RAID, or Redundant Array of Independent Disks, is a technology of storing data on a number hard disks which function together as one logical unit. The drives could be physical or logical i.e. in the second case a single drive is divided into independent ones via virtualization software. Either way, identical data is kept on all the drives and the key benefit of employing this kind of a setup is that in the event that a drive breaks down, the data will remain available on the other ones. Employing a RAID also enhances the performance as the input and output operations will be spread among several drives. There are several kinds of RAID based on 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 data is synchronized between the hard drives - whether it's written in blocks on one drive after another or all of it is mirrored from one on the others. These factors indicate that the fault tolerance and the performance between the different RAID types can differ.
RAID in Cloud Website Hosting
The advanced cloud hosting platform where all cloud website hosting
accounts are generated employs fast SSD drives rather than the classic HDDs, and they work in RAID-Z. With this setup, numerous hard drives work 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 cloned on the parity one adding an extra bit. This is performed for redundancy as even in case some drive fails or falls out of the RAID for some reason, the information can be rebuilt and verified thanks to the parity disk and the data recorded on the other ones, therefore not a thing will be lost and there will be no service disturbances. This is another level of security for your information in addition to the state-of-the-art ZFS file system which uses checksums to guarantee that all the data on our servers is intact and is not silently corrupted.
RAID in Semi-dedicated Hosting
The SSD drives that are used for keeping any website content uploaded to the semi-dedicated hosting
accounts which we provide function in RAID-Z. This is a special configuration where one or more drives are employed for parity i.e. the system will include an additional bit to any data cloned on this type of a drive. In the event that a disk fails and is replaced with a new one, what data will be cloned on the latter shall be a combination calculated between the data on the remaining disks and that on the parity one. This is done to guarantee that the info on the new drive will be accurate. Throughout the process, the RAID will continue operating adequately and the faulty drive will not impact the adequate operation of your sites in any way. Using SSDs in RAID-Z is an impressive addition to the ZFS file system that runs on our advanced cloud platform with regard to preserving the integrity of your files since ZFS uses special digital identifiers called checksums to prevent silent data corruption.