RAID, or Redundant Array of Independent Disks, is a technology for storing data on several hard disk drives that work together as a single logical unit. The drives could be physical or logical i.e. in the latter case one drive is divided into separate ones via virtualization software. In any case, exactly the same info is stored on all drives and the main benefit of employing such a setup is that in the event that a drive breaks down, the data shall still be available on the remaining ones. Employing a RAID also boosts the overall performance as the input and output operations will be spread among a number of drives. There are several types of RAID depending on how many drives are used, whether writing is done on all drives in real time or just on one, and how the info is synced between the hard drives - whether it's written in blocks on one drive after another or it is mirrored from one on the others. All these factors indicate that the error tolerance as well as the performance between the different RAID types can differ.
RAID in Cloud Website Hosting
The SSD drives which our cutting-edge cloud Internet hosting platform employs for storage operate in RAID-Z. This sort of RAID is developed to work with the ZFS file system that runs on the platform and it employs the so-called parity disk - a specific drive where info stored on the other drives is duplicated with an extra bit added to it. In case one of the disks stops working, your websites shall continue working from the other ones and after we replace the malfunctioning one, the data which will be cloned on it will be recovered from what is stored on the other drives as well as the information from the parity disk. This is performed so as to be able to recalculate the elements of each file correctly and to validate the integrity of the data cloned on the new drive. This is one more level of security for the content which you upload to your cloud website hosting account together with the ZFS file system which analyzes a special digital fingerprint for each and every file on all of the drives in real time.