RAID, or Redundant Array of Independent Disks, is a technology of saving data on several hard disks that operate together as one single logical unit. The drives could be physical or logical i.e. in the aforementioned case one drive is split into separate ones through virtualization software. In either case, the same info is saved on all of the drives and the key advantage of employing this kind of a setup is that in the event that a drive fails, the data will remain available on the other ones. Using a RAID also improves the performance as the input and output operations will be spread among a number of drives. There are several kinds of RAID dependant upon how many drives are used, whether writing is carried out on all of the drives in real time or just on a single one, and how the info is synchronized between the drives - whether it is written in blocks on one drive after another or it is mirrored from one on the others. These factors mean that the fault tolerance as well as the performance between the different RAID types may differ.

RAID in Shared Web Hosting

The state-of-the-art cloud Internet hosting platform where all shared web hosting accounts are generated uses fast SSD drives rather than the traditional HDDs, and they function in RAID-Z. With this configuration, multiple hard disk drives work together and at least a single one is a dedicated parity disk. In simple terms, when data is written on the remaining drives, it is copied on the parity one adding an extra bit. This is done for redundancy as even in case a drive fails or falls out of the RAID for some reason, the data can be rebuilt and verified using the parity disk and the data saved on the other ones, which means that nothing will be lost and there will not be any service interruptions. This is another level of security for your info along with the state-of-the-art ZFS file system which uses checksums to make sure that all of the data on our servers is undamaged and is not silently corrupted.

RAID in Semi-dedicated Hosting

The info uploaded to any semi-dedicated hosting account is saved on SSD drives that function in RAID-Z. One of the drives in such a configuration is used for parity - each time data is copied on it, an extra bit is added. In case a disk happens to be faulty, it will be removed from the RAID without interrupting the functioning of the Internet sites as the data will load from the rest of the drives, and when a brand new drive is added, the info which will be cloned on it will be a mix between the info on the parity disk and data saved on the other hard drives in the RAID. This is done to guarantee that the info that is being cloned is correct, so once the new drive is rebuilt, it can be incorporated into the RAID as a production one. This is one more warranty for the integrity of your information as the ZFS file system that runs on our cloud hosting platform analyzes a special checksum of all of the copies of the files on the separate drives in order to avoid any chance of silent data corruption.