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

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-2
votes
0answers
57 views

Low profile webserver? [closed]

I want to setup a low profile webserver, preferably using Ubuntu. It needs to run Apache, PHP, MediaWiki, and some SQL variant. Not intended for heavy work, it's just for internal usage. Also no media ...
9
votes
1answer
308 views

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 ...
5
votes
1answer
67 views

Using more than 80% power on a circuit in a disaster scenario

We currently have two cabinets of equipment at our datacenter, and each cabinet is served by two 30A circuits. The facility is relatively new, and each circuit is (supposedly) redundant at the source. ...
1
vote
1answer
67 views

desperately need 110v from a 208v pdu [closed]

I'm in a bit of a pickle... We're moving a client's infrastructure to a colocation facility. We have redundant 208v/30amp PDUs. While installing today, we realized that the client had a small ...
3
votes
2answers
177 views

UPS unable to power the 1U server

1U rack server: http://ark.intel.com/products/67786/Intel-Server-System-R1304GL4DS9 Power backup: http://www.apc.com/products/resource/include/techspec_index.cfm?base_sku=BR1000G-IN When I try ...
1
vote
1answer
158 views

iSCSI Datastores not found after Power Failure

I have an ESXi 5 host running 3 virtual servers. 1 of these servers uses a datastore via Software iSCSI on a separate piece of hardware. When the two hardware servers (storage and host) experience ...
5
votes
2answers
86 views

UPS for 30A service to server racks

Our server rack has two 208V 30A dedicated circuits running to it, each to a PDU mounted in the rack. Most of the equipment has redundant power supplies so one goes to each PDU. I'm not sure who had ...
0
votes
1answer
209 views

NVIDIA Tesla K20C in Dell PowerEdge R720xd — power cables

I am trying to put an NVIDIA Tesla K20C into a Dell PowerEdge R720xd. I'm having a bit of trouble understanding the power requirements of the card. First, here is a picture of two pages of the ...
9
votes
4answers
213 views

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? ...
2
votes
2answers
54 views

Two APC Symmetra LX 16kVA into one common output?

We have 2x APC symmetra LX 16kVA units running at the moment and have read (in Eaton's documentation) that their UPSs can have a common synchronised output (based on input phase or set phase with a ...
0
votes
1answer
99 views

PowerEdge 2850 RAID 0 Configuration - Drive not found

I have two 73GB 15,000RPM HDD in my PE2850 that I need to stripe as one logical drive so I can install MS SBS 2011 (which requires an 80GB volume minimum). I enabled RAID in the BIOS and paired the ...
1
vote
0answers
110 views

Error in AIX : 0516-040 : Unable to read the specified physical volume

Please provide me your valuable suggestions on the error beow in AIX. When I'm running the following command on the AIX server lsvg -l rootvg I'm getting this error: 0516-040 : Unable to read the ...
2
votes
3answers
64 views

How should mains power be conditioned for devices not protected by a UPS?

UPSes protect devices from more that just power outages. I've got a Schneider SURTA2200XL UPSes (manual here). It protects against all of the following: undervoltage (aka brownouts) overvoltage ...
0
votes
0answers
40 views

Determining a laptop fleet's battery health

I'm trying to determine the battery status of my school's laptop fleet. I should be able to extract this using WMI (as per http://msdn.microsoft.com/en-us/library/aa394074(v=vs.85).aspx ) but the ...
5
votes
1answer
65 views

Power Control Compartment?

I recently purchased an IBM enclosed, rolling rack that had a 6 drive server, huge battery backup, and this strange item called a "Power Control Compartment" I cannot find any good documentation ...
0
votes
1answer
71 views

Can my cisco C220 run on 220v instead of 110v and if so, how do i change it?

