is a facility used to house computer systems and associated components, such as telecommunications and storage systems

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1
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2answers
46 views

Server utilization and how to deal with datacenter failure

New technologies like Docker, Mesos, Kubernetes etc. allow much better server utilisation in an organisation. However, I'd like to know how utilisation can be maximised across two datacenters, taking ...
48
votes
14answers
133k views

What is the correct temperature for a server room?

When I was working in our server room, I noticed that it was very cold. I know that the server room has to be cold to offset the heat of the servers, but perhaps it is TOO cold. What is an ...
1
vote
0answers
17 views

What technology do data center use to guarantee low RTT?

I was reading about data-center-tcp DCTCP and the paper was talking about the low retransmission timer (RTT) of about 250┬Ás, but didn't state how that is being done. Somewhere else I read that DCTCP ...
13
votes
11answers
7k views

Why datacenter water cooling is not widespread?

From what I read and hear about datacenters, there are not too many server rooms which use water cooling, and none of the largerst datacenters use water cooling (correct me if I'm wrong). Also, it's ...
0
votes
1answer
36 views

Can CHEF have different databags in different datacenters

Chef 12 has the notion of organizations, and environments. How would you logically model different data centers? For example, if you have two data centers, with 2 environments. us-datacenter ...
-2
votes
1answer
40 views

Servers in different DC's - performance impact

Today Linode eat my nerves completely by shutting down main DB server for 25 minutes due to their internal network problems. Right today I was going to set up another one server at linode to set up ...
0
votes
0answers
58 views

HDFS performances on apache spark

I have several issues related to HDFS, that may have different roots. I'm posting as much information as I can, with the hope that I can get your opinion on at least some of them. Basically the cases ...
1
vote
0answers
83 views

Setting up a caching system r/w in DCs across continents

We are going to implement a caching system to make our front-end servers which are located in different data centres in Asia, America and Europe can read and write some small JSON data in the shortest ...
2
votes
1answer
26 views

Apache Spark infrastructure - combining compute and storage nodes

I have an infrastructure question around Apache Spark, which I'm looking at rolling out in a greenfield project with (at most) approximately 4 TB of data used for modelling at any given time. ...
45
votes
7answers
5k views

Cable Management Policy

We've all seen good and bad examples of cable management. What are objective, measurable requirements that can be used in a policy to maintain cabling order in the rack/server room/data center? ...
-1
votes
1answer
116 views

I have a firewall that supports 1Gbit ethernet ports but 1.4Gbit of traffic, can I make use of a 10Gbit pipe from the router in this case?

We're putting up a rack of servers in a datacenter which provides us either a 1Gbit pipe or 10Gbit pipe from the router (our choice, our package includes 10Gbit). But if we have a firewall which ...
9
votes
4answers
888 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? ...
3
votes
3answers
1k views

How many power circuits do I have in a rack?

I'm planning to get some colocation space from someone in my area, and like most companies that offer colocation, ask about power supplies (of course) in the quote form. I'll need a power of 1000W ...
2
votes
1answer
80 views

Zero-U PDU preferred mount location

Looking for some experience from the field - The rack I manage has two zero-U vertical PDU's supplied by the datacenter. They have fitted one on each side (one on the left, one on the right). The ...
13
votes
2answers
12k views

How to manage a global VM startup order across the whole datacenter?

Suppose you have a fully virtualized VMware infrastructure: ESXi, vCenter, vMotion, HA, DRS, the whole package. Inside, you have lots of VMs, which at any given time may reside on one host or another ...
44
votes
6answers
27k views

What's the best fire suppression for a server room? [closed]

What is the state of the art in fire suppression for server rooms? What are the top priorities in choosing a good system?
4
votes
2answers
345 views

What photograph technology is appropriate for site/datacenter documentation?

I manage 500+ sites and need a better visual way of documenting and walking people through a given datacenter. I'm considering taking several (hundred) pictures and stitching them together so that I ...
4
votes
0answers
79 views

Why would you internally use NAT? [closed]

I work at a fairly huge company as a software engineer and I would like to understand why an enterprise would internally use NAT. We have several data centers, somewhat geographically close to each ...
2
votes
2answers
101 views

How do you ensure that two data network links have no SPOF?

How do you ensure that two data network links have no SPOF (Single Point of Failure)? We are working on a datacenter network connectivity and need to ensure that there will be no SPOF. We will have ...
2
votes
5answers
612 views

Set up layer 2 vlan between 2 data centres

Our data centre provider operates 2 sites, and we currently have equipment in one and would like to have equipment in the second. They've told me that they operate a layer 2 vlan between the 2 sites ...
17
votes
8answers
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
2answers
236 views

Sealing Tiles and Cable routes in datacenter fire supression

I've been given the task of moving a small datacenter (3 Racks) into a new building where a server room was built with water sprinklers. The issue was raised and the contractor changed it to an FM200 ...
13
votes
2answers
17k views

Ideal humidity for a server room?

Most equipment is rated for a wide range of humidity (5 to 95% non-condensing, for instance). However, what is the ideal humidity? Higher humidity carries heat away from equipment a little better, ...
2
votes
2answers
732 views

Ethernet full duplexity and collision confusion!

