RAID, or Redundant Array of Independent Disks, is a technology for keeping data on a number hard disk drives which operate together as a single logical unit. The drives can be physical or logical i.e. in the latter case one drive is divided into separate ones via virtualization software. Either way, exactly the same info is kept on all drives and the main benefit of using this kind of a setup is that if a drive breaks down, the data will still be available on the other ones. Having a RAID also improves the performance since the input and output operations will be spread among a few drives. There are several types of RAID depending on how many hard disks are used, whether writing is done on all the drives in real time or just on a single one, and how the information is synchronized between the drives - whether it is written in blocks on one drive after another or all of it is mirrored from one on the others. All of these factors mean that the error tolerance as well as the performance between the various RAID types may vary.

RAID in Shared Hosting

The disk drives which we use for storage with our ground-breaking cloud web hosting platform are not the traditional HDDs, but fast solid-state drives (SSD). They operate in RAID-Z - a special setup designed for the ZFS file system that we use. Any content that you add to the shared hosting account will be kept on multiple hard drives and at least 1 will be used as a parity disk. This is a specific drive where an extra bit is added to any content copied on it. In the event that a disk in the RAID stops functioning, it'll be replaced with no service disturbances and the data will be recovered on the new drive by recalculating its bits thanks to the data on the parity disk plus that on the remaining disks. This is done to ensure the integrity of the information and together with the real-time checksum authentication which the ZFS file system performs on all drives, you'll never need to worry about the loss of any info no matter what.

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 operate in RAID-Z. This is a special setup where one or more hard drives are employed for parity i.e. the system will add an extra bit to any data copied on this kind of a drive. In case that a disk fails and is substituted with another one, what information will be cloned on the latter shall be a mix calculated between the data on the remaining hard disks and that on the parity one. This is done to guarantee that the data on the new drive will be correct. During the process, the RAID will continue operating adequately and the malfunctioning drive won't have an impact on the adequate operation of your Internet sites at all. Working with SSDs in RAID-Z is an amazing addition to the ZFS file system which runs on our top-notch cloud platform in terms of preserving the integrity of your files because ZFS uses specific digital identifiers named checksums so as to avoid silent data corruption.


The SSD drives that we use on the machines where we create virtual private servers work in RAID to ensure that any content which you upload will be available and intact at all times. At least 1 drive is employed for parity - one bit of data is added to any data cloned on it. In case a main drive breaks down, it is replaced and the information which will be cloned on it is calculated between the remaining drives and the parity one. That’s done to make sure that the required info is copied and that no file is corrupted as the new drive will be used in the RAID afterwards. Also, we use hard drives functioning in RAID on the backup servers, so in the event that you add this upgrade to your VPS package, you'll use an even more reliable Internet hosting service since your content will be available on multiple drives irrespective of any sort of sudden hardware malfunction.