RAID, which stands short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that allows a system to take advantage of multiple hard drives as one single logical unit. To put it differently, all the drives are used as one and the info on all of them is identical. This type of a configuration has two key advantages over using a single drive to save data - the first one is redundancy, so in the event that one drive breaks down, the info will be accessible from the others, and the second is improved performance because the input/output, or reading/writing operations will be spread among a number of drives. There're different RAID types based on what number of drives are used, whether reading and writing are both executed from all the 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, etcetera. Based on the particular setup, the error tolerance and the performance could differ.
RAID in Cloud Web Hosting
The drives that we use for storage with our ground-breaking cloud web hosting platform are not the traditional HDDs, but high-speed solid-state drives (SSD). They function in RAID-Z - a special setup created for the ZFS file system which we work with. All the content that you add to the cloud web hosting account will be kept on multiple disk drives and at least one of them will be used as a parity disk. This is a special drive where an extra bit is added to any content copied on it. In the event that a disk in the RAID fails, it'll be replaced without any service disruptions and the information will be recovered on the new drive by recalculating its bits thanks to the data on the parity disk along with that on the other disks. This is done in order to ensure the integrity of the info and together with the real-time checksum validation that the ZFS file system performs on all drives, you will never have to worry about losing any information no matter what.