RAID, or Redundant Array of Independent Disks, is a technology of storing data on multiple hard disk drives which work together as one logical unit. The drives could be physical or logical i.e. in the second case one single drive is split into different ones through virtualization software. In any case, the same data is saved on all of the drives and the main advantage of employing this type of a setup is that in the event that a drive stops working, the data will still be available on the other ones. Having a RAID also improves the performance as the input and output operations will be spread among a few drives. There are several types of RAID dependant upon how many drives are used, whether writing is carried out on all drives in real time or just on a single one, and how the info is synced between the hard drives - whether it is 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 as well as the performance between the various RAID types may vary.

RAID in Shared Hosting

The SSD drives that our cutting-edge cloud Internet hosting platform uses for storage function in RAID-Z. This kind of RAID is designed to work with the ZFS file system which runs on the platform and it takes advantage of the so-called parity disk - a specific drive where information stored on the other drives is copied with an additional bit added to it. In case one of the disks stops functioning, your sites shall continue working from the other ones and once we replace the malfunctioning one, the data that will be cloned on it will be recovered from what is stored on the remaining drives along with the info from the parity disk. This is performed so as to be able to recalculate the bits of every file properly and to validate the integrity of the information cloned on the new drive. This is another level of security for the information you upload to your shared hosting account together with the ZFS file system which analyzes a unique digital fingerprint for each and every file on all disk drives in real time.