RAID, or Redundant Array of Independent Disks, is a technology for storing data on a number hard disk drives that function together as one logical unit. The drives can be physical or logical i.e. in the latter case a single drive is divided into independent ones through virtualization software. In any case, identical information is stored on all the drives and the main advantage of using this type of a setup is that in case a drive breaks down, the data will still be available on the remaining ones. Using a RAID also improves the performance since the input and output operations will be spread among a couple of drives. There are several types of RAID based 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 synchronized between the hard drives - whether it is written in blocks on one drive after another or all of it is mirrored from one on the others. All these factors suggest that the error tolerance as well as the performance between the different RAID types can differ.
RAID in Cloud Hosting
All content that you upload to your new cloud hosting account will be held on quick SSD drives which operate in RAID-Z. This configuration is built to employ the ZFS file system which runs on our cloud Internet hosting platform and it adds one more level of security for your website content on top of the real-time checksum verification which ZFS uses to ensure the integrity of the data. With RAID-Z, the information is stored on a couple of disks and at least 1 is a parity disk - whenever info is written on it, an additional bit is added, so if any drive stops working for whatever reason, the stability of the data can be verified by recalculating its bits based on what is saved on the production disks and on the parity one. With RAID-Z, the functioning of our system won't be interrupted and it will continue working flawlessly until the malfunctioning drive is replaced and the information is synced on it.