Redundant Array of Independent Disks, or RAID, is a way of storing content on multiple hard disk drives at the same time. A RAID might be software or hardware based on the drives that are used - physical or logical ones, yet what’s common between them is that they all operate as just a single unit where your information is stored. The top advantage of employing a RAID is redundancy because the information on all drives shall be the same at all times, so even if one of the drives fails for some reason, the information will still be present on the remaining drives. The overall performance is also better because the reading and writing processes will be split between various drives, so a single one won't be overloaded. There're different kinds of RAIDs where the efficiency and fault tolerance may differ based on the particular setup - whether information is written on all drives real-time or it is written on a single drive and afterwards mirrored on another, the number of drives are used for the RAID, etcetera.

RAID in Shared Hosting

The SSD drives that our cutting-edge cloud web hosting platform uses for storage operate in RAID-Z. This kind of RAID is created to work with the ZFS file system that runs on the platform and it employs the so-called parity disk - a special drive where data located on the other drives is copied with an additional bit added to it. In case one of the disks fails, your sites shall continue working from the other ones and after we replace the bad one, the info which will be duplicated on it will be recovered from what is stored on the remaining drives as well as the data from the parity disk. This is performed in order to be able to recalculate the elements of every file correctly and to verify the integrity of the data copied on the new drive. This is an additional level of security for the information that you upload to your shared hosting account together with the ZFS file system which analyzes a unique digital fingerprint for each and every file on all the disk drives in real time.

RAID in Semi-dedicated Hosting

The RAID type that we use for the cloud web hosting platform where your semi-dedicated hosting account shall be created is named RAID-Z. What is different about it is that at least one of the disks is employed as a parity drive. Simply put, whenever any kind of data is copied on this special hard drive, one more bit is added to it and in the event that a faulty disk is changed, the information which will be copied on it is a combination of the data on the other drives in the RAID and that on the parity one. It's done this way to guarantee that the info is intact. Throughout this process, your Internet sites will be working normally since RAID-Z makes it possible for an entire drive to fail without causing any service disturbances and it simply works by using one of the remaining ones as the main production drive. Using RAID-Z together with the ZFS file system which uses checksums to guarantee that no data shall get silently corrupted on our servers, you won't need to worry about the integrity of your files.