To secure data against hardware failure or any kind of security breach in the network system, some organizations deploy a RAID system to protect data from loss. RAID stands for Redundant Array of Independent Disks and is also sometimes referred to as Redundant Array of Inexpensive Disks. There are several different forms of RAID that are designed to store data in different locations and on multiple disks for data protection.
RAID-1 is a type of server mirroring that contains two hard disk drives that contain the same data. Essentially the data disks mirror one another in the event that one of them fails. This is an easy and very expensive method for storing and recovery data in the event of loss.
RAID-5 stores files on a disk mirroring system that is similar to RAID-1, only a RAID-5 system uses three different hard drives for data storage. One of the hard drives is used for redundancy which allows for very fast read and write speeds that provide an advantage over the RAID-1 method. Additionally, if one of the hard drives experiences failure, this does not have any effect on the data that is stored on the other drives.
RAID-6 is designed very similar to the RAID-5 system except it includes a second array for data that is distributed across several different hard drives which provides extra assurance for data protection in the event of hard drive failure. Because of the added infrastructure, RAID-6 offers high tolerance to hardware failures.
RAID 0+1 is a more expensive method of storing and recovering data because it is made up of one system that is designed for speed and another system that is designed for redundancy. The system incorporates two hard drives which contain the data which is stored across the two drives. There are two additional drives that mirror the data on the first two drives while still maintaining redundancy.
The result is faster access to data in the event of recovery while still retaining redundancy. The system is expensive to run due to the fact that it utilizes more disk space than the RAID-1 and RAID-5 system arrays.
All three RAID Systems provide the reliability of disk mirroring and are often used in conjunction with a data backup site. However, in the event of data recovery RAID systems are quite efficient and fast when it comes to recovery from data loss that can occur from a disaster, hardware failure, or act with malicious intent.