Redundant Array of Independent Disks, or RAID, is a way of keeping content on multiple hard disks simultaneously. A RAID might be software or hardware based on the HDDs which are used - physical or logical ones, but what is common between them is that they all function as a single unit where your information is kept. The main advantage of using a RAID is redundancy as the data on all drives shall be the same all of the time, so even if some drive fails for some reason, the data will still be available on the rest of the drives. The overall performance is enhanced as well since the reading and writing processes will be split between a number of drives, so a single one won't be overloaded. There're different sorts of RAIDs where the capabilities and fault tolerance may differ according to the specific setup - whether info is written on all of the drives real-time or it's written on a single drive and after that mirrored on another, what number of drives are used for the RAID, etcetera.

RAID in Shared Hosting

The state-of-the-art cloud Internet hosting platform where all shared hosting accounts are created employs quick SSD drives instead of the classic HDDs, and they operate in RAID-Z. With this setup, multiple hard disks operate together and at least one is a dedicated parity disk. Put simply, when data is written on the rest of the drives, it's duplicated on the parity one adding an extra bit. This is done for redundancy as even if some drive fails or falls out of the RAID for whatever reason, the information can be rebuilt and verified using the parity disk and the data saved on the other ones, thus not a single thing will be lost and there will be no service disorders. This is another level of protection for your data along with the cutting-edge ZFS file system that uses checksums to guarantee that all of the data on our servers is undamaged and is not silently corrupted.

RAID in Semi-dedicated Servers

The SSD drives which are used for saving any website content uploaded to the semi-dedicated server accounts that we provide work in RAID-Z. This is a special setup where one or more disk drives are used for parity i.e. the system will add an extra bit to any data duplicated on this type of a drive. If a disk fails and is substituted with a new one, what info will be copied on the latter will be a combination calculated between the data on the other hard disks and that on the parity one. This is done to guarantee that the information on the new drive will be accurate. Throughout the process, the RAID will continue working normally and the faulty drive won't have an impact on the proper operation of your sites at all. Using SSDs in RAID-Z is an impressive addition to the ZFS file system that runs on our state-of-the-art cloud platform in terms of preserving the integrity of your files because ZFS uses specific digital identifiers known as checksums to avoid silent data corruption.

RAID in VPS Servers

The SSD drives which we use on the machines where we set up VPS servers operate in RAID to make sure that any content you upload will be available and intact all the time. At least 1 drive is used for parity - one bit of info is added to any data cloned on it. In the event that a main drive fails, it is replaced and the data which will be copied on it is calculated between the rest of the drives and the parity one. It's done this way to ensure that the needed information is copied and that not a single file is corrupted since the new drive will be used in the RAID afterwards. We also use hard disks 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 because your content will be available on multiple drives regardless of any unforeseen hardware malfunction.