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 employ a number of hard drives as a single logical unit. To put it differently, all the drives are used as one and the data on all of them is the same. Such a setup has two key advantages over using a single drive to save data - the first one is redundancy, so in the event that one drive stops working, the data will be accessible through the others, and the second one is improved performance since the input/output, or reading/writing operations will be spread among several drives. There're different RAID types depending on what number of drives are used, if reading and writing are both performed from all the 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, etcetera. Depending on the exact setup, the error tolerance and the performance vary.
RAID in Hosting
The state-of-the-art cloud hosting platform where all hosting accounts are generated employs super fast SSD drives as opposed to the standard HDDs, and they function in RAID-Z. With this setup, a number of hard disks operate together and at least 1 is a dedicated parity disk. Put simply, when data is written on the rest of the drives, it's cloned on the parity one adding an extra bit. This is done for redundancy as even in case a drive fails or falls out of the RAID for whatever reason, the info can be rebuilt and verified using the parity disk and the data recorded on the other ones, so absolutely nothing will be lost and there will be no service disorders. This is another level of security for your information along with the revolutionary ZFS file system which uses checksums to ensure that all of the data on our servers is undamaged and is not silently corrupted.
RAID in Semi-dedicated Hosting
The SSD drives that are used for holding any website content uploaded to the semi-dedicated hosting accounts that we provide operate in RAID-Z. This is a special setup where one or more disk drives are used for parity i.e. the system will add an additional bit to any data copied on such a drive. In the event that a disk fails and is substituted with another one, what data will be duplicated on the latter will be a mix calculated between the data on the other drives and that on the parity one. This is done to ensure that the information on the new drive shall be correct. During the procedure, the RAID will continue functioning adequately and the problematic drive won't affect the adequate operation of your websites at all. Working with SSDs in RAID-Z is an impressive addition to the ZFS file system that runs on our revolutionary cloud platform with respect to preserving the integrity of your files since ZFS uses special digital identifiers identified as checksums to avoid silent data corruption.