Redundant Array of Independent Disks, or RAID, is a method of keeping content on a number of hard disk drives simultaneously. A RAID could be software or hardware depending on the HDDs which are used - physical or logical ones, but what is common between them is the fact that they all perform as just a single unit where information is kept. The biggest advantage of employing a RAID is redundancy since the data on all of the drives will be exactly the same at all times, so even in the event that one of the drives fails for some reason, the info will still be available on the other drives. The overall performance will also improve as the reading and writing processes can be split between different drives, so a single one can't be overloaded. There're different sorts of RAIDs where the capabilities and fault tolerance may differ according to the specific setup - whether information is written on all of the drives in real time or it is written on one drive and afterwards mirrored on another, the number of drives are used for the RAID, and so on.
RAID in Cloud Web Hosting
Our cutting-edge cloud Internet hosting platform where all cloud web hosting accounts are made uses super fast SSD drives rather than the classic HDDs, and they work in RAID-Z. With this setup, a number of hard disk drives operate together and at least a single one is a dedicated parity disk. Put simply, when data is written on the remaining drives, it is cloned 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 thanks to the parity disk and the data stored on the other ones, thus nothing will be lost and there won't be any service interruptions. This is an additional level of protection for your info along with the top-notch ZFS file system that uses checksums to make sure that all of the data on our servers is undamaged and is not silently corrupted.