RAID, which stands short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that enables a system to employ a number of hard drives as a single logical unit. To put it differently, all drives are used as one and the info on all of them is the same. This kind of a configuration has 2 major advantages over using just a single drive to save data - the first is redundancy, so if one drive fails, the information will be accessed from the others, and the second is better performance as the input/output, or reading/writing operations will be spread among multiple drives. There are different RAID types in accordance with what number of drives are employed, if reading and writing are both performed from all of the drives simultaneously, if data is written in blocks on one drive after another or is mirrored between drives in the same time, and so on. Based on the particular setup, the error tolerance and the performance may vary.
RAID in Cloud Web Hosting
Our revolutionary cloud Internet hosting platform where all cloud web hosting accounts are generated uses quick SSD drives as opposed to the traditional HDDs, and they function in RAID-Z. With this configuration, numerous hard disks work together and at least one is a dedicated parity disk. In simple terms, when data is written on the rest of the drives, it is cloned on the parity one adding an extra bit. This is performed for redundancy as even in case some drive fails or falls out of the RAID for whatever reason, the info can be rebuilt and verified thanks to the parity disk and the data stored on the other ones, therefore nothing will be lost and there will be no service disturbances. This is another level of security for your info in addition to 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.