We have both 220v and 110v power at our data center, but have more capacity left on the 220v circuit so i would like to put our new c220 server on it. What does it take to make this happen?
1
vote
1answer
60 views

power monitoring capabilities of ibm x3550 m4

I don't understand how monitoring of power consumption of x series servers is done with IBM AEM - I'm specifically interested in x3550 m4. The documentation on the servers does not really highlight ...
3
votes
2answers
97 views

Does the exact same load use the same amount of power on different processors?

Let's say that we have a set workload doing a set amount of work. If I have two identical servers, one equipped with a E5-2660 and one with a E5-2670 and otherwise identical hardware, will the total ...
1
vote
2answers
90 views

Server 2008 R2 - Allow UPS to wake computer?

I have a single Windows Server 2008 R2 box that's on a generic Geek Squad battery backup. (That purchase was not my choice.) It shuts down fine when the battery hits a critical level, but I can't seem ...
5
votes
2answers
54 views

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 ...
0
votes
1answer
159 views

Does a Dell PowerEdge 1850 have a way to get Molex 4 pin power?

I have a PCI card that needs 4 pin power hooked up to it and wondering if there is a way to supply it inside this server.
1
vote
1answer
114 views

HP DL380G5 with APC SC1500 UPS — transfer time failure

I have 2 of these things: APC SmartUPS SC1500 (220v). My Proliant G5 DL380 PSUs seem to really hate them. This is what happens when UPS switches to battery (PSU2 is plugged into the SC1500): iLo IML ...
4
votes
2answers
375 views

Understanding redundant power supplies

Im looking into the cost of putting a Cassandra cluster into a colo facility. Along these lines there would be 6-8 servers at the outset with expected growth over time. One option is just a series of ...
1
vote
1answer
165 views

Backup Power System for a Small Office: UPS, ATS, Generator etc

I'm trying to put together a backup power system for our office and I need some guidance. We frequently lose power for several hours at a time. I'm looking for a solution which would: Control ...
0
votes
3answers
212 views

How can i measure the power consumption of a PoE switch?

I have to measure the power consumption behavior of switches which are powered with PoE and which also provide energy to other devices. How can this be done? regards
2
votes
1answer
271 views

Powershell Hyper-V Remote?

Im basically wondering if this is possible, Essentially I have a Powershell 3.0 Script that creates a Hyper-V Server/VHD etc.. it works well but it's obviously defaulting to my local machine. What Im ...
-2
votes
1answer
43 views

hardware to monitor if power is available [closed]

Our server-cage is working on 3-phase power. I had this week this unpleasant surprise that one of 3 fuses went off. Can somebody advise me on some (simple) schematics that would allowed me to check ...
1
vote
2answers
95 views

Redundant Power System integration

We currently have a stack of catalyst 3750's at the core of our network. We just purchased two new 3750's to split off our VMs and SAN onto their own switches and away from the stack. These two new ...
2
votes
1answer
1k views

HP ProLiant ML350 G6 powerup issue

My setup: HP ProLiant ML350 G6 (2x PSU/redundant) I present my issue in a few steps: Power cables disconnected (no power coming to server) Re-connect cables Press "Power button" -> I can see green ...
4
votes
2answers
120 views

Does the additional load on UPS in case of grid failure amount to 100%?

The scenario is as follows: Servers are equipped with two PSU's each. One of these is connected to the UPS, the other one directly to the power grid (bypassing the UPS). I would assume that since the ...
5
votes
2answers
5k views

ipmitool - can't find /dev/ipmi0 or /dev/ipmidev/0

Based on a previous question, I installed ipmitool (yum install ipmitool). Even after a reboot, though, i get the following error when trying to run ipmitool power status: Could not open device at ...
0
votes
0answers
72 views

Monitoring redundant Power Supply on ASUS Z8NA-D6

I have a Windows 2008 Standard R2 server with a redundant power supply (2 modules, hot swap). The customer asked me to monitor the PSU because they can't hear it beeping. It's connected to an APC ...
2
votes
1answer
291 views

