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

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23 views

ElasticSearch enforce master shard allocation & Improve cross DC write speed

I currently run three Elasticsearch nodes. Each one in a different data center (EU, US, AP) as an AWS EC2 instance. There are 2 replicas per each shard for each index. Writes go only to the EU node. ...
0
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0answers
14 views

Detect changes of VM parameters

We run VMs in remote data centers. We are responsible for the VM, but not for the hypervisor. We want to detect changes in the resources of the VM. Example: VM has 10GByte memory - everything is ...
0
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1answer
12 views

Can data center remote hands service install new network card?

Long story short: I'm co-locating a standard server box in a data center in a faraway foreign country. I need to install a specialized network card that isn't sold or included by the OEM. I'd like to ...
0
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2answers
32 views

How to connect a Juniper EX4500 to netapp X1107A

What is the best and not expensive way to connect a Juniper EX4500 to a X1107A Chelsio PCI Netapp card? Will these do (10GBASE-SR) for both end? and then connect with fiber cable? How important is it ...
0
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2answers
82 views

Is it really that easy to move this network?

I am just wondering if maybe I am over simplifying things here. I have a network housed in one data center in Seattle. We will be moving out of that data center this weekend. For the sake of keeping ...
-1
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2answers
37 views

Fallback between datacenters

What is the best way to do a fallback between datacenters. We have a dedicated server in one of the data centers and as our traffic increased i wanted to add more then backup i wanted redundancy and ...
1
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0answers
17 views

How do I use Client9's IPCat with IPTables

I'd like to block all ips of all datacenters in the world with this list: https://github.com/client9/ipcat But I don't know how to use that list, I'd like a bash script that checks if there's an ...
3
votes
3answers
448 views

Purpose of vent holes on the top of rackmount servers?

Edit: Because of the high number of downvotes on this question, I would appreciate if you could comment on why you think the question deserves so. I believe the question is clearly asking for the ...
1
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1answer
14 views

Methods for monitoring and alerting data issues when dealing with complex dependencies

In this hypothetical example, we have a data flow across multiple engineering teams in an ecommerce company. These teams deliver services, produce data, and consume data at different points of the ...
1
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0answers
30 views

Does an Intel server with RMM4 (IPMI BMC) need two IP addresses/cables?

I am managing a co-located server which has been rebooted and has not turned back on. It is in a data center and difficult to access, as such I am looking at Intel's RMM4 (compatible with the server ...
0
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0answers
33 views

SYBASE Connection slow to data center

My team and I are in the midst of migrating some of our servers to a new data center (we are connected via MPLS). I'm testing the first of our dev servers and am running into an issue. This server (...
0
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2answers
133 views

Switch in front of router - multiple public IPs

Network Gurus, This seems logical and doable but want to have an advice from experts. We have /26 on single drop in our datacenter. Some of our application servers (A) need public IP addresses and ...
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votes
1answer
69 views

How long a latest rack server in data center takes to boot? [closed]

For an short/simple experiments, I need to know how long a latest rack server Xen/Vmware hypervisor installed with its utilities takes time to boot up (cold boot)? In our lab we do not have rack ...
1
vote
1answer
43 views

HDD seq. read performance

I read the specs for one of the latest Hitachi HDD, https://www.hgst.com/sites/default/files/resources/USC10K1800_ds.pdf . It indicates a speed of SAS 12 Gb/s which is 1.5 GB/s. Is it the sequential ...
1
vote
2answers
70 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 ...
1
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0answers
28 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 250µs, but didn't state how that is being done. Somewhere else I read that DCTCP ...
-2
votes
1answer
55 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 ...
1
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0answers
556 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
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0answers
91 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 ...
0
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2answers
113 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
154 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. ...
4
votes
0answers
82 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 ...
3
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2answers
353 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 ...
1
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1answer
247 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 ...
1
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0answers
85 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
99 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 ...
2
votes
1answer
250 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 ...
28
votes
3answers
10k 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 ...
4
votes
1answer
227 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
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1answer
317 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 servers,...
-3
votes
1answer
80 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
506 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 ...
3
votes
3answers
801 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
92 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 ...
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0answers
93 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
76 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 ...
1
vote
1answer
593 views

Running CoreOS across multiple data centers -howto?

I'd like to use CoreOS as my base OS going forward. I run a lot of apps in multiple data centers, and I fully believe that I should containerize the lot. This has thrown up a lot of questions, ...
2
votes
1answer
62 views

Is there a better way than VPN tunnels to access local tools in remote DCs?

I have created a fancy interface which pretends to be an unified interface to access to different local tools located inside different datacenters. These tools are not accesible from the outside. To ...
5
votes
3answers
246 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
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 ...
0
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2answers
47 views

Migrating to a Data Centre

I am a software developer. My company is planning to take advantage of visualization and host its servers at a data center. I understand the difference between the cloud and self hosting at a data ...
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 ...
4
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0answers
407 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
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2answers
78 views

ip recognition is different

some months ago i bought a dedicated server from usa (http://www.dacentec.com/) datacenter. my ips are look like this : 162.248.243.blo blo blo when i check my ip in this site : http://...
7
votes
3answers
2k 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 ...
47
votes
7answers
8k 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 ...
-1
votes
2answers
688 views

Upgrade existing Windows 2012 Datacenter to Windows 2012 Datacenter R2 [closed]

I am currently using Windows 2012 Datacenter and I would like to upgrade it to the Datacenter 2012 R2 version. Is the upgrade free from Microsoft? Or do I have to buy either an upgrade version or a ...
0
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1answer
212 views

What are the benefits of having a data center located geographically far away from your customer's office? [closed]

Was just reading through an article on data centers as linked: http://www.theage.com.au/it-pro/business-it/what-to-look-for-in-a-data-centre-20131122-hv3qj.html Appropriate quote from article below: ...
5
votes
1answer
145 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. ...
2
votes
1answer
47 views

Confused about horizontal scalling

Please correct me if I am wrong but I guess handling more requests and load by adding more machines or balancing the load between multiple servers is horizontal scalling. So, if I add more servers, ...