RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that enables a system to use a number of hard drives as a single logical unit. Simply put, all the drives are used as one and the data on all of them is identical. Such a configuration has 2 huge advantages over using a single drive to keep data - the first one is redundancy, so if one drive breaks down, the info will be accessible through the others, and the second is better performance because the input/output, or reading/writing operations will be distributed among several drives. You can find different RAID types in accordance with how many drives are used, if reading and writing are both done from all of the drives simultaneously, whether 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 Hosting
The disk drives that we use for storage with our revolutionary cloud Internet hosting platform are not the classic HDDs, but quick solid-state drives (SSD). They function in RAID-Z - a special setup created for the ZFS file system which we work with. All of the content that you upload to your cloud hosting account will be kept on multiple drives and at least one will be employed as a parity disk. This is a specific drive where an extra bit is added to any content copied on it. If a disk in the RAID stops functioning, it'll be changed without service disturbances and the info will be rebuilt on the new drive by recalculating its bits thanks to the data on the parity disk plus that on the other disks. This is done so as to ensure the integrity of the info and together with the real-time checksum verification that the ZFS file system runs on all drives, you'll never need to concern yourself with losing any data no matter what.