In other words, you have a request for the website, sent via Web browsers. This request is answered by the web server by entering the desired page to the Web browser, which in turn shows them.
The web server works this way, there are many other types of servers that are frequently used.
Types of servers
Probably the easiest of the server, the file servers. You can send your request to add a file or a file over the network to the file server. (File Serverrequire a large bandwidth.) Another equally simple server is the disk server.
A comparatively more advanced version is a database server. In a database server, the user passes a message to the server (in SQL - Structure Query Language ") and the results are returned via the network. The data on the server and can use the code that the request to find the desired data processes. The customer is not at all the files that have been adopted to maintain the required scanInformation.
The other server, the transaction server, which an SQL database engine contains. The procedural statements that are executed on the servers, either the entire SQL transactions, or they do not view as a group. Because the applications are mission critical to the transaction server, they require an increased level of security and integrity of the database. The exchange usually consists of a single request and response.
A server that is very often used in contrast to the transactionServer is the e-mail server. This receives mail from other e-mail clients and servers. The mail server consists of a warehouse, a list of users, a number of communication modules and a set of rules defined by the user. The storage space is a database containing information that consists of the received e-mails and in transit. The user defines rules determine the response of the mail server, certain messages, for example, only certain e-mails can be sent to a company, while receiving the remainder toblocked. The communication modules (their number being determined by the mail server) for the transfer of messages back and forth, the e-mail clients.
Server function normally without manual intervention and they are expected to work almost constantly, so the RAID is used.
RAID (Redundant Array of Independent Disks)
This is also known as "Redundant Array of Inexpensive Disks". This term refers to a computer-data storage and also sharesreplicate data between different hard drives. In a RAID, the different physical disks are combined into a single logical unit by using a special hardware or software.
The three main concepts of RAID are:
· Mirroring - the copying of data on different drives in the array
· Striping - the division of data in more than one hard disk, and finally
· Error - redundant data is saved for error analysisDetection in case of need
RAID systems are designed to function reliably, so they are ideal for servers. But at times, array also fail and recover data from a controller (RAID) RAID server is a complicated process.
Data Recovery from a controller (RAID) servers
In the event of data loss, an initial diagnosis is performed, which determines whether each device is accessible. If the media is accessible, aRAW image is created by all the data to a new device, so that the type of information loss can be determined. Sometimes, some devices can be accessed, they are closely tested together to assess the extent of physical damage. Recovery from a crashed RAID in general is the replacement of damaged components like the read / write head, the drive motors, etc . specialized tools are used to restore the lost data.
Are servers with multiple drivesde-touched on to a device to enable the performance of the file system repair and extract the files.
Data loss is usually induced panic. The loss of data from a RAID server requires an important precautionary measure. The disk array should not be changed. Even if they are removed from the server, they should be back in the same order and the restoration of data experts must be contacted.
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