The Microsoft Exchange Server Email Hosting can be accessed by multiple clients, as every family Unix-like, Microsoft Windows 95/98/Me/2000 Professional/XP/Vista/7 and currently also work on the platform like Mac OS X from Apple Inc., Mac OS X v10.6 – Snow Leopard, is currently the 2010 version released on November 9, 2009.
Exchange Server 2013
The latest version of Microsoft Exchange Server, is the 2013 version. Leaning on pillars such as security and flexibility, has become an important tool in the corporate world. With increasingly more users seeking a solution that is flexible and is where users need when they need it became necessary to use solutions such as Microsoft Exchange Server.
Some points are worth mentioning in the new version of Microsoft Exchange Server, for example:
Website Hosting is a service that allows people or companies to store their information, pictures, videos or any content through online systems being accessible by Web Hosting Providers. The Site typically are companies that provide space to store that content on its servers and internet connection to these data to their customers.
Among the types of website hosting services are:
In this type of service, the server is shared among multiple companies that hire the hosting service, ie, is the division of the resources of a server across multiple clients.
Each has its own disk space and bandwidth individual band, according to the hosting plan contract. The value depends on the space to be used, the resources available, site traffic, among other features.
The plan is recommended for those who do not have much traffic or are starting a website. In this type of hosting the main attractions are price, simplicity of use and maintenance, one of the most used by small businesses.
Recommended for: Small sites with low volume of requests.
VPS Hosting(Virtual Private Server)
A VPS or virtual private server is a technology that is rapidly growing in the web hosting industry.
A VPS is created by software that partitions / divides a physical server to create multiple virtual servers within it, a process called virtualization of servers.
Recommended for : medium Sites with volume of accesses between medium and high.
In this type of hosting, instead of sharing the server with other customers, the hardware is dedicated exclusively to the needs of the contracting client.
The client is not obliged to share resources, providing a superior level of control, flexibility and performance. You can choose your own operating system, install the applications themselves and incorporate the security mechanisms you best for your environment.
Nevertheless, this is a scenario that requires you to have a certain ability to manage and maintain a server. Unlike shared hosting, dedicated hosting is not recommended for inexperienced users.
Recommended for : Large companies with very high volume of requests, data bank of dense and diverse applications.
A server is either a software (a computer program) in the client-server model, or hardware (a computer), on which, software runs under this concept.
A server (software) is a program with another program, the client communicates to procure.
A server (hardware) is a computer on which it run one or more server (software).
As the server hardware is in the jargon, the term Host is used. For the server as a software-term, there is no other name. The ambiguity of the term server is further explained and discussed in the following section.
History of the server-term
When the first server was programmed, they were the computers on which they are installed, referred to as a host. At that time, they were almost exclusively hosted special powerful computer ( mainframe ). With the increasing power of standard computers certain server services could also be provided by them and thus came into the light of a broader public.
The ambiguity present in some cases leads to confusion because the name server is often used in a form in which for the layman, it is especially difficult to see whether it is the hardware or software.
Evolution of host and server
The term host is in the computer since 1960s in connection with mainframes or mid-range systems and there usual time-sharing or multi-user-operating systems used. These systems are highly structured and essentially consist of a central processing unit, which is also known as the host and all the “intelligence” of houses, and the “dumb” terminals, which are only used as user devices in the workplace and in practice only for input and output of data are used.
In the Unix environment, differentiation at this time is clear, here are (usually graphical) workstations and workstation operating systems and their software (mostly console-based) distinction servers and server operating systems and associated software. However, by now are both expressions – at least colloquially and in connection with hardware – practically synonymous.
Server as a term for software / client-server concept
A server is a program that is offering services. As part of the client-server model , a different program, the client (customer), use this service. The server is ready to respond at any time to contact a client. The rules of communication (format, call the server and the meaning of exchanged between server and client data), called protocol and are each defined for a service.
In general, the concept can be extended to a group of servers that offers a set of services. Examples: mail server (extended) web server, application server, database server.
In practice, since servers usually collected run on specific machines, it has become common to refer to this computer as a server itself. The same examples: mail server, web server or application server.
Server as a term for hardware
The term server as hardware is used:
When referring to a computer whose hardware is designed for server applications, and partly by specific service areas (eg, high I / O throughput, large memory, many CPUs , high reliability, yet insignificant graphics performance).
The monitoring and maintenance of a server is an important activity in any organization. Frequently used come between so-called network monitoring systems.
The simplest case of a server is the one where on a host server software is installed.
If the performance of a single host is not sufficient to cope with the tasks of a server, you can connect several hosts to form a composite, which is also called computer cluster. For this purpose, a software is installed on all hosts that causes this and represents clusters towards the clients as a single server.
A dedicated server is a server that is intended for a network service or more permanently operated services, and not for everyday tasks (Workstation) is used. In marketing, the term is used to suggest to the customer exclusivity.
Automated control and data center management is a complex engineering, combining many technological and low-power subsystems into a single system, to further the optimal management and comprehensive monitoring of the technical state of the data center facility. The monitoring system is a vital component of any data center uptime.
