RAID is a redundant set of independent disks that aims to obtain advantages in the use of subsystems of two or more disks. Among them we can mention increased performance, security, availability and fault tolerance. There are several RAID levels for the most diverse purposes; in this post we will cover everything about RAID 5.
Understand what RAID 5 is and how it works
RAID 5 is a disk array widely used in server and storage that works with a large number of HDs, and requires at least 3 disks to be implemented. Unlike RAID 1 that uses half of the disks to keep full copies, in RAID 5 independent of the number of disks contained in the array, space equivalent to only one of the disks is used to maintain redundancy through parity bits that are distributed alternately between all the disks in the array. If any of the disks fail, the controller is able to calculate and recover in real time the data on the defective disk, thus allowing the system to continue operating even without one of the disks.
How does the parity system work?
Parity works in a very simple way. For each group of bits an additional bit is generated that can be even or odd depending on the number of bits contained in the group.
There are some rare exceptions where some data recovery service providers are able to recover the data partially or even totally, but this is a complex process and the chances of being successful are small. These professionals are accessible at salvagedata
What is RAID 5 for?
The applications of RAID 5 can be varied, being widely used in servers and storages with large number of disks which makes it ideal small and medium enterprises that need great capacity and security.
What is the performance gain?
Although there is a loss of performance during writing (due to parity calculation) compared to RAID 0 for example, RAID 5 simultaneously reads and writes all the disks in the array which causes a considerable increase in performance compared to the use of only 1 disk.
Can you recover data when two or more HDs in the array fail simultaneously?
Although some RAID recovery labs State of New York sometimes succeeds in data recovery when more than 1 disk is failing, but sometimes, data may be completely lost, so we point out that regardless of any RAID level that you are using or will come to use the backup is indispensable.