RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which enables a system to take advantage of many hard drives as one single logical unit. To put it differently, all drives are used as one and the info on all of them is the same. This type of a configuration has two major advantages over using a single drive to store data - the first one is redundancy, so in case one drive breaks down, the info will be accessed from the remaining ones, and the second is better performance because the input/output, or reading/writing operations will be spread among different drives. There're different RAID types in accordance with how many drives are used, if reading and writing are both handled from all the drives concurrently, if data is written in blocks on one drive after another or is mirrored between drives in the same time, etc. Determined by the particular setup, the error tolerance and the performance vary.
RAID in Shared Hosting
The disk drives that we employ for storage with our revolutionary cloud Internet hosting platform are not the traditional HDDs, but super fast solid-state drives (SSD). They function in RAID-Z - a special setup intended for the ZFS file system that we work with. All the content that you upload to the shared hosting account will be saved on multiple disk drives and at least one shall be used as a parity disk. This is a special 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 changed with no service disruptions and the data will be rebuilt on the new drive by recalculating its bits thanks to the data on the parity disk along with that on the other disks. This is done to ensure the integrity of the info and together with the real-time checksum authentication that the ZFS file system performs on all drives, you'll never need to worry about the loss of any data no matter what.
RAID in Semi-dedicated Servers
The RAID type which we employ for the cloud Internet hosting platform where your semi-dedicated server account shall be created is named RAID-Z. What is different about it is that at least 1 of the disks is employed as a parity drive. Put simply, whenever any kind of data is copied on this special disk drive, one more bit is included to it and in the event that a defective disk is changed, the data that will be cloned on it is a mix of the data on the other hard drives in the RAID and that on the parity one. We do this to make sure that your information is intact. Throughout this process, your websites will be functioning normally since RAID-Z enables a whole drive to fail without service interruptions and it simply uses one of the remaining ones as the main production drive. Using RAID-Z together with the ZFS file system which uses checksums to guarantee that no data will get silently corrupted on our servers, you won't have to worry about the integrity of your files.
RAID in VPS Servers
The physical servers where we make VPS server work with quick SSD drives which will increase the speed of your sites substantially. The disk drives function in RAID to ensure that you will not lose any data as a result of a power loss or a hardware failure. The production servers use many different drives where the info is stored and one disk is used for parity i.e. one bit is added to all of the data copied on it, which makes it much easier to recover the content without any loss if a main drive stops working. In case you take advantage of our backup service, the information will be kept on an independent machine which uses standard hard-disk drives and though there is no parity one in this case, they are also in a RAID to ensure that we will have a backup copy of your content at all times. With this configuration your info will always be safe since it will be available on a lot of disk drives.