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

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210
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15answers
12k views

I've inherited a rat's nest of cabling. What now?

You know, you see pictures like below and sort of chuckle until you actually have to deal with it. I have just inherited something that looks like the picture below. The culture of the organization ...
54
votes
10answers
3k views

How to extinguish a small fire in a server rack to minimize damage to surrounding equipment?

Suppose I have a rack with several servers and other stuff. One of servers overheats severely and either starts smoking or catches fire while there's a serviceman nearby. If anything similar happens ...
48
votes
17answers
10k views

Do you skip a rack unit between servers?

It seems like there's a lot of disagreement in mindsets when it comes to installing rackmount servers. There have been threads discussing cable arms and other rackmount accessories, but I'm curious: ...
45
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 ...
44
votes
7answers
3k views

How to take full ownership of an IP address?

My business is... troublesome. What I do is legal in every country on earth, but some people don't like it, and make it so tough on my poor ISPs that I am forced to go looking for new providers more ...
44
votes
8answers
2k views

How is fire spread in server rooms and datacenters?

Every now and then I read that a severe fire has happened in some datacenter, lots of equipment has been damaged and customers have gone offline. Now I wonder what is there to support and spread fire? ...
44
votes
14answers
107k 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 ...
44
votes
4answers
76k views

Splunk is fantastically expensive: What are the alternatives? [duplicate]

Possible Duplicate: Alternatives to Splunk? This has been discussed, but it has been several months, so it may be time to revisit it: Earlier discussion RE Splunk alternatives For the ...
41
votes
7answers
7k views

Why do we still use power supplies on datacenter servers?

Computers mainly need three voltages to work : +12V, +5V and +3,3V, all of them are DC. Why can't we just have a few (for redundancy) big power supply providing these three voltages to the entire ...
40
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? ...
35
votes
34answers
38k views

Monitoring server room temperature

I have a small server room with its own AC unit. Recently, the AC died, and the temperature increased from 70 F to > 90 F. We rarely go in this room, so I was lucky that someone happened to notice ...
29
votes
3answers
3k views

Illegal activities prevention system (child pornography, animal cruelty, …)

It is a very sensitive topic that requires a solution from our end. I have few servers that I rent to few people. I have all legal permissions and rights to scan over the servers. I want to prevent ...
24
votes
1answer
596 views

Zinc Whiskers in Data Centers

A message thread on this site from 2010 through an update in 2012 was on a server room that was closed due to zinc whiskers and they thought the flaking was from access flooring & its support. I ...
23
votes
6answers
5k views

Best practices for power cabling racks in DC

With network cables it is easy. I use velcro-ties, coloured cables, 0U vertical cable organizers from APC on side of the rack -- easy and neat. However with power cables it was always giving me ...
21
votes
16answers
1k views

How have you saved green by going green?

For the purpose of this question, I am interested in server/datacenter related hardware. Have you had any measureable amount of ROI by swapping existing hardware to more "green" or energy efficient ...
20
votes
4answers
967 views

What to look for in a datacentre ethernet switch

This is a Canonical Question about choosing a network switch for a datacentre When shopping for a networking switch that's going to be going into the top of a datacentre rack, what specific ...
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 ...
17
votes
13answers
2k views

Physical server security

A lot of time and columns are spent discussing securing a server from outside attacks. This is perfectly valid because it's easier for an attacker to use the Internet to break your server than it is ...
16
votes
1answer
1k views

How to correctly move a server inside a rack up and down

Maybe a bit stupid question, but Sometimes (rarely but it happens) I need to move a server in a rack 1-2U up or down. What do you think, which of the ways is the most correct and useful and why? ...
15
votes
5answers
835 views

What is meant when IT Infrastructure people refer to the “Stack”

Can someone please define what exactly is the "Stack". I know its an industry term but its very vague. I am referring to Infrastructure terminology not "Stack" in terms of memory allocation.
15
votes
2answers
363 views

What are the different classes of Internet Connection and how do they differ?

I'm looking for the technical differences between consumer and professional Internet connections. By "professional" I mean: The kind you can get at a datacenter The kind you can get at an office ...
14
votes
7answers
1k views

Why are datacenters built over a wide area instead of using taller buildings?

I've seen a lot of datacenters pictures and it seems that the owners prefer to build them over a wide area instead of building them using taller buildings. Why?
13
votes
10answers
5k 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 ...
13
votes
2answers
15k 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, ...
12
votes
6answers
6k views

free tool for datacenter documentation [closed]

Is there any free tools out there that can help to better document at datacenter, for information like servers in a rack, the group port it is connected to and etc?
12
votes
1answer
1k views

What Data Center room routine maintenance tasks should be done?

