RAID, or Redundant Array of Independent Disks, is a technology for keeping data on several hard disks that work together as a single logical unit. The drives could be physical or logical i.e. in the second case one drive is divided into different ones using virtualization software. Either way, identical data is stored on all drives and the basic advantage of employing this type of a setup is that if a drive breaks down, the data will still be available on the other ones. Using a RAID also boosts the overall performance because the input and output operations will be spread among a couple of drives. There are several kinds of RAID based on how many hard disks are used, whether writing is carried out on all the drives in real time or just on one, and how the info is synced between the drives - whether it's written in blocks on one drive after another or it is mirrored from one on the others. All these factors show that the error tolerance as well as the performance between the various RAID types can differ.
RAID in Cloud Hosting
The advanced cloud web hosting platform where all cloud hosting accounts are created uses fast SSD drives rather than the classic HDDs, and they function in RAID-Z. With this setup, a number of hard disk drives function together and at least a single one is a dedicated parity disk. Simply put, when data is written on the rest of the drives, it is copied on the parity one adding an extra bit. This is performed for redundancy as even in case a drive fails or falls out of the RAID for whatever reason, the info can be rebuilt and verified using the parity disk and the data saved on the other ones, thus not a single thing will be lost and there won't be any service disorders. This is another level of security for your info along with the revolutionary ZFS file system that uses checksums to guarantee that all of the data on our servers is undamaged and is not silently corrupted.