RAID, or Redundant Array of Independent Disks, is a technology of saving data on a number hard disk drives which operate together as one single logical unit. The drives could be physical or logical i.e. in the latter case a single drive is divided into different ones via virtualization software. Either way, exactly the same info is kept on all of the drives and the key benefit of employing such a setup is that in the event that a drive fails, the data shall still be available on the other ones. Using a RAID also enhances the performance since the input and output operations will be spread among several drives. There are several kinds of RAID dependant upon how many drives are used, whether writing is performed on all the drives in real time or just on one, and how the info is synced between the drives - whether it is recorded in blocks on one drive after another or all of it is mirrored from one on the others. These factors show that the error tolerance as well as the performance between the different RAID types can differ.
RAID in Shared Website Hosting
The advanced cloud hosting platform where all shared website hosting accounts are made uses super fast SSD drives as an alternative to the classic HDDs, and they work in RAID-Z. With this setup, multiple hard drives operate together and at least a single one is a dedicated parity disk. In simple terms, when data is written on the rest of the drives, it's copied on the parity one adding an extra bit. This is done for redundancy as even if a drive fails or falls out of the RAID for some reason, the info can be rebuilt and verified using the parity disk and the data stored on the other ones, so not a single thing will be lost and there will be no service disorders. This is one more level of protection for your information along with the revolutionary ZFS file system which uses checksums to make sure that all of the data on our servers is undamaged and is not silently corrupted.