Between heaven and earth

Between heaven and earth 3r33333. 3r3-31. This story is about one of the projects implementing IT solutions, namely, about the deployment of a system of virtual workplaces for employees of the Sukhoi Civil Aircraft company. And we chose it not by chance! After all, the successful work of many enterprises and organizations, especially such high-tech ones as the aircraft industry, depends on modern IT infrastructure.
 3r33333.
 3r33333. IBS Platformix system integrator has deployed Virtual Desktop Infrastructure (VDI) for employees of this company. It was based on hardware from several manufacturers, including Lenovo servers ...
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HTTP /2 configuration using the example of Apache 2.? PHP 7 and Ubuntu ??? LTS

I understand that, perhaps, Apache is not currently the preferred choice for launching new projects on it, nevertheless, it exists, and projects are working on it. The choice may fall on it for some personal preferences, for compatibility requirements, or for some other reasons not the essence. In this article I want to describe in points how to configure support for the HTTP /2 protocol on the Apache web server, because I myself use it in such an article 3r334. I need [/s] I needed, and I hope that someone will also need it in practice. 3r3192.  3r3204.
3r3197. 3r3192.  3r3204. What is HTTP /2? ...
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WDM Technologies: Integrating Data Centers into Resilient Clusters

 3r3176. 3r3-31. Despite the reliability of modern data processing centers, another level of redundancy is needed for critical facilities, because the entire IT infrastructure may fail due to a man-made or natural disaster. To ensure disaster resilience, backup data centers have to be built. Under the cut, our story about the problems that arise when they are combined (DCI - Data Center Interconnection). 3r3164.  3r3176. 3r3164.  3r3176. WDM Technologies: Integrating Data Centers into Resilient Clusters
3r3164.  3r3176. 3r3164.  3r3176. The volume of data processed by mankind has grown to incredible values, and the role of IT infrastructure in business processes is so ...
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Powering IT equipment: safety or security? part 2

Powering IT equipment: safety or security? part 2We continue the article, the purpose of which is to share experience and show key features and frequent mistakes arising in the design and organization of power supply subsystems of IT infrastructure and data center in general. But I would like to slightly expand the audience and devote several sections to basic elements of electrical safety and protection of equipment and people.
 
 
Those who missed the first part or wants to remember the first part of you can go here .
 
 
For those who understand what an automaton and RCD are, for which they are needed, what they are protecting from - ...
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USE, RED, PgBouncer, its settings and monitoring

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USE, RED, PgBouncer, its settings and monitoring
 
We began to update the monitoring service for PgBouncer in our service and decided to do a little bit of combing. To make everything work, we draw the most well-known monitoring performance methodologies: Brendan Gregg's USE (Utilization, Saturation, Errors) and Tom Wilkie's RED (Requests, Errors, Durations).
 
Next, you will learn how we are all up there and about the features of the PgBouncer configuration parameters.
 
First about the methods themselves
 
Although these methods are quite well-known (about <{full}>

 
We ...
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Optimizing graphics for the web: the most important

Optimizing graphics for the web: the most importantThe author of the e-book is Eddie Osmani, one of the leaders of the development of Google Chrome
 
 

tl; dr


 

Image compression should always be automated


 
Optimization of graphics must be automated. It's easy to forget about it, recommendations change, and the content itself can easily slip past the assembly line. For automation when assembling, use imagemin or libvips . There are many others.
 
 
Most CDNs (for example, Akamai ) And third-party solutions like ...[/h][/h]
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UPS and battery array: where to put? Yes, you wait

UPS and battery array: where to put? Yes, you waitUntil now, the problem of accumulation (accumulation) of electricity existed without any global changes, a technological breakthrough in this area no one could offer. It was the same battery Gaston Plante 1859 , modified by various auxiliary technologies and equipped with improvements in the field of electrochemical processes, the fight against the release of hydrogen, other materials of the hull, etc. At the turn of the beginning of 2000 appeared a different kind of ...
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Testing of software RAID-arrays for NVMe-devices using the SNIA

Testing of software RAID-arrays for NVMe-devices using the SNIAtechnique.   A few months ago, in the course of working on another project, the guys from our research laboratory conducted research on NVMe disks and software solutions in order to find the best option for building a software array.  The results of the tests were surprisingly discouraging at that time - the huge potential of the speed of NVMe disks did not correlate with the demonstrated performance of the available software products.  report G2M   At the moment, Intel is one of the leaders in the production of NVMe components. It was on their equipment that we conducted tests to evaluate the capabilities ...
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Testing of caching technology for RAID arrays Adaptec

Testing of caching technology for RAID arrays AdaptecSolutions for working with RAID arrays from hard drives have been used for a long time. In general, they continue to be popular in many areas, when a relatively inexpensive, fault-tolerant, large-capacity array is required. Given the size of modern hard drives, their speed, as well as other reasons, the greatest practical interest is arrays of RAID6 (or RAID6? if there are many disks). But this type of arrays has a low performance on random writes and it's not easy to do anything with it.
 
 
Of course, in this case we are talking about the speed of the "raw volume". In real life, it is added to ...
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How effective is the virtual file system procfs and whether it can be optimized for

How effective is the virtual file system procfs and whether it can be optimized forThe proc file system (hereinafter simply procfs) is a virtual file system that provides information about processes. It is a "perfect" example of the interfaces of the following "everything is a file" paradigm. Procfs was developed a long time ago: at a time when servers on average served several dozen processes, when opening a file and subtracting information about the process was not a problem. However, time does not stand still, and now servers serve hundreds of thousands, or even more processes at the same time. In this context, the idea of ​​"opening a file for each process to subtract the ...
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