Folks, I am having a tough time figuring this out: in a full-duplex LAN segment are there any collisions to be taken care of when (i) There are only two stations connected point to point (ii) When ...
10
votes
1answer
295 views

Standard Bolt Pattern for Racks in Datacenters

Is there a "standard" way of bolting racks down that is interchangeable between vendors? At our datacenter we've standardized on a Damac rack for our builds. Because we're building in volume, the ...
4
votes
7answers
484 views

What's the benefit of using “containers” in the datacenter as opposite to regular installation

I have just seen this video: Google container data center tour What is not quite clear to me is, what's the benefit from placing the servers inside containers?
7
votes
6answers
826 views

Rack layout for future growth

We're getting ready to move to a new colo facility and I'm designing the rack layout. While we have a full rack, we only have 12U worth of hardware right now: 1x 1U switch 7x 1U servers 1x 2U server ...
9
votes
15answers
3k views

Best floor of a tall building to locate your server room or data center [closed]

What reasons would you give for locating data centre in the basement instead of a upper floors?
-4
votes
2answers
131 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 ...
4
votes
2answers
351 views

How to simulate air flow in a datacenter? [closed]

I have an idea for a datacenter architecture which, I believe, would be very effective in terms of passive cooling. I need to do air flow simulations to be sure that the idea is as great as I ...
5
votes
2answers
846 views

Headset for phone calls in the datacenter

Datacenters are noisy places. On occasion it is necessary for an administrator or technician to troubleshoot a problem in the datacenter while on a phone call or conference call. Unfortunately, ...
3
votes
0answers
282 views

Datacenter Inventory Management [closed]

In our environment the following is true: Every resource (think server, switch, pdu etc) is mapped to a specific device identifier in a database The problems are: Not every device which exists in ...
1
vote
2answers
305 views

How to measure power usage effectiveness (PUE)

As part of a sustainability project I have been requested to measure the PUE of our server room. We have gross power usage figures from the UPS (and seperate supply meters) but nothing else. How in a ...
1
vote
1answer
135 views

Whitebox firewall in datacenter environment

I am looking into alternatives to commercial firewall appliances. Most of the resources available online describe home network firewalls or sub-gigabit networks. Considering than 10GbE is becoming the ...
6
votes
4answers
2k views

Open source DCIM stack?

Our 500-server data center is growing quickly and my manager has started investigating using a specialized Data Center Infrastructure Management (DCIM) package to help manage constraints. DCIM ...
4
votes
1answer
300 views

Receiving Cable/Satellite Television in Colo?

I am running analysis over many live TV channels (both broadcast and cable networks). Currently I have an office setup with couple of DISH receivers hooked up to HDMI capture cards in a machine ...
1
vote
0answers
63 views

Bridging two datacenters

i need to find out what would be best way to bridge current datecenter with new DR datacenter. I have following network configuration (show in picture). http://i.imgur.com/7bohb3I.jpg So on internal ...
1
vote
1answer
69 views

High peak power demands in datacenter; lower costs? [closed]

Short version A UPS seems to have only two modes: Supply all power from the input feed Supply all power from the internal batteries (when the input feed is gone) Can a UPS also be used to balance ...
25
votes
3answers
4k views

How do servers with redundant power supplies balance consumption?

I have several servers from the HP DL360 line (generations 5-8). Each of these servers has two power supplies installed. The 2 power supplies in each server are fed from different circuits. My ...
14
votes
8answers
12k views

Avoiding DNS timeouts when a dns server fails

We have a small datacenter with about a hundred hosts pointing to 3 internal dns servers (bind 9). Our problem comes when one of the internal dns servers becomes unavailable. At that point all the ...
5
votes
3answers
190 views

What is an acceptable secure time source in a datacentre environment?

GPS and NTP are two very typical time sources when accurate clocks are required. However, each has an important failing. NTP does not provide authentication of the time source, and so may be ...
4
votes
1answer
97 views

Monitoring Datacenter Voltage Spikes

We have reason to believe that were getting voltage spikes in our infrastructure. Demonstrated by our remote power controllers receiving over voltages on their regulator pins causing them to fail. ...
14
votes
1answer
203 views

Share /home between datacenters

I have two servers, placed at datacenters in holland and france. Both are running Debian Wheezy. I need to share /home between them, with good performance. There are 300-something users on the ...
-3
votes
1answer
79 views

The Backup Paradox [closed]

I have been thinking about how large companies backup their data. I imagine that in some critical enterprises they must consider every possibility and can't afford to lose even one bit of data. Of ...
4
votes
1answer
270 views

Batch configure HP ILO from laptop

I need a method of setting over a thousand Ilo's on our HP DL360p Gen 8 servers (With hundreds more on the way!) Our environment doesn't allow for the use of any automatically assigned address such ...
46
votes
3answers
2k views

Assessing equipment damage following a lightning strike - Should I have planned more?

One of my client's sites received a direct lightning hit last week (coincidentally on Friday the 13th!). I was remote to the site, but working with someone onsite, I discovered a strange pattern of ...
3
votes
3answers
704 views

How is a private data center more secure than a public cloud?

I have customers in the financial services industry that insist that a SaaS hosted on public clouds like Amazon's are not as secure as colocation in a private data center. However, I can't find ...
-4
votes
1answer
84 views

Any app to manage a servers and remote console? [closed]

I can't find a software to manage servers, connect to remote console, reboot, power cycle, see temperatures etc, only if I enter by the management IP and one by one server. iDRAC, iLO are also part ...
0
votes
0answers
63 views

Do some network administrators assign MAC addresses with an unassigned OUI?

I am in a situation where I have observed MAC addresses on a network that do not belong to any assigned OUI range, and this is causing some issues. I suspect the cause here is a heavy use of ...
-1
votes
1answer
49 views

Rapid failover from one data center to another when the first goes down?

I'm building a global CDN and have a DNS service that will direct customers to the closest server. However I need rapid failover if one of the data centers e.g. Germany goes down users need to be ...