RAID, which stands short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which makes it possible for 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 data on all of them is identical. This type of a configuration has two major advantages over using just a single drive to keep data - the first is redundancy, so in case one drive doesn't work, the information will be accessible from the remaining ones, and the second is better performance since the input/output, or reading/writing operations will be distributed among multiple drives. You can find different RAID types in accordance with what amount of drives are employed, if reading and writing are both handled from all of the drives at the same time, whether 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 exact setup, the fault tolerance and the performance could differ.
RAID in Cloud Hosting
All content that you upload to your new cloud hosting account will be held on quick SSD drives which work in RAID-Z. This configuration is built to work with the ZFS file system that runs on our cloud hosting platform and it adds one more level of security for your site content in addition to the real-time checksum authentication that ZFS uses to guarantee the integrity of the data. With RAID-Z, the info is stored on a couple of disks and at least 1 is a parity disk - whenever info is recorded on it, an additional bit is added, so if any drive stops functioning for some reason, the integrity of the information can be verified by recalculating its bits based on what is saved on the production hard disks and on the parity one. With RAID-Z, the functioning of our system will never be interrupted and it'll continue operating effectively until the faulty drive is replaced and the data is synchronized on it.