RAID, or Redundant Array of Independent Disks, is a technology of keeping data on several hard drives that function together as one logical unit. The drives could be physical or logical i.e. in the second case one single drive is split into separate ones through virtualization software. In any case, exactly the same information is stored on all of the drives and the basic benefit of employing this type of a setup is that in the event that a drive breaks down, the data will still be available on the other ones. Having a RAID also improves the overall performance because the input and output operations will be spread among a number of drives. There are several types of RAID depending on how many hard disks are used, whether writing is carried out on all of the drives in real time or just on one, and how the information is synced between the drives - whether it is recorded in blocks on one drive after another or it is mirrored from one on the others. All these factors imply that the fault tolerance as well as the performance between the different RAID types can vary.

RAID in Cloud Website Hosting

The SSD drives that our cutting-edge cloud Internet hosting platform employs for storage function in RAID-Z. This kind of RAID is created to work with the ZFS file system that runs on the platform and it uses the so-called parity disk - a specific drive where data kept on the other drives is duplicated with an extra bit added to it. If one of the disks fails, your sites shall continue working from the other ones and once we replace the problematic one, the data which will be copied on it will be recovered from what is stored on the remaining drives along with the info from the parity disk. This is done so as to be able to recalculate the elements of each and every file adequately and to authenticate the integrity of the info cloned on the new drive. This is an additional level of security for the info that you upload to your cloud website hosting account together with the ZFS file system which analyzes a special digital fingerprint for each and every file on all drives in real time.

RAID in Semi-dedicated Servers

In case you host your sites inside a semi-dedicated server account from our firm, any content that you upload will be held on SSD drives which work in RAID-Z. With this form of RAID, at least one of the hard drives is used for parity - when data is synchronized between the drives, an additional bit is added to it on the parity one. The idea behind this is to ensure the integrity of the data that is cloned to a new drive if one of the disks in the RAID fails because the content being copied on the new disk is recalculated from the info on the standard hard drives and on the parity one. An additional advantage of RAID-Z is that even if a disk drive fails, the system could switch to another one promptly without service disturbances of any sort. RAID-Z adds an additional level of protection for the content that you upload on our cloud Internet hosting platform along with the ZFS file system that uses unique checksums as a way to verify the integrity of each and every file.

RAID in VPS Servers

The SSD drives that we use on the machines where we create VPS servers work in RAID to make sure that any content that 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 the event that a main drive breaks down, it is replaced and the data which will be duplicated on it is calculated between the rest of the drives and the parity one. It's done this way to make sure that the required info is copied and that no file is corrupted because the new drive will be used in the RAID afterwards. We also use hard disk drives working in RAID on the backup servers, so in the event that you add this upgrade to your VPS plan, you shall use an even more reliable hosting service since your content will be available on multiple drives regardless of any unforeseen hardware failure.