RAID, or Redundant Array of Independent Disks, is a technology for keeping data on multiple hard disk drives that function together as a single logical unit. The drives could be physical or logical i.e. in the second case a single drive is split into independent ones through virtualization software. In any case, identical data is kept on all the drives and the key benefit of employing such a setup is that in case a drive fails, the data will still be available on the other ones. Employing a RAID also boosts the overall performance as the input and output operations will be spread among a couple of drives. There are several types of RAID depending on how many drives are used, whether writing is performed on all drives in real time or just on one, and how the information 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 mean that the error tolerance and the performance between the various RAID types may differ.

RAID in Shared Website Hosting

The SSD drives that our cutting-edge cloud hosting platform employs for storage operate in RAID-Z. This sort of RAID is intended to work with the ZFS file system which runs on the platform and it takes advantage of the so-called parity disk - a special drive where data stored on the other drives is cloned with an additional bit added to it. If one of the disks stops working, your websites will continue working from the other ones and once we replace the bad one, the information that will be duplicated on it will be rebuilt from what is stored on the other drives together with the info from the parity disk. This is performed in order to be able to recalculate the elements of each and every file adequately and to authenticate the integrity of the data copied on the new drive. This is another level of security for the info that you upload to your shared website hosting account along with the ZFS file system that analyzes a special digital fingerprint for each file on all disk drives in real time.