Redundant Array of Independent Disks, or RAID, is a way of saving content on multiple hard disk drives at the same time. A RAID could be software or hardware based on the hard drives which are used - physical or logical ones, but what is common between them is that they all operate as one single unit where data is stored. The key advantage of employing a RAID is redundancy since the information on all the drives will be identical all of the time, so even in case a drive fails for some reason, the information will still be available on the other drives. The overall performance is enhanced as well as the reading and writing processes could be split between various drives, so a single one will never be overloaded. There're different kinds of RAIDs where the effectiveness and fault tolerance may differ based on the particular setup - whether your data is written on all the drives 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 Web Hosting
The hard drives that we employ for storage with our outstanding cloud hosting platform are not the traditional HDDs, but high-speed solid-state drives (SSD). They operate in RAID-Z - a special setup intended for the ZFS file system which we employ. All of the content that you add to your web hosting account will be saved on multiple disk drives and at least one will be used as a parity disk. This is a specific drive where an additional bit is added to any content copied on it. If a disk in the RAID stops working, it'll be changed without service disturbances and the info will be recovered on the new drive by recalculating its bits thanks to the data on the parity disk along with that on the remaining disks. This is done so as to guarantee the integrity of the information and together with the real-time checksum validation which the ZFS file system performs on all drives, you won't ever need to be concerned about the loss of any info no matter what.
RAID in Semi-dedicated Servers
The SSD drives that are used for keeping any content uploaded to the semi-dedicated server accounts which we offer function in RAID-Z. This is a special setup where one or more disk drives are employed for parity i.e. the system will add an additional bit to any data duplicated on this kind of a disk drive. In the event that a disk fails and is substituted with another one, what data will be cloned on the latter will be a combination calculated between the data on the remaining hard disks and that on the parity one. This is done to guarantee that the information on the new drive will be accurate. During the process, the RAID will continue functioning normally and the malfunctioning drive won't have an impact on the normal operation of your Internet sites in any respect. Using SSDs in RAID-Z is an outstanding addition to the ZFS file system which runs on our state-of-the-art cloud platform with respect to preserving the integrity of your files since ZFS uses specific digital identifiers identified as checksums in order to prevent silent data corruption.
RAID in VPS Servers
If you take advantage of one of our VPS server packages, any content you upload will be kept on SSD drives that operate in RAID. At least 1 drive is intended for parity so as to ensure the integrity of the information. In simple terms, this is a special drive where info is copied with one bit added to it. In the event that a disk part of the RAID fails, your Internet sites will continue working and when a new disk replaces the defective one, the bits of the info that will be duplicated on it are calculated using the healthy and the parity drives. By doing this, any potential for corrupting data throughout the process is averted. We also use ordinary hard drives which operate in RAID for storing backups, so if you add this service to your VPS package, your website content will be kept on multiple drives and you won't ever have to worry about its integrity even in the event of multiple drive breakdowns.