8 Power fault detected. What does that mean?

my DL560 Gwen 8 generated this problem. System Power Fault Detected (XR: 14 00 MID: FF 0D F0 0C C0 FF FF 0A 0A 0C 0C 00 9C 40 00 01 03 47 00 00 00 00 00 00 00 00 00 00 00 00 00 00) and powerd off ...
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1answer
2k views

Should you occasionally discharge UPS to higher degree?

We're occasionally experiencing some short outages (few minutes at most or even seconds) so batteries in UPS almost never get below 90-80%. Is it advised to sometimes (eg. once half a year) perform ...
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1answer
179 views

Mixing mdadm RAID with partially power loss protected SSDs

I have created a mdadm RAID 10 with 4 SSDs. 2 of those SSDs are consumer models and does not have the power loss data protection feature. At the RAID creation i have put 1 SSD with power protection ...
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1k views

What scale of data loss or corruption do I risk if I enable the write buffer on a file server?

I have found plenty of articles online warning of risk of data loss or corruption for drives with write-buffer enabled in the event of power loss. However, I haven't found any that actually refer to ...
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175 views

Electricity outage killed 4 out of 6 UPS

We recently had an electricity outage of 1-2 seconds at one of our buildings. In this building we have 6 UPS and 4 of them died while/after the electricity outage and all the servers were powered off. ...
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1answer
622 views

UPS inside server room?

In my company we are considering to move our servers (some are mounted on 25U rack and some are tower servers) to a newly created room (underground, no windows) that contains 40 KVa UPS and redundant ...
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1answer
296 views

Cisco Catalyst 2960-48TT Switch Power Supply

What exactly is the power supply for the Cisco Catalyst 2960 Switch? This is probably a very dumb question. I bought one and while it had 2 terminals for power adapters it had no power cords packaged ...
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1answer
40 views

Loud Pop from DL380G5--then neither PSU lights up when plugged in

I wanted to fire up my old DL380 G5 server recently, and maybe one second after I hit the power button and the fans started to rev up, I heard a loud pop and suddenly it shut down. Now neither PSU ...
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2answers
431 views

Redundant UPS with 2 power sources

I've 2 power sources in my house: One from the national power grid and another from an internal power source. I've several power sockets in my server room from these 2 sources. Did some research and ...
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1answer
4k views

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

I just bought a server and realized that it had power for all my drive bays, but not for the internal SSD I bought for it. It does, however, have 2 free 4-pin floppy power connectors: Is it possible ...

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