RAID, which is short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that makes it possible for a system to use many hard drives as a single logical unit. Simply put, all the drives are used as one and the information on all of them is the same. This type of a configuration has 2 key advantages over using a single drive to store data - the first is redundancy, so in case one drive fails, the information will be accessed through the remaining ones, and the second one is better performance as the input/output, or reading/writing operations will be spread among several drives. There are different RAID types depending on the number of drives are employed, if reading and writing are both done from all of the drives concurrently, if data is written in blocks on one drive after another or is mirrored between drives in the same time, etcetera. According to the particular setup, the fault tolerance and the performance may vary.
RAID in Cloud Web Hosting
The advanced cloud web hosting platform where all cloud web hosting accounts are generated employs quick SSD drives as opposed to the standard HDDs, and they function in RAID-Z. With this configuration, multiple hard disk drives function together and at least one of them is a dedicated parity disk. Simply put, when data is written on the other drives, it's duplicated on the parity one adding an extra bit. This is carried out for redundancy as even in case some drive fails or falls out of the RAID for some reason, the data can be rebuilt and verified using the parity disk and the data stored on the other ones, therefore not a thing will be lost and there will be no service disturbances. This is another level of security for your data along with the advanced ZFS file system that uses checksums to make sure that all the data on our servers is intact and is not silently corrupted.