RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which enables a system to take advantage of a number of hard drives as a single logical unit. Put simply, all drives are used as one and the information on all of them is identical. This kind of a configuration has 2 major advantages over using a single drive to keep data - the first is redundancy, so if one drive breaks down, the info will be accessible through the remaining ones, and the second is improved performance because the input/output, or reading/writing operations will be spread among several drives. You can find different RAID types in accordance with what amount of drives are used, whether reading and writing are both handled from all drives concurrently, whether data is written in blocks on one drive after another or is mirrored between drives in the same time, etcetera. Based on the exact setup, the error tolerance and the performance vary.
RAID in VPS Servers
The physical servers where we create VPS server employ quick SSD drives which will boost the speed of your websites substantially. The disk drives operate in RAID to ensure that you will not lose any info due to a power loss or a hardware malfunction. The production servers use multiple drives where the data is stored and one disk is used for parity i.e. one bit is added to all the data copied on it, that makes it easier to recover the website content without any loss if a main drive breaks down. If you use our backup service, your info will be stored on an independent machine that uses standard hard-disk drives and though there isn't a parity one in this case, they are also in a RAID to guarantee that we will have a backup of your website content all the time. With this kind of setup your data will always be safe as it will be available on multiple disk drives.