Redundant Array of Independent Disks, or RAID, is a way of storing content on several hard disks simultaneously. A RAID could be software or hardware based on the hard drives which are used - physical or logical ones, still what is common between them is that they all work as just a single unit where info is saved. The main advantage of employing a RAID is redundancy because the information on all drives is identical at all times, so even in the event that some drive fails for whatever reason, the data will still be available on the remaining drives. The overall performance is also enhanced because the reading and writing processes can be split between a number of drives, so a single one won't be overloaded. There're different sorts of RAIDs where the effectiveness and fault tolerance may vary based on the particular setup - whether info is written on all of the drives in real time or it's written on a single drive and then mirrored on another, what amount of drives are used for the RAID, and so on.
RAID in Hosting
The hard disks which we use for storage with our innovative cloud web hosting platform are not the standard HDDs, but super fast solid-state drives (SSD). They operate in RAID-Z - a special setup intended for the ZFS file system which we work with. All the content that you add to your hosting account will be held on multiple disk 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 case a disk in the RAID stops working, it'll be replaced without any service disturbances and the information will be recovered on the new drive by recalculating its bits using the data on the parity disk plus that on the other disks. This is done to ensure the integrity of the info and along with the real-time checksum authentication that the ZFS file system runs on all drives, you won't ever have to concern yourself with the loss of any data no matter what.
RAID in Semi-dedicated Servers
The SSD drives which are used for saving any content uploaded to the semi-dedicated server accounts which we offer operate in RAID-Z. This is a specific setup where one or more drives are used for parity i.e. the system will include an additional bit to any data duplicated on this kind of a disk drive. In case that a disk fails and is substituted with a new one, what data will be duplicated on the latter shall be a mix calculated between the data on the other disks and that on the parity one. This is done to make sure that the data on the new drive shall be accurate. During the procedure, the RAID will continue working adequately and the problematic drive will not impact the normal operation of your websites at all. Using SSDs in RAID-Z is a superb addition to the ZFS file system which runs on our cutting-edge cloud platform in terms of preserving the integrity of your files as ZFS uses specific digital identifiers called checksums so as to prevent silent data corruption.