RAID, which is 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 the drives are used as one and the data on all of them is identical. Such a configuration has 2 huge advantages over using just a single drive to save data - the first one is redundancy, so in case one drive fails, the information will be accessible through the others, and the second is improved performance since the input/output, or reading/writing operations will be spread among a number of drives. There're different RAID types in accordance with what number of drives are used, if reading and writing are both performed from all the drives simultaneously, if data is written in blocks on one drive after another or is mirrored between drives in the same time, and many others. Based on the particular setup, the fault tolerance and the performance could differ.
RAID in Web Hosting
All of the content which you upload to your new web hosting account will be stored on quick SSD drives that operate in RAID-Z. This setup is built to work with the ZFS file system that runs on our cloud web hosting platform and it adds another level of protection for your content on top of the real-time checksum validation that ZFS uses to ensure the integrity of the data. With RAID-Z, the info is stored on a couple of disks and at least one of them is a parity disk - whenever data is recorded on it, an additional bit is added, so in the event that any drive stops working for whatever reason, the integrity of the info can be verified by recalculating its bits in accordance with what is saved on the production hard disks and on the parity one. With RAID-Z, the operation of our system won't be interrupted and it'll continue working effectively until the faulty drive is replaced and the data is synchronized on it.
RAID in Semi-dedicated Hosting
The SSD drives that are used for holding any website content uploaded to the semi-dedicated hosting accounts which we provide function in RAID-Z. This is a specific setup where one or more hard drives are employed for parity i.e. the system will include an additional bit to any data duplicated on such a disk drive. In the event that a disk fails and is substituted with a new one, what data will be cloned on the latter will be a combination calculated between the data on the other hard disks and that on the parity one. This is done to guarantee that the information on the new drive shall be correct. During the procedure, the RAID will continue working normally and the problematic drive won't have an impact on the adequate operation of your Internet sites in any respect. Using SSDs in RAID-Z is a fantastic addition to the ZFS file system which runs on our top-notch cloud platform in terms of preserving the integrity of your files since ZFS uses special digital identifiers referred to as checksums to prevent silent data corruption.