RAID, or Redundant Array of Independent Disks, is a technology of storing data on a number hard disk drives that work together as one single logical unit. The drives can be physical or logical i.e. in the aforementioned case one single drive is split into individual ones using virtualization software. In any case, the very same information is stored on all the drives and the key advantage of employing such a setup is that if a drive stops working, the data shall still be available on the remaining ones. Having a RAID also boosts the overall performance as the input and output operations will be spread among a few drives. There are several kinds of RAID depending on how many hard drives are used, whether writing is performed on all the drives in real time or just on a single one, and how the info is synchronized between the hard drives - whether it's written in blocks on one drive after another or it is mirrored from one on the others. All these factors imply that the error tolerance as well as the performance between the different RAID types can differ.

RAID in Hosting

The hard disks which we use for storage with our state-of-the-art cloud hosting platform are not the classic HDDs, but high-speed solid-state drives (SSD). They work in RAID-Z - a special setup developed for the ZFS file system which we work with. All the content that you add to your hosting account will be kept on multiple drives and at least one will be employed as a parity disk. This is a specific drive where an additional bit is added to any content copied on it. In the event that a disk in the RAID stops functioning, it'll be changed without service disruptions and the info will be recovered on the new drive by recalculating its bits using the data on the parity disk plus that on the other disks. This is done to guarantee the integrity of the information and along with the real-time checksum authentication that the ZFS file system executes on all drives, you will never have to concern yourself with losing any information no matter what.

RAID in Semi-dedicated Servers

If you host your sites within a semi-dedicated server account from our company, all the content that you upload will be held on SSD drives which operate in RAID-Z. With this kind of RAID, at least one of the hard disks is used for parity - when data is synchronized between the drives, an additional bit is added to it on the parity one. The purpose behind this is to ensure the integrity of the information which is copied to a new drive in case one of the hard drives in the RAID stops working since the website content being copied on the brand new disk is recalculated from the data on the standard hard drives and on the parity one. An additional advantage of RAID-Z is that even if a disk drive stops functioning, the system can easily switch to a different one right away without service interruptions of any type. RAID-Z adds an extra level of safety for the content which you upload on our cloud web hosting platform along with the ZFS file system which uses unique checksums to authenticate the integrity of each file.

RAID in VPS Servers

The SSD drives that we use on the machines where we generate VPS servers work in RAID to make sure that any content that you upload will be available and intact all the time. At least 1 drive is employed for parity - one bit of info is added to any data copied on it. In case a main drive fails, it is replaced and the information that will be duplicated on it is calculated between the remaining drives and the parity one. It's done this way to ensure that the needed info is copied and that no file is corrupted because the new drive will be a part of the RAID afterwards. We also use hard disk drives functioning in RAID on the backup servers, so in the event that you add this upgrade to your VPS plan, you'll use an even more reliable hosting service as your content will be available on multiple drives regardless of any type of unpredicted hardware failure.