RAID, or Redundant Array of Independent Disks, is a technology of storing data on multiple hard disk drives that operate together as a single logical unit. The drives could be physical or logical i.e. in the aforementioned case a single drive is divided into individual ones through virtualization software. Either way, exactly the same data is kept on all the drives and the main advantage of employing such a setup is that if a drive fails, the data will still be available on the remaining ones. Employing a RAID also improves the overall performance as the input and output operations will be spread among several drives. There are several types of RAID depending on how many hard drives are used, whether writing is performed on all the drives in real time or just on one, and how the info is synced between the hard drives - whether it is recorded in blocks on one drive after another or it is mirrored from one on the others. These factors suggest that the error tolerance and the performance between the different RAID types can vary.
RAID in Web Hosting
Our cutting-edge cloud web hosting platform where all web hosting accounts are generated employs super fast SSD drives rather than the standard HDDs, and they work in RAID-Z. With this configuration, multiple hard disks function together and at least a single one is a dedicated parity disk. Simply put, when data is written on the other drives, it's copied on the parity one adding an extra bit. This is carried out 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 stored on the other ones, thus not a single thing will be lost and there will not be any service interruptions. This is one more level of protection for your data along with the cutting-edge ZFS file system which uses checksums to ensure that all data on our servers is undamaged and is not silently corrupted.
RAID in Semi-dedicated Servers
The info uploaded to any semi-dedicated server account is stored on SSD drives which operate in RAID-Z. One of the drives in type of a configuration is used for parity - whenever data is cloned on it, an extra bit is added. If a disk happens to be problematic, it will be removed from the RAID without interrupting the functioning of the websites because the data will load from the rest of the drives, and when a brand new drive is included, the information which will be duplicated on it will be a mix between the data on the parity disk and data kept on the other hard disks in the RAID. This is done in order to guarantee that the data which is being copied is correct, so as soon as the new drive is rebuilt, it could be integrated into the RAID as a production one. This is an additional guarantee for the integrity of your information since the ZFS file system which runs on our cloud Internet hosting platform compares a unique checksum of all of the copies of your files on the separate drives in order to avoid any possibility of silent data corruption.
RAID in VPS Servers
If you use one of our VPS server plans, any content you upload will be kept on SSD drives that work in RAID. At least 1 drive is intended for parity so as to guarantee the integrity of your information. In simple terms, this is a special drive where information is copied with one bit added to it. In the event that a disk in the RAID stops functioning, your sites will continue working and when a new disk takes the place of the malfunctioning one, the bits of the data that will be cloned on it are calculated using the healthy and the parity drives. That way, any possibility of corrupting data during the process is prevented. We also employ ordinary hard drives that work in RAID for storing backup copies, so should you add this service to your VPS package, your site content will be kept on multiple drives and you'll never need to worry about its integrity even in the event of multiple drive breakdowns.