sebastian alex scsa, to comment:
There are three key concepts in RAID: Mirror, copying data on more than one disc; Striping, of the division of Data on more than one disc, and correction of errors, which are stored redundant data to allow detect problems and possible fixes (Known as fault tolerance). Different RAID levels use or more of these techniques, depending on the system requirements. The main objectives of the use of RAID are to improve the reliability, important for the protection of information that is vital to a company, such as a base Data of customer orders, or when speed is important, for example, a system that provides on-demand TV programs many viewers.
What is the RAID software and hardware RAID just an idea and uses.RAID combines physical disks into a single logical unit or by using hardware or special software. Hardware solutions are often designed to be attached to the present system as a single hard drive and the operating system is unaware of the technical functioning. software solutions are typically implemented in the operating system , and new RAID arise as a single hard disk applications.
There are three key concepts in RAID: Mirror, copying data on more than one disc; Striping, of the division of Data on more than one disc, and correction of errors, which are stored redundant data to allow detect problems and possible fixes (Known as fault tolerance). Different RAID levels use or more of these techniques, depending on the system requirements. The main objectives of the use of RAID are to improve the reliability, important for the protection of information that is vital to a company, such as a base Data of customer orders, or when speed is important, for example, a system that provides on-demand TV programs many viewers.
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(From old blog's comments)
RAID-When data is being written, he will write to several disks simultaneously. If one fails, they can be "hot swapped." You get that bad drive and replace it with the exact model. It'sa good in the case of a hardware failure. Other readers will continue to write .
Backup-If you lose data or information overwirte, RAID crush each drive. You wanted RAID recorded data to a tape drive (most often the cause of releativly cheap), so you can retrieve dates of the previous backup. RAID is constantly writing on current data. Backup is stored for later retrieval if necessary.
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