RAID, or Redundant Array of Independent Disks, is a technology of saving data on multiple hard disk drives which function together as one single logical unit. The drives could be physical or logical i.e. in the latter case one single drive is split into independent ones using virtualization software. In either case, the very same information is saved on all drives and the key advantage of employing this type of a setup is that in case a drive fails, the data will still be available on the other ones. Having a RAID also boosts the performance since the input and output operations will be spread among a number of drives. There are several kinds of RAID based on how many hard drives are used, whether writing is carried out on all drives in real time or just on one, and how the data is synced between the hard drives - whether it's recorded in blocks on one drive after another or all of it is mirrored from one on the others. All of these factors suggest that the fault tolerance as well as the performance between the different RAID types can vary.

RAID in Web Hosting

The SSD drives which our cutting-edge cloud hosting platform uses for storage function in RAID-Z. This sort of RAID is developed to work with the ZFS file system that runs on the platform and it takes advantage of the so-called parity disk - a specific drive where information saved on the other drives is copied with an additional bit added to it. In the event that one of the disks stops working, your websites will continue working from the other ones and as soon as we replace the problematic one, the info that will be duplicated on it will be rebuilt from what is stored on the rest of the drives together with the info from the parity disk. This is performed in order to be able to recalculate the bits of every file properly and to verify the integrity of the data copied on the new drive. This is one more level of security for the information you upload to your web hosting account along with the ZFS file system which compares a special digital fingerprint for each file on all the disk drives in real time.

RAID in Semi-dedicated Hosting

The RAID type which we use for the cloud hosting platform where your semi-dedicated hosting account will be created is called RAID-Z. What's different about it is that at least 1 of the disks is employed as a parity drive. Put simply, whenever any data is cloned on this particular hard drive, one more bit is added to it and in the event that a problematic disk is changed, the information which will be duplicated on it is a combination of the data on the remaining hard drives in the RAID and that on the parity one. It's done this way to guarantee that the info is intact. During this process, your Internet sites will be up and running normally as RAID-Z allows for an entire drive to fail without causing any service disruptions and it simply works by using one of the other ones as the main production drive. Using RAID-Z together with the ZFS file system which uses checksums to warrant that no data can get silently corrupted on our servers, you won't ever have to worry about the integrity of your files.

RAID in VPS Web Hosting

The SSD drives that we use on the machines where we set up virtual private servers work in RAID to ensure that any content that you upload will be available and intact at all times. At least one drive is used for parity - one bit of data is added to any data cloned on it. In the event that a main drive stops working, it is replaced and the information which will be duplicated on it is calculated between the other drives and the parity one. It's done this way to ensure that the required info is copied and that no file is corrupted as the new drive will be incorporated into the RAID afterwards. Also, we use hard drives functioning in RAID on the backup servers, so if you add this upgrade to your VPS plan, you will use an even more reliable web hosting service because your content will be available on multiple drives regardless of any kind of unpredicted hardware failure.