RAID, which is short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which allows a system to employ multiple hard drives as one single logical unit. In other words, all drives are used as one and the info on all of them is the same. This kind of a configuration has two key advantages over using just a single drive to save data - the first is redundancy, so in case one drive fails, the info will be accessible from the others, and the second one is better performance as the input/output, or reading/writing operations will be spread among a number of drives. There're different RAID types depending on how many drives are used, if reading and writing are both done from all drives at the same time, if data is written in blocks on one drive after another or is mirrored between drives in the same time, and many others. Based on the particular setup, the fault tolerance and the performance could differ.
RAID in Cloud Web Hosting
The revolutionary cloud hosting platform where all cloud web hosting accounts are created employs quick SSD drives as opposed to the classic HDDs, and they work in RAID-Z. With this configuration, a number of hard disk drives work together and at least one of them is a dedicated parity disk. Put simply, when data is written on the other drives, it is duplicated on the parity one adding an extra bit. This is performed for redundancy as even if a drive fails or falls out of the RAID for whatever reason, the data can be rebuilt and verified thanks to the parity disk and the data recorded on the other ones, therefore nothing will be lost and there will be no service disorders. This is another level of security for your info together with the revolutionary ZFS file system that uses checksums to ensure that all the data on our servers is intact and is not silently corrupted.