RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which allows a system to take advantage of a number of hard drives as one single logical unit. Put simply, all drives are used as one and the data on all of them is identical. Such a setup has 2 major advantages over using a single drive to keep data - the first is redundancy, so if one drive doesn't work, the info will be accessed through the others, and the second is better performance as the input/output, or reading/writing operations will be distributed among multiple drives. There are different RAID types based on what number of drives are used, if reading and writing are both executed from all 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. Determined by the exact setup, the error tolerance and the performance may differ.
RAID in Cloud Hosting
All content that you upload to your new cloud hosting account will be saved on fast SSD drives which function in RAID-Z. This configuration is built to employ the ZFS file system which runs on our cloud web hosting platform and it adds an additional level of security for your content on top of the real-time checksum validation that ZFS uses to guarantee the integrity of the data. With RAID-Z, the data is stored on a number of disks and at least one of them is a parity disk - whenever information is recorded on it, an extra bit is added, so in the event that any drive stops working for whatever reason, the stability of the data can be verified by recalculating its bits based on what is saved on the production hard drives and on the parity one. With RAID-Z, the functioning of our system will not be interrupted and it'll continue working effectively until the malfunctioning drive is replaced and the data is synced on it.