RAID, or Redundant Array of Independent Disks, is a technology for storing data on multiple hard disk drives which operate together as a single logical unit. The drives could be physical or logical i.e. in the latter case one single drive is divided into independent ones through virtualization software. In any case, the same information is stored on all drives and the key benefit of employing such a setup is that in the event that a drive stops working, the data will still be available on the other ones. Employing a RAID also enhances the overall performance since the input and output operations will be spread among a number of drives. There are several kinds of RAID dependant upon how many drives are used, whether writing is done on all the drives in real time or just on one, and how the information is synchronized between the drives - whether it's recorded in blocks on one drive after another or it is mirrored from one on the others. All these factors show that the fault tolerance and the performance between the different RAID types may vary.

RAID in Shared Hosting

Our state-of-the-art cloud Internet hosting platform where all shared hosting accounts are made employs fast SSD drives as an alternative to the traditional HDDs, and they function in RAID-Z. With this setup, a number of hard disks operate together and at least one of them is a dedicated parity disk. Basically, when data is written on the rest of the drives, it's duplicated on the parity one adding an extra bit. This is performed for redundancy as even in case some 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 saved on the other ones, therefore not a thing will be lost and there won't be any service disturbances. This is another level of protection for your data in addition to the state-of-the-art ZFS file system that uses checksums to make sure that all data on our servers is undamaged and is not silently corrupted.

RAID in Semi-dedicated Hosting

The SSD drives that are used for keeping any website content uploaded to the semi-dedicated hosting accounts that we provide work in RAID-Z. This is a specific setup where one or more drives are employed for parity i.e. the system will add an additional bit to any data duplicated on such a drive. In the event that a disk fails and is replaced with a new one, what data will be cloned on the latter shall be a combination calculated between the data on the other disks and that on the parity one. This is done to guarantee that the information on the new drive will be correct. Throughout the procedure, the RAID will continue operating adequately and the problematic drive won't have an effect on the proper operation of your sites at all. Working with SSDs in RAID-Z is an outstanding addition to the ZFS file system that runs on our revolutionary cloud platform with respect to preserving the integrity of your files because ZFS uses specific digital identifiers referred to as checksums so as to prevent silent data corruption.

RAID in VPS Hosting

The SSD drives that we use on the physical machines where we create virtual private servers work in RAID to make sure that any content you upload will be available and intact all of the time. At least 1 drive is used for parity - one bit of info is added to any data copied on it. In case a main drive breaks down, it is changed and the info that will be duplicated on it is calculated between the rest of the drives and the parity one. This is done to ensure that the right information is copied and that no file is corrupted because the new drive will be used in the RAID afterwards. We also use hard drives operating in RAID on the backup servers, so if you add this upgrade to your VPS plan, you shall use an even more reliable Internet hosting service as your content will be available on multiple drives irrespective of any unpredicted hardware malfunction.