Power is required for all our servers, desktops, and other electronic devices to operate.
4
votes
2answers
237 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
49 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
86 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
-6
votes
1answer
38 views
UPS power calculation [closed]
A UPS has an energy rating of 85% and contains a fully
charged battery that is rated at 48 V, 3 Ah (Ampere Hour).
If a load of power rating 200 W is connected to the UPS,
then what is the ...
2
votes
1answer
152 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
40 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
80 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
257 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
65 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 ...
1
vote
2answers
272 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
52 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 ...
-5
votes
2answers
42 views
Power requirements for server setup at home [closed]
I am trying to host my website at home and for this, i am trying to do some power wiring to bring in the needed power in terms of amps. I want to know any document which talks about,
how to determine ...
2
votes
1answer
194 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
1k 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
6answers
3k 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
190 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
110 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
372 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
51 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
89 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
60 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
59 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
20 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
101 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. ...
8
votes
2answers
711 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
2answers
239 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
133 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 ...
1
vote
1answer
88 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
190 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
83 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 ...
0
votes
5answers
171 views
interference between redundant power supplies
I have a number of dell servers and two UPS. I plan to give two different input to servers from two different UPS, my question is:
A short circuit of redundant powersupply unit (PSU1) will trip one ...
1
vote
3answers
935 views
Power Usage via IPMI or BIOS or?
Is it possible to check the power usage of an entire machine via IPMI, BIOS, or any other option? I have done some searching but no results have came up yet.
PDUs only show the total usage, so this ...
1
vote
1answer
91 views
Power surge protection on office LAN, medium-small scale [closed]
I've got an office LAN setup with about 15 computers, which is due to expand to 30 before long. Each computer is on its own voltage stabilizer and UPS.
I live in a place with horrible, substandard, ...
3
votes
2answers
173 views
Wattage Per Square Feet as a Measurement
I am used to looking at collocation providers where in U.S. are given as AMPs per rack (assuming 120V). I am looking into a place that rents space for servers which is listed as:
"250 Watts per ...
5
votes
4answers
1k views
When do I need to consider 3 phase power? [closed]
Ok, I'm trying my best not to make this too subjective and provide all the information I can and if you can help make this a better question then please suggest.
My friend an I have a small software ...
4
votes
3answers
288 views
How to properly configure power redundancy for devices with only one power input?
Some devices, such as servers and high-end switches have dual PSUs/power inputs, which can then be hooked up to separate UPSes, which are hooked up to separate power circuits (correct so far, right?).
...
0
votes
1answer
166 views
Upgrading memory on an IBM Power 710 Express (8231-E2B)
We have a Power 710 Express server that was loaded with 4x4 GB memory on a single riser card. I have replaced the 4 chips with 4x8GB and put in another riser card and loaded it with 4x8GB more for a ...
0
votes
3answers
408 views
Rackspace - typical power for a server
I'm trying to get some rackspace and buy an appropriate server. I've got a quote for 1/4 cabinet which includes 0.5kw of power. How do I know how much power my server will use...(e.g. I've looked on ...
5
votes
1answer
148 views
Using Y split cables to connect two servers to a single PDU receptacle
We have bought a few 30amp 208v PDUs that only have 9 receptacles. The servers we are connecting to those PDUs will not use the full 30amps (at 80%, or actually 40% since we use redundant power) so we ...
12
votes
4answers
605 views
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 ...
8
votes
2answers
720 views
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 ...
-2
votes
1answer
40 views
Disks online through power pull, replace? [closed]
Suppose you had a server cabinet and the power was pulled on the whole thing (this just happened to us).
Now suppose you had a hard drive (3.5" SATA WD Enterprise) that was not previously in use. It ...
0
votes
1answer
156 views
APC switched PDU rack, lost state after reboot or power loss
I have the following:
We have a few APC 7920 PDU's
Using POWER IQ to control the PDS's via SNMP 1/2
Using also Mobile Power IQ to control the PDU if need via iPad/iPhone
I am in the process of ...
2
votes
2answers
1k views
Virtual machine lost after power cut
We have just had a power issue and our ESX (ESXi 4.1.0) host lost power and then rebooted. All but one of the virtual servers have rebooted with no problem, however one of them refused to power up.
I ...
7
votes
2answers
339 views
Green-IT: How do you deal with poweroff systems in your system monitoring?
Many of you probably have completed or are contemplating Green-IT projects with the goal to power off idle or unneeded systems when demand for computer resources is low:
How you did handle this ...
4
votes
2answers
519 views
Does unbalanced load on three-phase UPS use more power and cost more?
We have a three-phase online data center UPS.
Someone said recently that if the input amperage across the phases were 70-10-10 we'd pay for the kWh represented by 70 amps, but if the same load were ...
0
votes
0answers
333 views
IBM System x-3550 m2 won't start
I have a system x-3550 that won't start. It is in the process of being rebuilt as an Exchange server, so it wasn't in production yet, and while I was on leave it got turned off (properly I might add, ...
11
votes
5answers
614 views
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 ...
2
votes
3answers
773 views
How to measure server power consumption?
We have data center running more than 2000 servers. We are planning to shutdown the servers on a weekend for cost cutting purpose. How can we calculate which servers are consuming more power in the ...
0
votes
2answers
7k views
Windows 2008 Server R2 turns itself off
I have a Windows 2008 R2 Server that switchs off on his own. and it does not look like a hardware problem since I can see in the log how all services are stopped and after:
Log Name: System
...