Small Office server rack - power requirements

We're building an office for a small business, and the electrician is starting rough-in next week. I'm doing all of the low voltage wiring myself. We have electrician for 120V wiring.I have a ...
18
votes
7answers
2k views

Using Y power cables in a datacenter

I've always assumed that using Y cables from the PDU to redundant PSUs in the same server was totally acceptable practice, however I was recently speaking to someone that said that their colo wouldn't ...
5
votes
7answers
10k views

VMware ESXi shutdown triggered by APC UPS connected via USB

I am shipping a bunch of ESXi 5.1 servers to remote offices where they will be powered via APC UPS. I would like to have the UPS trigger a shutdown of the connected server - I would then rely on the ...
2
votes
2answers
381 views

What happens with the Guest OS's on ESXi in the event of a power failure?

Many small businesses would prefer to let their server drop on power failure than to pay even $100 for a cheap UPS. It's often difficult to convince them of the value of something like that; it's why ...
2
votes
2answers
288 views

Does disabling a USB port stop power from being provided on pins 1/4?

This is hopefully a simple question. When you disable a USB port at the BIOS level, or if it is disabled by group policy/at the OS level, does it still provide the +5VDC power on pin 1? I ask because ...
6
votes
3answers
1k views

Choosing the right AWG for Server Power Cables?

When getting power cables for servers, there are 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 ...
0
votes
1answer
56 views

Why would Windows 2008 lose its backup schedules at shutdown?

We recently powered down a Windows 2008 server for a weekend as the building power supply was being worked on. Right up until this shutdown, the backups have been happily running daily every day ...
0
votes
2answers
124 views

unexpected server power off

Once or twice per day I find a server I have powered off with no apparent reason. Info and what I've done until now: Nothing is being reported under /var/log/. Just normal server activity and then ...
1
vote
2answers
70 views

POE and AC power

Could there be any issues having both POE and AC power attached to a WAP? I'm curious because I found a few WAPs that had both...wondering if I should pull AC or just let it ride?
-4
votes
2answers
66 views

What's the deal with using unreliable green energy in datacenters? [closed]

The news say that Google now uses 48 MW of electricity produced by wind turbines to power one of its datacenters. I've always heard that "green" energy is great, but it is unreliable - wind doesn't ...
0
votes
0answers
23 views

Server only powers (but doesn't POST) when IDE drive is powered

So after a thunderstorm last night which did a little damage, a Gigabyte server has decided it's going on power on but not POST. If it is POSTing, it's doing a very bad job at telling me. No beeps, ...
0
votes
3answers
140 views

Power-over-Ethernet: Designing PSD with less than 48V?

I want to use Power-over-Ethernet for an IP Camera. On the host-side, which also is the PSE (Power Sourcing Equipment) I have my own hardware. On this hardware I just have 12V of supply voltage. ...
9
votes
2answers
2k views

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 ...
6
votes
3answers
411 views

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 ...
1
vote
2answers
178 views

Power-over-Ethernet: 100 Mbps Device compatible with 1 Gbps Source?

I have an IP Camera, which is supports Power-over-Ethernet. The relating Ethernet Switch on the camera supports 100Mbs. Now when I want to support the camera with Power over Ethernet, will it be ...
2
votes
1answer
113 views

Correct UPS and PDU sequence

I'm pretty inexperienced when it comes to setting up power for a network rack. I have a location that has a dedicated 20 amp circuit with a LP-20P socket. I have a APC UPS 3000XL rackmount UPS and a ...
1
vote
1answer
263 views

Self-Resetting Power Strips? [closed]

We are about to deploy a number of secure kiosks into an environment where they may be prone to lightning strikes and power surges on a somewhat regular basis (southern Florida in a place where the ...
0
votes
1answer
92 views

Metered-By-Outlet-Monitoring PDU [closed]

I see APC offers Metered-By-Outlet PDUs, however they only offer 30A - 32A 208V PDUs. (URL: http://www.apc.com/products/family/?id=478) We are looking for a 16A 120V PDU that offers power usage ...