Developers Club geek daily blog

"A countdown simple means – or the rule "3-2-1" for disk storages"

1 year, 5 months ago
All hello, dear readers!

Very long ago I did not write on Habré – both time was not, and thoughts it was not dense too … But thoughts is a dynamic flow if is that "on an input" — that will appear also "output". And here, watching tendencies in IT, having looked around, thoughts ripened: all of us, infrastrukturshchik, slowly and truly slide in Software Defined Computing, i.e. the paradigm of proprietary iron is replaced by software solutions over conventional components. We have SDN (Software Defined Networking), SDS (Software Defined Storage), and SDC is in fact abstraction based on a hypervisor or containerization …

Today I would like to mention solutions in the field of SDS – and already out of limits of solutions of Microsoft, I wanted to look at third-party partner solutions and to look whether there is life there in general … At once I will pay your attention that I will lead the narration about Windows world, on an old habit and bigger competence, than red-eye story … (smile)
The first that came to my mind - it is StarWind. I well remember software solutions of StarWind since Windows Server 2003 (-a kingdom to it binary), then it was the easy and effective way to make inexpensive block storage from the simple server with hard drives, but not to stir up-buy expensive SHD … Everything flows, everything changes – one river not to enter twice. Such functionality appeared also in Windows Server and now an era of clouds outside over time, and the cloud always stretches and stretches over infrastructure – and I remembered about StarWind, I think: "a dayka I will look, can at them is what interesting?." And I did not lose, the solution interesting really is also a name to it StarWind Virtual SAN.

Read more »


ACS: from grief to pleasure. History of the Russian automation

1 year, 5 months ago
Modern developers of systems of automation have rich opportunities: these are numerous programming languages, libraries, huge repositories of the open code, at last, any equipment rather available practically necessary for development and testing. In the 50th years when in the USSR the idea of creation of an ACS and the beginning actively arose to develop cybernetics, all these resources were not enough. Scientists of that time were not only dry pragmatists, but also dreamers — they wanted positive changes of the socioeconomic relations which the ACS was urged to provide. However all further history of creation of an automated control system within command economy and infinite bureaucracy is not so optimistical. But about everything one after another.

Read more »


As the command of engineers of Airbnb "broke" the main DB of the project for few weeks

1 year, 5 months ago
Note of the translator: On Habré and in ours told about scaling of Apache Storm in Spotify, creation of 20-and 30-gigabit connections on the Ethernet networks command of the project 45 Drives, and today it will be a question of how engineers of Aribnb were engaged in splitting the basis for data of the project.



Every year the traffic of Airbnb grows 3,5 times quicker, and its peak falls on the summer period

This year in anticipation of a summer season of travel the command on service of infrastructure of Airbnb worked over scaling of our databases hard. It was necessary for the company it will be prepared for summer peaks of loading.

Splitting certain tables into sections (partition) according to the functions executed by them and their room in separate databases was the purpose of one especially important project. This project, for certain, would demand large technical attachments, including modification at the level of applications, data transfer and full testing which would guarantee integrity of data and the minimum idle time.

Read more »


Management of temperature in a data-center: why sometimes it is possible more hotly

1 year, 5 months ago


In our blog on Habré we tell about development of the cloud service 1cloud, and also we consider interesting questions of development of technologies and work with infrastructure. The question of ensuring cooling of DPC also belongs to the last subject. The group of scientists of Toronto University published research of a method at which temperature in a data-center specially increases. We present to yours highlights of this work.

For quite some time now the considerable part of the consumed electric power and emissions of carbon is the share of data-centers. Huge capacities are spent for their cooling, as was the main motivator for carrying out research work in the field of temperature management. The fact that up to the end it is not clear at what level it is necessary to maintain temperature in data-centers is interesting.

The majority of the companies sets temperature recommended by suppliers of the used equipment, however is not clear how its increase affects operability of systems. At the same time, according to results of the conducted researches, temperature increase by only 1 degree can reduce energy consumption by 2-5%.

