RAID, which is short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that allows a system to take advantage of many hard drives as a single logical unit. In other words, all the drives are used as one and the info on all of them is the same. This type of a setup has 2 huge advantages over using just a single drive to store data - the first is redundancy, so in the event that one drive breaks down, the info will be accessible through the remaining ones, and the second is better performance because the input/output, or reading/writing operations will be spread among multiple drives. There are different RAID types in accordance with how many drives are used, if reading and writing are both handled from all the drives simultaneously, if data is written in blocks on one drive after another or is mirrored between drives in the same time, and many others. According to the particular setup, the error tolerance and the performance may vary.

RAID in Web Hosting

Any content which you upload to your new web hosting account will be placed on quick SSD drives which work in RAID-Z. This setup is built to employ the ZFS file system that runs on our cloud web hosting platform and it adds an additional level of security for your website content on top of the real-time checksum verification that ZFS uses to guarantee the integrity of the data. With RAID-Z, the info is saved on a number of disks and at least one of them is a parity disk - whenever info is written on it, an additional bit is added, so if any drive fails for some reason, the integrity of the information can be verified by recalculating its bits based on what is stored on the production hard drives and on the parity one. With RAID-Z, the operation of our system will not be interrupted and it will continue working efficiently until the problematic drive is replaced and the information is synchronized on it.