RAID, or Redundant Array of Independent Disks, is a technology for storing data on a number hard disk drives that operate together as a single logical unit. The drives could be physical or logical i.e. in the aforementioned case one drive is divided into independent ones using virtualization software. In either case, identical data is stored on all of the drives and the main advantage of using this kind of a setup is that if a drive fails, the data will remain available on the remaining ones. Using a RAID also improves the overall performance since the input and output operations will be spread among several drives. There are several types of RAID dependant upon how many hard drives are used, whether writing is carried out on all of the drives in real time or just on one, and how the info is synced between the drives - whether it's written in blocks on one drive after another or it is mirrored from one on the others. These factors mean that the fault tolerance and the performance between the different RAID types can vary.

RAID in Cloud Website Hosting

Any content that you upload to your new cloud website hosting account will be saved on fast SSD drives which work in RAID-Z. This configuration is built to work with the ZFS file system which runs on our cloud hosting platform and it adds another level of protection for your site content on top of the real-time checksum authentication that ZFS uses to guarantee the integrity of the data. With RAID-Z, the information is saved on a couple of disks and at least 1 is a parity disk - whenever data is written on it, an additional bit is added, so in the event that any drive stops functioning for whatever reason, the integrity of the data can be verified by recalculating its bits based on what is kept on the production hard disks and on the parity one. With RAID-Z, the functioning of our system won't be interrupted and it'll continue functioning flawlessly until the problematic drive is replaced and the data is synchronized on it.

RAID in Semi-dedicated Servers

In case you host your websites in a semi-dedicated server account from our company, any content that you upload will be stored on SSD drives which operate in RAID-Z. With this form of RAID, at least one of the hard drives is used for parity - when data is synced between the hard drives, an extra bit is added to it on the parity one. The reasoning behind this is to guarantee the integrity of the information that is cloned to a brand new drive in case one of the disks in the RAID breaks down as the content being copied on the brand new disk is recalculated from the data on the standard disk drives and on the parity one. An additional advantage of RAID-Z is that even in case a hard drive fails, the system can easily switch to a different one quickly without service interruptions of any kind. RAID-Z adds one more level of safety for the content you upload on our cloud Internet hosting platform together with the ZFS file system which uses unique checksums as a way to authenticate the integrity of each file.