RAID, which stands short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that permits a system to use several hard drives as one single logical unit. Put simply, all of the drives are used as one and the information on all of them is the same. This kind of a setup has 2 huge advantages over using just a single drive to save data - the first one is redundancy, so in case one drive breaks down, the data will be accessed through the others, and the second is improved performance because the input/output, or reading/writing operations will be spread among multiple drives. There're different RAID types based on how many drives are used, if reading and writing are both done from all the drives at the same time, whether data is written in blocks on one drive after another or is mirrored between drives in the same time, and so on. According to the exact setup, the error tolerance and the performance could differ.

RAID in Shared Hosting

The disk drives that we employ for storage with our revolutionary cloud hosting platform are not the traditional HDDs, but high-speed solid-state drives (SSD). They function in RAID-Z - a special setup created for the ZFS file system that we use. All of the content that you upload to the shared hosting account will be kept on multiple drives and at least one will be used as a parity disk. This is a special drive where an extra bit is included to any content copied on it. If a disk in the RAID fails, it'll be replaced without any service disruptions and the data will be rebuilt on the new drive by recalculating its bits using the data on the parity disk plus that on the remaining disks. This is done in order to ensure the integrity of the information and together with the real-time checksum verification which the ZFS file system runs on all drives, you'll never have to worry about the loss of any data no matter what.

RAID in Semi-dedicated Servers

The SSD drives that are used for holding any website content uploaded to the semi-dedicated server accounts that we provide work in RAID-Z. This is a specific configuration where one or more hard drives are used for parity i.e. the system will include an additional bit to any data copied on this kind of a drive. In case that a disk fails and is replaced with a new one, what info will be duplicated on the latter will be a combination calculated between the data on the other disks and that on the parity one. This is done to ensure that the information on the new drive shall be correct. Throughout the process, the RAID will continue functioning adequately and the malfunctioning drive will not have an impact on the adequate operation of your websites by any means. Using SSDs in RAID-Z is an outstanding addition to the ZFS file system which runs on our cutting-edge cloud platform in terms of preserving the integrity of your files as ZFS uses unique digital identifiers referred to as checksums to avoid silent data corruption.

RAID in VPS Servers

The SSD drives that we use on the machines where we set up VPS servers work in RAID to ensure that any content which you upload will be available and intact all of the time. At least a single drive is employed for parity - one bit of information is added to any data copied on it. If a main drive breaks down, it is replaced and the information that will be cloned on it is calculated between the rest of the drives and the parity one. It's done this way to ensure that the right data is copied and that not a single file is corrupted since the new drive will be included in the RAID afterwards. In addition, we use hard disks working in RAID on the backup servers, so if you add this upgrade to your VPS package, you shall use an even more reliable web hosting service because your content will be available on multiple drives irrespective of any sudden hardware malfunction.