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 a number of 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 the same. This type of a configuration has 2 major advantages over using a single drive to save data - the first is redundancy, so in the event that one drive breaks down, the information will be accessible through the others, and the second one 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 employed, whether reading and writing are both performed from all 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, and so on. Depending on the particular setup, the fault tolerance and the performance may differ.
RAID in Website Hosting
All of the content which you upload to your new website hosting account will be held on quick SSD drives which function in RAID-Z. This configuration is built to use the ZFS file system that runs on our cloud Internet hosting platform and it adds an additional level of protection for your site content on top of the real-time checksum verification that ZFS uses to guarantee the integrity of the data. With RAID-Z, the information is saved on several disks and at least one is a parity disk - whenever info is written on it, an extra bit is added, so if any drive stops functioning for whatever reason, the integrity 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 will continue functioning effectively until the problematic drive is replaced and the information is synchronized on it.