Beyond the work done "inside" equipment (administration, programming, network config) there exists physical equipment and rooms. This physical room equipment needs care and feeding as well on a ...
11
votes
5answers
3k views

How do you deal with server noise? Hearing loss?

So we all work on servers, and some of us work around them as well. The sound is annoying and bad for our hearing. I wear earplugs when in the datacenter or earbuds which act kind of like earplugs ...
11
votes
7answers
9k 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 ...
11
votes
1answer
2k views

What is the proper way to manage cabling behind patch panels?

I have a 4-post 19" rack with a 72-port 2U quickport patch panel where horizontal structured cabling terminates. The cables are bundled and enter the rack at the rear. From the back of the rack, ...
11
votes
2answers
1k views

Using 48v for servers

I'm currently in the middle of a process to specify and design a new server environment for graphics and video rendering. We know we want to use blades, and we're pretty sure of our vendor decisions. ...
10
votes
4answers
1k views

How common are dropped packets in communications within a data center?

Let's say I have 2 machines in the same data center but not necessarily in the same rack. How common would dropped packets be when sent using UDP between these two machines? I'm asking under the ...
9
votes
2answers
2k views

How can you predict the amount of cooling needed for a particular piece of equipment?

Every summer we have to shut down some equipment due to a combination of outside temperature and high load. The air conditioners just can't keep up. As we cycle in new equipment and cycle out old, ...
9
votes
1answer
250 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 ...
8
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?
8
votes
3answers
964 views

RedStation.com is heaven for ddos attackers, How to file complaint? [closed]

Sorry, I don't know where to open this subject. This is not the first time we have faced with a massive DDOS attack from one of servers in RedStation.com and even after we had contacted with their ...
8
votes
2answers
248 views

“Zinc Whisker” issues?

Good morning; We've been having intermittent power supplies failures in our data center that have been preliminarily attributed to "zinc whiskers". I'm just starting to read about them (I just ...
7
votes
6answers
1k views

DHCP for data center

Can someone provide cons and pros for having DHCP in a data center? I know this is usually a taboo, but maybe there were developments which alleviate the said issues? Thanks.
7
votes
6answers
742 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 ...
7
votes
3answers
2k views

How to correctly run cables on servers in a data center?

I've read about a few key points, e.g. run all ethernet cables on the right side, all power on the left side, but if possible I'd like to know what you guys do from experience? For example, how do you ...
7
votes
3answers
594 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 ...
7
votes
3answers
323 views

DataCenter Certification

What kind of acceditations exist for a datacenter? I am not asking about process accreditation. Not ITIL, not ISO 20000. I am asking about an accreditation for the datacenter itself. As far as I can ...
7
votes
3answers
13k views

What does “cross connect” means in Datacenters?

I have been doing some research on Datacenters and this is one of term that i have yet to wrap my mind around. I would appreciate if someone in the field could explain in simple terms what exactly ...
7
votes
2answers
4k views

How to step down voltage from 208V to 110V

I have some racks that will be fed by 208V/20A circuits. These circuits will be conditioned and battery-backed by the facility in which these racks will live. 99% of the devices in the rack will be ...
7
votes
3answers
4k views

Layer 4 vs Layer 7 Load Balancing

I am trying to decide between using a layer 4 load balancing solution for my datacenter or a layer 7 solution. Unfortunately (for my sanity, that is), my use case is simple enough that both solutions ...
7
votes
4answers
714 views

External load balancer solutions between EC2 and Rackspace

I have a website primarily hosted on EC2 with the backends (MySql) replicated async to a Rackspace store. I am also planning to have a suite of web server, cache & db on standby at Rackspace in ...
6
votes
10answers
16k views

Rack layout tools

I'm wondering if there's any tools (preferably offline) that would allow me to layout all of the new equipment that will be going into several standard racks. Currently I'm using Excel to map out all ...
6
votes
6answers
296 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 ...
6
votes
5answers
397 views

NOC Situational Awareness

In our NOC, we maintain situational awareness of all physical security zones (reactive video feeds), some basic information about the physical characteristics of the data centers, the weather and a ...
6
votes
6answers
617 views

Data Center Design and Preferences

When either selecting a data center as a co-location facility or designing a new one from scratch, what would your ideal specification be? Fundamentally, diversified power sources, multiple ISPs, ...
6
votes
3answers
974 views

Prevent being locked out when configuring SSH and iptables [duplicate]

When you are configuring iptables or SSH over SSH and the data center is thousands of kilometers away (and getting someone there to plug in a KVM is hard), what are some standard practices to prevent ...