Redundant Array of Independent Disks, or RAID, is a method of storing content on a number of hard disk drives simultaneously. A RAID might be software or hardware depending on the drives which are used - physical or logical ones, still what is common between them is the fact that they all perform as one single unit where info is kept. The biggest advantage of using a RAID is redundancy since the data on all of the drives is the same at all times, so even in case some drive fails for some reason, the data will still be present on the other drives. The general performance is also better as the reading and writing processes could be split between different drives, so a single one won't be overloaded. There're different sorts of RAIDs where the effectiveness and fault tolerance may vary according to the specific setup - whether info is written on all the drives in real time or it's written on one drive and afterwards mirrored on another, what number of drives are used for the RAID, etc.
RAID in Shared Hosting
Our cutting-edge cloud Internet hosting platform where all shared hosting accounts are generated employs quick SSD drives instead of the classic HDDs, and they work in RAID-Z. With this setup, numerous hard disks function together and at least 1 is a dedicated parity disk. Simply put, when data is written on the remaining drives, it is 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 whatever reason, the information can be rebuilt and verified thanks to the parity disk and the data saved on the other ones, so practically nothing will be lost and there will be no service disorders. This is another level of security for your info along with the revolutionary ZFS file system that uses checksums to make sure that all data on our servers is intact and is not silently corrupted.