Redundant Array of Independent Disks, or RAID, is a method of keeping content on multiple hard drives concurrently. A RAID might be software or hardware based on the HDDs that are used - physical or logical ones, still what is common between them is the fact that they all perform as one single unit where data is stored. The key advantage of employing a RAID is redundancy as the information on all the drives will be identical at all times, so even in the event that a drive fails for some reason, the data will still be present on the rest of the drives. The general performance is also enhanced because the reading and writing processes can be split between different drives, so a single one won't be overloaded. There're different kinds of RAIDs where the effectiveness and fault tolerance can vary according to the specific setup - whether information is written on all drives real-time or it's written on a single drive and afterwards mirrored on another, what number of drives are used for the RAID, and many others.
RAID in Shared Website Hosting
The hard disks that we employ for storage with our innovative cloud Internet hosting platform are not the classic HDDs, but quick solid-state drives (SSD). They work in RAID-Z - a special setup created for the ZFS file system that we work with. All the content that you add to the shared website hosting account will be saved on multiple drives and at least one shall be used as a parity disk. This is a specific drive where an additional bit is included to any content copied on it. In the event that a disk in the RAID stops functioning, it will be replaced with no service interruptions and the information will be rebuilt on the new drive by recalculating its bits thanks to the data on the parity disk plus that on the other disks. This is done in order to ensure the integrity of the info and together with the real-time checksum validation that the ZFS file system runs on all drives, you won't ever need to worry about losing any data no matter what.