RAID, or Redundant Array of Independent Disks, is a technology of saving data on a number hard disk drives which work together as a single logical unit. The drives can be physical or logical i.e. in the second case one single drive is split into separate ones through virtualization software. Either way, exactly the same info is kept on all the drives and the main benefit of employing this kind of a setup is that in case a drive fails, the data shall still be available on the other ones. Employing a RAID also improves the performance because the input and output operations will be spread among a few drives. There are several kinds of RAID based on how many hard drives are used, whether writing is performed on all drives in real time or just on one, and how the information is synchronized between the hard drives - whether it's recorded in blocks on one drive after another or it is mirrored from one on the others. These factors suggest that the error tolerance as well as the performance between the different RAID types could differ.
RAID in Website Hosting
The SSD drives that our cutting-edge cloud web hosting platform employs for storage function in RAID-Z. This sort of RAID is designed to work with the ZFS file system that runs on the platform and it takes advantage of the so-called parity disk - a specific drive where info located on the other drives is cloned with an additional bit added to it. In the event that one of the disks fails, your Internet sites shall continue working from the other ones and as soon as we replace the malfunctioning one, the data which will be duplicated on it will be recovered from what is stored on the other drives together with the information from the parity disk. This is performed so as to be able to recalculate the elements of every file adequately and to validate the integrity of the information cloned on the new drive. This is an additional level of security for the info which you upload to your website hosting account along with the ZFS file system which analyzes a unique digital fingerprint for every single file on all hard drives in real time.