Redundant Array of Independent Disks, or RAID, is a way of keeping content on multiple hard drives simultaneously. A RAID can be software or hardware depending on the drives that are used - physical or logical ones, yet what’s common between them is the fact that they all function as just one single unit where info is saved. The top advantage of employing a RAID is redundancy as the info on all the drives shall be the same at all times, so even in the event that some drive fails for whatever reason, the information will still be present on the rest of the drives. The general performance is also enhanced since the reading and writing processes could be split between various drives, so a single one won't be overloaded. There are different sorts of RAIDs where the efficiency and fault tolerance can vary depending on the specific setup - whether info is written on all of the drives in real time or it's written on one drive and afterwards mirrored on another, what amount of drives are used for the RAID, etcetera.
RAID in Shared Hosting
The disk drives that we employ for storage with our outstanding cloud hosting platform are not the classic HDDs, but extremely fast solid-state drives (SSD). They work in RAID-Z - a special setup designed for the ZFS file system which we use. All of the content that you add to the shared hosting account will be saved on multiple disk drives and at least 1 shall be employed as a parity disk. This is a special drive where a further bit is added to any content copied on it. If a disk in the RAID fails, it'll be replaced with no service disruptions and the info will be recovered on the new drive by recalculating its bits using the data on the parity disk along with that on the other disks. This is done to guarantee the integrity of the info and together with the real-time checksum authentication that the ZFS file system performs on all drives, you will never need to worry about the loss of any data no matter what.