Developers Club geek daily blog

Get acquainted in more detail: multimedia gateway AudioCodes

1 year, 5 months ago
Good afternoon.

In this article we will begin session of several online lectures and articles on a separate line of the equipment AudioCodes – universal multimedia gateways which it is positioned for natural persons and small business. It is that segment which is called SOHO. We will provide the overview and information on a line of devices, history of its development and the short description of functionality in this article. It will be a question of universal CPE AudioCodes MediaPack of a series 26x (MP26x).

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Choice problems: Hybrid arrays of data storage or arrays flash memory

1 year, 5 months ago


In our blog on Habré we not only tell about development of a cloud service 1cloud, but also we write about new technologies much, including in the field of processors and memory. Today we present to yours adapted translation of a note of the director of research of the IDC company Phil Goodwin (Phil Goodwin) about pluses and minuses of technologies of hybrid arrays of data storage and arrays a flash memory.

With falling of the prices one SSD more and more companies offer the arrays entirely constructed on a flash memory, but whether really they it is better than the hybrid arrays containing both solid-state drives, and hard drives?

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The market of Virtual automatic telephone exchanges died

1 year, 5 months ago
The market of Virtual automatic telephone exchanges died, without having managed to appear. MSP did not begin to use VATS, despite their availability. Attempt to expand the market on small business which has no funds for purchase of traditional automatic telephone exchanges was not repaid. At small and microbusiness there are no reasonable reasons to pay for VATS.

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Reasoned arguments. To an analytics question in the company

1 year, 5 months ago
Each of us periodically takes a blood test on the analysis. Recently everything became very convenient: handed over, received the login/password, in several hours glanced on the website in a personal account and there all indicators in numbers, and nearby green or red bullets "regulation / not regulation". But very few people know that even completely green column or a column with couple of red bullets on some unpopular indicator like eosinophils can testify to malfunctions in an organism, and only the doctor can truly interpret a picture. Why? Because all indicators need to be considered in total and interrelations — in itself they bear purely help information. Also and in business, complex and multilayer system, it is necessary to build system of analytics which will give complex understanding of a situation. What do we should construct analytics?

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Opportunities and restrictions of Samba 4 as domain controller Active Directory

1 year, 5 months ago


Introduction


Initially, Samba represented the software package which allow to address network drives and printers on different operating systems under the SMB/CIFS protocol, but, starting with version 4 in Samba, an opportunity to act as the domain controller and analog of the Active Directory service was implemented.

In spite of the fact that Samba 4 is a quite good solution for replacement of services Active Directory Domain Services and in it the considerable part of functionality of AD is implemented, it, nevertheless, has a number of essential restrictions which can become critical at implementation and operation of a solution in production environment.

In this article we will try to answer a question, such replacement and what problems and restrictions it is possible to face can be how good.

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Samsung started production of modules of memory of TSV DDR4 128 Gb for servers

1 year, 5 months ago
On November 26 this year the Samsung Electronics company declared the beginning of a mass production of memory with an amount of 128 GB, intended for corporate servers and data processing centers. TSV DDR4 128 Gb will be issued based on the TSV technology ("through silicon via").


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Seminar of "Backup of any objects on the basis of CommVault Simpana", on December 10, data-center of OST (Moscow)

1 year, 5 months ago
We had several places on our tomorrow's backup seminar based on CommVault Simpana. All guests I wait for pleasant bonuses: free test drive of new service and excursion on one of the largest data-centers of Russia — TsODu OST. Here a photo for a priming)

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How to cover with monitoring all layers of infrastructure

1 year, 5 months ago
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Somehow I considered that 1 minute of idle time of hh.ru on weekdays affects about 30 000 users in the afternoon. We constantly solve a problem of decrease in number of incidents and their duration. We can reduce quantity of problems the correct infrastructure, architecture of the application is a separate subject, we will not take it in attention yet. Let's talk better about how quickly to understand what occurs in our infrastructure. Here just we are also helped by monitoring.

In this article on the example of hh.ru I will tell and I will show how to cover with monitoring all layers of infrastructure:
  • metrics client-side
  • metrics from frontends (nginx log)
  • network (that can be got from TCP)
  • application (log)
  • database metrics (postgresql in our case)
  • operating system (cpu usage can be useful too)

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License PaaS vs. Four noble truth of IT infrastructure

1 year, 5 months ago
Everything flows, everything changes, everything moves. This popular expression very precisely characterizes the processes happening in modern business and first of all in business telecommunication. Most of experts agree in opinion that players of the IT market have to move forward actively at least just to remain on site. According to analysts the comfortable delusion is peculiar to many figures of a telecom: "We have no need to hurry, we will manage to construct and start all necessary services and platforms by own efforts, we flexible and technological, are not present the reasons for haste." Unfortunately, it is illusion. To begin it was necessary to start new services still "yesterday". In this hub we will share the reasons about what of methods of deployment of new services and platforms on the party of telecom operators is the most effective and justified.


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We test quality of passing of VoIP across the general canals (Windows)

1 year, 5 months ago
Earlier we in details sorted utilities for Android and iOS for testing of link quality from the device to IP-ATC. There was only Windows.


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