Externally data center monitoring system is presented with a graphical display image of data center, its interface is very easy to work: you can always see information about what happens on the court fast enough, it is not overloaded with unnecessary features and options. Based on the testimony of one can conclude the work of all life support systems of data center.
Example, you can track the performance of air-conditioning system: press on the remote control icon of conditioner, which is included (the display is visible inscription: K6 (AC 6) included). The display shows the temperature of the air entering the air conditioning, the temperature of the cooled air outlet, filter status, fan, and two compressors – working and disabled. By off the air conditioner (K3 – off.) Can say the same thing, only temperature sensor works.
Then, we can in the same way check the temperature in the data center. At certain points of the hall hang temperature sensors, they are placed on a wire over the hot and cold aisles. With the monitoring device can be deduced statistics set time period within which to track the temperature change, etc. You can also configure and maximum temperature (in this case 30 degrees) in the hall. If you exceed the specified value triggers a warning system that sends alarm messages to the email addresses of technical services, as well as SMS-message to advance to the system prescribed DPC staff phones. The humidity level can be viewed in the same way (in our example, the temperature in the hot aisle 25 ? C, humidity – 39.3%).
Similarly connected to the monitoring of the UPS – uninterruptible power supply: we click on the icon “UPS-1″ on the main screen of the system – the display shows the value of the load phases Percentage voltage phases, the battery voltage, charge, itd . UPS running in parallel, so all the information in the normal mode, in this case, will be identical.
Icon “Pm” – is the main switchboard of the data center. Here we can see diagram data center. See the status of their work: the state “DSU” – is fully prepared (glows green). Both power input glow green, so we can conclude that they are working properly. If, for example, there is a trip of one of the inputs, the input status icon turns red triggered ABP. If the power is automatically turned on both inputs powered by DGS, which at the time of the accident and shall supply all equipment and systems data center.
Now look testimony diesel: condition – off mode – auto, no additional data is now no other indicators that are activated only after the DSU. You can view the battery voltage, oil pressure, coolant temperature, etc. To avoid problems with the launch of AIS in the winter, you must have winter fuel and maintenance plus temperature inside the container.
Positive temperature in the container will easily start the engine even in the most severe frosts.
The monitoring system is deployed in the data center of any volumes. Increasing the size of the data center entails an increase of control points for monitoring, which complicates the perception of information and technical staff requires more fine-tuning notifications about events in the data center.
Dedicated servers comes at higher prices if associated with a system disk with SAS technology. Here we explained the reasons that lead to a different financial offer by the provider, and when you need to choose the SAS compared to the best known format SATA.
When you configure a range of dedicated servers, many domestic and foreign providers allow you to choose the disk system you prefer, proposing among different types of solutions, often summarized in as many acronyms as SATA, SAS (together with NL-SAS) and SSD.
While the SATA and SSD disks are well known (because used in desktop solutions), SAS technology and its derivative NL-SAS, on which we will focus in the following, are not well known and often do not understand the real difference and the benefits that these proposals can be made to dedicated servers, thus justifying a higher cost for different configurations only disks in the system.
The acronym SAS indicates a technology solution designed as an evolution of the ancient SCSI, so that the acronym stands for Serial Attached SCSI. The evolution of serial SCSI format, which has followed in the footsteps of the evolution of disks from the desktop PATA (Parallel ATA) SATA (Serial ATA), with all the benefits that come with it.
SAS drives are therefore designed for enterprise use, and dedicated servers to ensure not only greater speed also due to a greater number of revolutions of the disk per second (disks now it has come to 15 000 RPM with a transfer rate of 12 Gbps ), but are designed to ensure a high level of reliability, because of not only to the technology itself, but also to the electronic components used to build the units, targeted at the enterprise and thus better controlled by the producers.
SAS Dedicated servers are most reliable?
The answer is simple: reliability is the price. A SAS disk has a BER (Bit Error Rate) of 1 in 10 ^ 16 , or you can see a bit error per 10 bits of billiards. The SATA drive has a BER (Bit Error Rate) of 1 in 10 ^ 15, then you have a bit error every pool of bits. As these figures are very large in both cases, for applications in which the correctness of the data is critical (as in applications Enterprise), SAS technology is the most suitable. Similarly, for SAS disks changes the Mean Time Between Failure (MTBF) rising from 1.2 million hours (136 years) of the SATA 1.6 million hours (182 years) of the SAS.
These data, plus a whole host of features that SAS technology guarantees with respect to the SATA data port failover on multiple, multiple hosts, hotplug (officially supported also by the specific SATA), simultaneous data channels and enterprise command queuing, which then make the SAS best choice in all cases in which the budget is not a problem, but we look for the highest possible reliability solutions disks to be associated with functions dedicated servers with mission critical.
To bridge the gap between SATA and SAS, are then come on the market the devices NL-SAS , hybrid solutions between SATA and SAS, with the advantages of SAS and reliability in terms of BER and a MTBF of SATA, while maintaining overall performance better than the latter.
Dedicated Servers with SATA and SAS
In short, if you configure dedicated servers seeks above all reliability, SAS is the right answer in the choice of system disks, but if you look at the amount of space at a competitive price, then it is right to choose the SATA subsystem.