RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that permits a system to employ a number of hard drives as one single logical unit. Put simply, all of the drives are used as one and the info on all of them is the same. Such a setup has two major advantages over using a single drive to save data - the first one is redundancy, so in the event that one drive fails, the info will be accessible from the remaining ones, and the second is improved performance because the input/output, or reading/writing operations will be distributed among multiple drives. There are different RAID types in accordance with what amount of drives are used, whether reading and writing are both executed from all drives concurrently, if data is written in blocks on one drive after another or is mirrored between drives in the same time, etc. Based on the exact setup, the error tolerance and the performance vary.

RAID in Shared Website Hosting

The drives which we use for storage with our outstanding cloud Internet hosting platform are not the classic HDDs, but fast solid-state drives (SSD). They operate in RAID-Z - a special setup developed for the ZFS file system that we use. All of the content that you upload to the shared website hosting account will be held on multiple hard disks and at least one of them will be employed as a parity disk. This is a special drive where an extra bit is included to any content copied on it. In case a disk in the RAID stops functioning, it'll be replaced with no service disruptions and the data will be rebuilt on the new drive by recalculating its bits thanks to the data on the parity disk plus that on the other disks. This is done to guarantee the integrity of the information and together with the real-time checksum validation which the ZFS file system executes on all drives, you'll never need to be concerned about the loss of any data no matter what.

RAID in Semi-dedicated Hosting

The info uploaded to any semi-dedicated hosting account is kept on SSD drives that function in RAID-Z. One of the drives in type of a configuration is used for parity - each time data is copied on it, an additional bit is added. If a disk happens to be faulty, it will be removed from the RAID without disturbing the functioning of the websites as the data will load from the remaining drives, and when a new drive is added, the data that will be cloned on it will be a mix between the data on the parity disk and data saved on the other hard disks in the RAID. That is done so as to guarantee that the information that is being cloned is accurate, so the moment the new drive is rebuilt, it could be incorporated into the RAID as a production one. This is an additional warranty for the integrity of your information because the ZFS file system which runs on our cloud web hosting platform compares a unique checksum of all the copies of your files on the different drives in order to avoid any probability of silent data corruption.