RAID, or Redundant Array of Independent Disks, is a technology of saving data on a number hard drives that operate together as one logical unit. The drives can be physical or logical i.e. in the second case one single drive is split into separate ones through virtualization software. In any case, the very same info is kept on all of the drives and the basic advantage of using this type of a setup is that in the event that a drive fails, the data will remain available on the remaining ones. Using a RAID also enhances the overall performance because the input and output operations will be spread among a number of drives. There are several kinds of RAID depending on how many drives are used, whether writing is done on all the drives in real time or just on a single one, and how the info is synchronized between the drives - whether it's written in blocks on one drive after another or all of it is mirrored from one on the others. All these factors show that the error tolerance as well as the performance between the various RAID types can differ.
RAID in Cloud Website Hosting
The SSD drives which our cutting-edge cloud web hosting platform employs for storage operate in RAID-Z. This kind 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 specific drive where info kept on the other drives is copied with an additional bit added to it. In the event that one of the disks fails, your websites will continue working from the other ones and after we replace the faulty one, the data that will be duplicated on it will be recovered from what is stored on the remaining drives along with the information from the parity disk. This is performed in order to be able to recalculate the elements of every file adequately and to authenticate the integrity of the info copied on the new drive. This is one more level of security for the info which you upload to your cloud website hosting account in addition to the ZFS file system which compares a unique digital fingerprint for each file on all drives in real time.