RAID, or Redundant Array of Independent Disks, is a technology of saving data on multiple hard disks which operate together as one logical unit. The drives could be physical or logical i.e. in the second case a single drive is divided into separate ones using virtualization software. Either way, exactly the same data is kept on all drives and the basic benefit of employing this type of a setup is that if a drive stops working, the data shall still be available on the remaining ones. Employing a RAID also enhances the performance because the input and output operations will be spread among several drives. There are several kinds of RAID based on how many hard drives are used, whether writing is performed on all the drives in real time or just on one, and how the data is synced between the drives - whether it is written in blocks on one drive after another or it is mirrored from one on the others. All of these factors indicate that the fault tolerance and the performance between the various RAID types could differ.

RAID in Web Hosting

The advanced cloud Internet hosting platform where all web hosting accounts are created employs super fast NVMe drives as an alternative to the traditional HDDs, and they work in RAID-Z. With this setup, multiple hard disks function together and at least one is a dedicated parity disk. Put simply, when data is written on the remaining drives, it is copied on the parity one adding an extra bit. This is carried out 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 practically nothing will be lost and there will not be any service interruptions. This is an additional level of protection for your info in addition to the top-notch ZFS file system that uses checksums to make sure that all data on our servers is intact and is not silently corrupted.