RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which enables a system to use multiple hard drives as a single logical unit. Simply put, all drives are used as one and the information on all of them is identical. This kind of a configuration has two major advantages over using a single drive to save data - the first one is redundancy, so in the event that one drive fails, the information will be accessed through the remaining ones, and the second one is improved performance because the input/output, or reading/writing operations will be distributed among several drives. There are different RAID types depending on the number of drives are used, whether reading and writing are both executed from all the drives at the same time, if data is written in blocks on one drive after another or is mirrored between drives in the same time, etcetera. According to the exact setup, the error tolerance and the performance may vary.
RAID in Shared Web Hosting
All content which you upload to your new shared web hosting account will be stored on fast SSD drives which operate in RAID-Z. This configuration is built to use the ZFS file system which runs on our cloud web hosting platform and it adds an additional level of protection for your content on top of the real-time checksum authentication that ZFS uses to guarantee the integrity of the data. With RAID-Z, the data is stored on several disks and at least 1 is a parity disk - whenever information is written on it, an additional bit is added, so if any drive stops functioning for some reason, the stability of the data can be verified by recalculating its bits in accordance with what is stored on the production hard drives and on the parity one. With RAID-Z, the operation of our system will never be interrupted and it'll continue operating smoothly until the faulty drive is replaced and the data is synchronized on it.