Developers Club geek daily blog

Future of data storage: Multilayer 3D - disks with high capacity

1 year, 9 months ago
In our blog on Habré we not only tell about development of a cloud service perspective technologies of data storage, and also pluses and minuses of technologies of hybrid arrays of data storage and arrays a flash memory. Today we present to yours adapted translation of a note of Karl Paulsen, the technical director of the company of Diversified Systems, about multilayer 3D - disks with high capacity.



At any time it is possible to tell with confidence that requirements to local, corporate or cloudy storages worldwide only raise. Some time seemed that cloud computing will change the relation to local memory devices, however it did not occur.

Much of conferees of Storage Visions 2015 (which was carried out in January, 2015 in two days prior to CES in Las Vegas) told that prefer to keep the local storage "under control", sometimes expanding its opportunities by means of free cloudy applicaions.

To satisfy the growing requests of local and other storages, tanks of hard drives gradually increased: at first to 4 TB, then to 6 TB. Now the hard drives (HDD) of an industrial class possessing with a capacity of 8 TB and working at 7200 revolutions per minute became available. Such HDD of huge capacity found application not only in cloud computing, but also in corporate data-centers, and to that there are several reasons.

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7 errors of the ETL developer

1 year, 9 months ago
Projects of data storages are part of IT infrastructure of the majority of large enterprises for a long time. Processes of ETL are part of these projects, however developers sometimes make the same mistakes at design and maintenance of these processes. Some of these errors are described in this post.

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To refuse peaceful atom? Rosenergoatom builds the most powerful DPC in Russia

1 year, 9 months ago


Recently in the West the tendency to decrease in use of the electric power with the NPP for the organization of power supply of large enterprises is observed. Russia nevertheless does not hurry to refuse peaceful atom pays more and more attention to development of the NPP and finding of opportunities for the most rational use of their resources.

News of construction of one of the largest and powerful data-centers of Russia directly near the Kalinin NPP became confirmation of it.

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Separate storage of medical data and regional information systems

1 year, 9 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.

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

1 year, 9 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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Samsung started production of modules of memory of TSV DDR4 128 Gb for servers

1 year, 9 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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As Moore's law influences evolution of technologies of data storage

1 year, 9 months ago
In our blog on Habré we considered a question of influence of relevance for cloud services. But how the situation in area of technologies of data storage is? As Moore's law influences their evolution — Wired edition material is devoted to this subject. We present to yours the main theses of this note.



Each 10-15 years the industry of data storage undergoes serious transformation. Last time it occurred in the late nineties when storage networks appeared (SAN, storage area network). Emergence of this technology allowed the large companies to receive high availability, redundancy and other important characteristics. Now, transformation happens around the Flash technology, but it is not it per se, and in the accompanying evolution of other elements of data-centers.

Moore's law formulated still in the seventies the last century claiming that the number of the transistors placed on an integrated circuit chip doubles each 24 months meanwhile works. In 1970 the speed of processors made 740 kHz. Based on Moore's law today we is had multi-core processors which speed is measured by gigahertzes. This drama break performed for last four decades promoted development of new innovation technologies, like the same virtualization.

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Proxmox 4.0: The root partition into ZFS RAID1 or how to increase fault tolerance if in the server only 2 disks

1 year, 9 months ago
The task — to start Proxmox and several virtualok on the server with only 2 disks turned up to me. At the same time it was required to provide well though some reliability and simplicity of correction of problems of one of disks connected with failure. Further in a note the detailed description of testing of a solution at the stand.

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Accidents on server farms in Azerbaijan and Great Britain

1 year, 9 months ago
Stay DPC are extremely expensive pleasure, dauntaym in several seconds can turn back serious financial and reputation losses. The accidents which happened quite recently still again proved it. Two large-scale server farms — one in Great Britain, the second in Azerbaijan suffered.



Almost all population of Azerbaijan lost Internet access

In one of data-centers of the Delta Telecom company fire flashed. Dauntaym lasted for eight hours. After this incident it was possible to get access to Internet services only about use of channels of the local mobile operators Backcell and Azerfon.

The fire in Baku on a server farm of Delta Telecom became the reason of shutdown. According to the official statement of representatives of this company, several cables in old DPC lit up. Fire and abnormal services were involved in process of liquidation of ignition. Because of incident work of banks was almost paralyzed – operations were not performed, operation of ATMs and payment terminals was stopped. In many regions mobile communication was unavailable.

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11 errors of your backups

1 year, 9 months ago
All users can be separated into two groups: on those who regularly do backups and on those who did not begin to do them yet. If you belong to the second category, then it means only that you insufficiently well or not fully imagine quantity and scales of the troubles capable to damage your data – theft, the fire, a hurricane, viruses, bugs of the software, breakdown of iron, an error of users and all in such spirit. Well, or did not face passing of "quest" on data recovery after their loss yet (which, unfortunately, can not always be passed successfully). Anyway, it is better to know beforehand what errors should be avoided at backup therefore we present to yours eleven errors during creation of a backup. It even not so much errors, how many councils and the list of strategy which should not use (first of all, for users of Mac). Welcome under kat.


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