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 a number of hard drives as a single logical unit. Put simply, all the drives are used as one and the info on all of them is the same. This kind of a setup has 2 key advantages over using a single drive to store data - the first one is redundancy, so in case one drive breaks down, the data will be accessible from the remaining ones, and the second one is improved performance because the input/output, or reading/writing operations will be distributed among a number of drives. There are different RAID types depending on what amount of drives are employed, whether reading and writing are both handled from all of the drives simultaneously, if data is written in blocks on one drive after another or is mirrored between drives in the same time, etcetera. According to the exact setup, the error tolerance and the performance may vary.
RAID in Cloud Hosting
All of the content which you upload to your new cloud hosting account will be saved on quick SSD drives that operate in RAID-Z. This configuration is built to employ the ZFS file system which runs on our cloud hosting platform and it adds another level of protection 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 couple of disks and at least one is a parity disk - whenever information is written on it, an extra bit is added, so in the event that any drive stops working for some reason, the stability of the data can be verified by recalculating its bits based on what is kept on the production hard disks and on the parity one. With RAID-Z, the functioning of our system won't be interrupted and it will continue operating effectively until the faulty drive is changed and the data is synced on it.