Tagged Questions

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

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4
votes
7answers
2k views

Safe File System for Power Failure?

Has a file system been developed that is completely safe from power failure based corruption? If we assume critical data is being stored without a UPS and performance is irrelevant, does file system ...
7
votes
6answers
6k views

Which is better - 30 AMP 220V circuit or 60 AMP 120V circuit

I'm looking for advice on which electrical service I should have run to a rack that I have in a data center. The price is the same for either a 30 AMP 220V circuit or a 60 AMP 120V curcuit. I ...
3
votes
5answers
612 views

Will Power Edge Servers and Cisco Routers Power on when given power?

This post mentioned that servers can be powered on when given power (useful for remote power up by PDU). Does anyone know if Dell PowerEdge servers have this options (particularly 2950 and 2850s). ...
6
votes
6answers
295 views

Things to consider when buying PDUs

I am thinking about getting new PDUs for my racks. I would like ones that are: Metered (Maybe remote monitored) Vertical Meet my power requirements (Voltage and amperage) Right number of outlets ...
4
votes
3answers
861 views

Second (Redundant) Power Supply for a Cisco 3825 Router

Does anyone know if I can purchase a second power supply that goes in a Cisco 3825 router, or is there a separate unit I get for this? Right now it just the single power supply, and I want to get ...
30
votes
9answers
16k views

Does CPU power management affect server performance?

I was doing some simple hand benchmarking on our (live) database server during non-peak hours, and I noticed that queries returned somewhat erratic benchmark results. I had enabled the "Balanced" ...
0
votes
1answer
658 views

What Video card can be added to a DL380 G5

I would like to add a modern video card to a 2nd hand DL380 G5 so I can have full colour and dual LCD panels in native resolution. Server has onboard ATI ES1000 video chip. The PCI expansion/riser ...
6
votes
6answers
524 views

Securing power cables

It's always annoyed me that while the sockets for network, serial, parallel and display cables all have securing mechanisms (ie a screw-in bolt, or a clasp) to stop them from being pulled out by ...
2
votes
1answer
6k views

Remote shutdown of Dell PowerVault MD3000

It's heating up down here (Australia) and we always have power issues over the summer at one of our sites. We have a reasonable UPS with massive batteries and run an agent on our Servers that shuts ...
0
votes
4answers
243 views

Power switch when turned off will remotely turn off another switch? [closed]

Just wondering if there is any hardware device that when it loses power, will send a remote signal to another power switch to turn off? This is more for media equipment, but I figured if anybody knew ...
5
votes
3answers
702 views

Calculating how Much Power is needed For Servers

How do I calculate how much power I need for my servers / switches / routers? This is needed when moving into a datacenter. I figure I should just add up the wattage on all the power supplies even ...
7
votes
7answers
10k views

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?
5
votes
2answers
170 views

Power on machine when there is power?

Is there a solution for powering a machine back on after power loss once the power is back on? I could use wake-on-lan, but if there is a solution (software or hardware) to automatically power-up once ...
9
votes
1answer
299 views

Sysadmin in the Developing World: What are the differences between various kinds of power protection?

Hello I'm an ICT (InfoComTech) US Peace Corps volunteer deep in Tanzania who has the task of managing and advising concerning our college's two SunFire Sun Ray Servers and Dell Proxy server (on 2 ...
1
vote
1answer
86 views

Plugstrips with protected switches

We recently had a full power outage and had to shut down basically all devices in the server room. Being a smaller org, we still have some very small business practices im working to change over ...
5
votes
2answers
374 views

Understanding colo pricing with respect to power needs

I run a small shared web hosting company and rent all my servers. I periodically consider switching to colocating my own boxen and inevitably get stuck understanding how much it may cost. As far as ...
6
votes
6answers
2k views

Where to locate power outlets on server rack?

I'm building a new server room, and have to decide where I'll be locating the power outlets (120V 30AMP locking connectors) that my UPSs will be powered from. In the past I've put the outlets on the ...
6
votes
7answers
1k views

Is there a solution against short power outages except UPS?

I encounter very short power outages quite often. Typically they last for just couple of seconds - perhaps the power grid maintenance staff just flips the switch to "Off" and then immediately to "On". ...
7
votes
7answers
398 views

What less obvious ways are there to misuse and damage a UPS?

I've never had an uninterruptible power supply and think of buying one. What not-so-obvious things should I not do to the UPS so that it lives longer? I don't mean some obvious abuse like ...
12
votes
12answers
25k views

What is the lifespan of an typical UPS battery?

When using a uninterruptible power supply how long does it preserve the original capacity? Say I buy a UPS that holds the necessary load for 10 minutes - I don't want it to unexpectedly come into ...
28
votes
9answers
13k views

UPS and power strip interactions?

Sometimes I hear that you shouldn't plug (UPS brand X / any UPS) into (power strip brand X / any power strip) because of some interaction leading to poorly conditioned power, reduced battery life, ...
18
votes
7answers
662 views

Power loss at company

Property management at my organization has informed me that our building will be losing power for 4 hours tomorrow. I need to be prepared for this event (we're a small organization, i'm young, ...
5
votes
7answers
844 views

Rackmount Power: NEMA 5 or IEC C14?

Here in the USA, most consumer power strips seem to make use of NEMA 5-20R connectors - they look something like this. However, in the rackmount/datacenter world, I see a lot of power distribution ...
3
votes
5answers
2k views

How can I troubleshoot a broken on/off switch?

I have a file server that was recently relocated in a transoceanic move. It isn't under warranty, as it was a custom-built in-house tower. When I hooked everything up and tried to boot it, the system ...
9
votes
6answers
2k views

Laptop waking from sleep

I have a laptop which has "recently" turned into the proverbial baby, and refuses to sleep through the night, or for that matter, through some days. I'm a little lost when it comes to trying to debug ...
4
votes
3answers
2k views

Manage USB hard disk on Ubuntu

I have some USB drives attached to my Ubuntu machine, I was looking for some commands to: Power-Off a drive after umounting it. Power-On and Re-Mount. Does it make sense to power-off and on a USB ...
51
votes
14answers
2k views

Is UPS worthwhile for non-production equipment? [closed]

Over the years, I've had to throw away a quite a few bits of computing equipment (and the like): Several ADSL routers with odd symptoms (losing wireless connections, losing wired connections, DHCP ...