Costs of virtualization, virtual machine Oracle VM VirtualBox Host-based Windows OS

Costs of virtualization, virtual machine Oracle VM VirtualBox Host-based Windows OS

Today, virtualization is widely used in almost any part of the IT industry - from personal mobile devices to high-end data centers, allowing to solve a variety of tasks. Virtualization can take different forms - ranging from virtualization and emulation platforms, ending virtualization resources. But today we will focus on native hardware virtualization - modern processors support it with a set of instructions, such as Intel VT-x or AMD-V. Native virtualization - a technology that provides computing resources, abstracted from the hardware level. If we take, for example, the segment servers, such an abstraction allows multiple virtual systems on a single hardware platform, and makes it easy to move virtual systems from one hardware server to another - for example, if it fails, or modernization. Before the advent of hardware-assisted virtualization, all the advantages of technology overlap great loss of productivity and low speed of the virtual machine as a whole. The popularity of virtual machines began to grow to the extent that, as manufacturers of hardware platforms began to take active steps to reduce the costs of virtualization (the appearance of hardware support, the introduction of new regulations, reducing latency by following the instructions), and processor performance has become sufficient to "pull" the virtual machines at an acceptable rate. As mentioned above, one of the key factors for the normal operation of the native hardware virtualization - Support for specific instruction sets. Intel introduced its own set of instructions VT-x in 2005, even within the architecture Netburst, applied in processors Pentium 4. AMD developed its instruction set, AMD-V, and the first processor with its support came on the market in 2006. Some time later, the two companies have proposed a new set of instructions: Intel EPT (Extended Page Tables) and AMD RVI (Rapid Virtualization Indexing), respectively. The essence of both sets is that the guest operating system obtains control of virtualized memory pages directly, bypassing the hypervisor - it reduces the burden on him and raises several speed virtual system. To forward directly to the guest OS devices, Intel has developed a set of instructions Intel VT-d. In the arsenal of Intel, there are other sets of instructions for virtualization: Intel VT FlexMigration, Intel VT FlexPriority, VPID, VT Real Mode, VMFUNC. As new generations of processors manufacturers not only offer new opportunities instruction set virtualization, but also reduce the timings perform specific instructions to improve performance of the virtual system as a whole. For example, in Pentium 4 delay on the execution of instructions and VMCALL VMRESUME approaching 1500 nanoseconds, and the Core 2 Duo (Penryn) it was already less than 500 nanoseconds. Bridging the gap in performance between the real and virtual system to make the virtual machine (VM) is much more advantageous to use, including for solving the corporate level. The most obvious advantages are the increase in the average utilization of equipment (several VMs evenly using hardware resources, reducing downtime), as well as the launch of an outdated operating system that does not meet modern requirements (eg, security), but you need to start and run a unique software (or other reasons). By the way, so popular today as cloud services are based on virtualization technology. Summarize the main benefits that the company receives from the use of virtualization. Is This: - average load increase of the physical server, and, consequently, the utilization apparatus which, in turn, reduces the overall cost AO; - easy migration of virtual servers from one physical to another when upgrading hardware; - easy disaster recovery virtual server with hardware failure of the equipment: the virtual machine is much easier to move to another physical server, you migrate the configuration and software from one physical machine to another; - substantial simplification of the transfer of users or business processes to new operating systems and new software: using the VM allows you to do it piecemeal and without touching the hardware resources; In addition, in the process, you can easily analyze and correct errors, and to assess the feasibility of "on the fly"; - support for business processes work outdated OS, from which, for whatever reasons, at any given time can not refuse; - the possibility of testing of various applications on the VM, without requiring additional physical server, and so on. d. - other applications. Thus, the feasibility of using virtualization to date has not questioned. Technology provides too many advantages in terms of business organization that makes a blind eye even on the inevitable loss of system performance. Nevertheless, it is always useful to understand which level of performance loss between the real and the virtual system in question. Especially because they often depend heavily on the type of tasks and requirements for hardware resources. Somewhere it is important from the point of view of accounting, somewhere - will help determine what level of performance of the real system is needed to achieve the desired level of performance on a virtual system. Finally, there is border types of problems that can be solved with the help of both virtual and real systems - and there is the issue of loss may be the deciding factor.

Apple will buy used the iPhone in China, which after the restoration will be on sale again

Apple will buy used the iPhone in China, which after the restoration will be on sale again

According to the source, Apple is planning to introduce in China exchange program used iPhone smartphones on the new products of the company.
Consumers can bring their old cell phones in Apple stores and get a discount when they purchase other products from 31 March. Redeem worn electronics took the company Foxconn, which will restore it, update, and again put on the market. Recovered smartphones Foxconn will sell on sites eFeihu, FLNet and Taobao. Negotiations are under way and the sale in retail stores.
The company Foxconn, is known to produce smartphones iPhone, iPad tablets and laptops MacBook, speaking contract manufacturer Apple.
Such a program has already shown its effectiveness in the US where it was launched in 2013 and has led to an increase in sales. Now in the US Apple stores can deliver smartphones and other manufacturers get a discount on the purchase of products Apple.

Source Bloomberg

Toshiba - it's laptops, televisions and "smart garden."

Toshiba - it's laptops, televisions and "smart garden."

  Toshiba surprised development in the field of so-called "smart garden": the company has perfected a system of hydroponic technology for growing green salads without soil, right in the water.
That is, anywhere in the world can build a factory, producing year-round fresh salads. Specialists create at the "clean rooms" where the temperature is controlled, air composition, the amount of chemicals and even dust. All the necessary nutrients are added to the purified water, and the appropriate dose of ultraviolet radiation on plants receive special lamps.
As a result, this salad is not treated with chemicals (of course, if it is not provided technical process), there are no parasites and foreign microorganisms. Rigor of process technology at the absolute: before you go to the "clean room" employees are serious disinfecting procedures.
The company stressed that they are willing to help us integrate this technology in the field. Sounds like science fiction, but for our harsh climate solution is very relevant. If in areas with unfavorable climate (and we have them - the majority) to build several of these factories, we can solve the problem with a poor harvest, and the high cost of imported greenery. Not sure what the Japanese technology suitable for the cultivation of more important crops - such as cereals or legumes, but it may turn out to grow vegetables.
The company also develops the concept of Human Smart Community, which implies a constant development of new ways to get energy and rational use of natural resources. Together with the Honda company Toshiba has developed a charging station for electric vehicles, which use the energy from solar panels. The company also invested seriously in water purification systems and ozone generators, fitness bracelets and even robots (and not for fun, but for social needs - for example, care for the elderly).
Well, let's see what progress the company to reach this market.