Read more »


The lost art of the proof of security. Part of 1 of 2

1 year, 5 months ago
Pashkov Yury, Pashkov KuzmaLead InfoSec, EMC, VMWare trainer @ training.muk.ua

Long-term experience of teaching in the Information security direction (further IB) allows to state positive tendencies in this area:

  • Owners of business, at last, began to consider risks as so significant IB as financial and operational, and even more often look for not only the entrusted, but qualified advisers at a position of the CSO level (Chief Security Officer)
  • Normative approach to creation of systems of protection allowed IB to become in large quantities the consumed service
  • Explosive growth of risks of IB supports steadily great demand and the sentence in the market of services of training in the corresponding direction


In time it is available also negative:

  • It is also difficult to confirm the qualification in IB today, in particular if successful experience is got in the CIS countries, and the potential employer is in USA \Europe
  • Mass character leads to IB konsyyumerization problem
  • Quality of services of training and skill level of specialists falls


As a result there is whole staff of divisions of providing IB from which on all hierarchy levels, since a security administrator and graduating from the head, thoughtlessly fulfill requirements of standards of safety, without thinking of the proof of security of an automated system after their execution.

This article shows possibilities of evidential approach for creation of the protected automated systems and has educational character.

Read more »


Robot seller. We automate sales department by means of SaaS

1 year, 5 months ago
December is always busy season for sales departments, a such battlefield for revenue. During an era of ShPD and clouds automation of business stopped being destiny of the large companies, now different CRM, IP-ATS and thin clients are available practically to all. We as the developer of a cloud communication framework, would like to share how we automated own sales and what tools use. Our experience is not unique at all, rather we it is slightly better than others we understand as well as what is best of all on friendly terms and integrated from our virtual automatic telephone exchange and how to create peculiar cloudy Robota-Prodavtsa.


Read more »


Responsibility of vendor. Who is responsible for accidents?

1 year, 5 months ago
Last Thursday our service endured the largest accident in the history. One of installations on M9 remained unavailable of an external network within several hours. What happened? What to do? How the responsible vendor has to arrive? How to save reputation of vendor of a telephone platform No. 1?

It is considered that in time the corrected error is not an error any more. That, we will check correctness of an aphorism in practice. Usually marketing specialists write the plan of publications for the month ahead and the ideology of each post is something like motivating "Quicker, above, is stronger". Also we not the exception is so accepted, but this time we will depart from marketing dogmas and we will fairly tell about the appeared problem without the rustling New Year's Eve PR wrappers.


Read more »


Infrastructure of a social network: As the data-center of Facebook is arranged

1 year, 5 months ago


In our blog we write about creation of a cloud service underground and floating data-centers much. Also we told about own DPC of the imgix photoservice, and today we will turn a view of one of data-centers of Facebook. The journalist of the The Atlantic edition Ingrid Berrington visited one of data-centers of the largest world Facebook social network in the State of Iowa and shared impressions in the note. Here what interesting she saw and removed by means of the drone on object of the company of Mark Zuckerberg.

Read more »


Server "second-hand" as crisis response solution

1 year, 5 months ago
In hard times many companies look for methods to save. And here excellent option can become / u-oborudovaniye, including servers. They are much cheaper new and at the same time are not less reliable. So why to pay more?

Server market: take-off and falling


And what occurs in the Russian server market? To understand tendencies, it is worth going deep into history a little. In 2008 growth of the server market in the Russian Federation, according to analysts of IDC, made 18%. Demand for these products among the small and medium enterprises increases, transition from the Russian equipment to products of the leading foreign vendors is observed.


Read more »


Separate storage of medical data and regional information systems

1 year, 5 months ago


Few months ago we wrote about a perspective of storage of results of medical diagnostics. Let's continue discussion of this subject, and we will talk about need of separate (produktonezavisimy) storage of medical data, and on regional information systems.

Read more »