RAID, which stands short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that permits a system to use many hard drives as a single logical unit. Put simply, all drives are used as one and the information on all of them is identical. This type of a setup has 2 huge advantages over using just a single drive to save data - the first one is redundancy, so if one drive stops working, the information will be accessed through the remaining ones, and the second is improved performance since the input/output, or reading/writing operations will be spread among different drives. You can find different RAID types based on the number of drives are used, whether reading and writing are both performed from all the drives concurrently, whether data is written in blocks on one drive after another or is mirrored between drives in the same time, etcetera. Determined by the exact setup, the error tolerance and the performance may vary.
RAID in Cloud Hosting
All the content that you upload to your new cloud hosting account will be stored on fast SSD drives that function in RAID-Z. This configuration is built to work with the ZFS file system that runs on our cloud hosting platform and it adds an additional level of security for your site content on top of the real-time checksum verification which ZFS uses to ensure the integrity of the data. With RAID-Z, the information is saved on several disks and at least one of them is a parity disk - whenever information is written on it, an extra bit is added, so in the event that any drive fails for some reason, the stability of the information can be verified by recalculating its bits based on what is kept on the production hard drives and on the parity one. With RAID-Z, the functioning of our system will never be interrupted and it will continue working flawlessly until the problematic drive is replaced and the information is synced on it.