Redundant Array of Independent Disks, or RAID, is a way of keeping content on multiple hard disks at the same time. A RAID could be software or hardware based on the HDDs which are used - physical or logical ones, yet what’s common between them is the fact that they all function as just a single unit where information is saved. The top advantage of using a RAID is redundancy as the info on all drives shall be the same all of the time, so even in the event that a drive fails for some reason, the data will still be available on the remaining drives. The overall performance is also better because the reading and writing processes could be split between multiple drives, so a single one will not be overloaded. There are different sorts of RAIDs where the capabilities and fault tolerance may vary depending on the exact setup - whether information is written on all the drives real-time or it is written on a single drive and afterwards mirrored on another, what number of drives are used for the RAID, and many others.
RAID in Web Hosting
The revolutionary cloud web hosting platform where all web hosting accounts are made uses super fast SSD drives instead of the traditional HDDs, and they function in RAID-Z. With this configuration, numerous hard drives function together and at least one is a dedicated parity disk. Put simply, when data is written on the remaining drives, it is duplicated on the parity one adding an extra bit. This is carried out 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 stored on the other ones, therefore not a thing will be lost and there won't be any service disturbances. This is another level of protection for your information together with the revolutionary ZFS file system that uses checksums to ensure that all the data on our servers is intact and is not silently corrupted.