RAID, or Redundant Array of Independent Disks, is a technology for keeping data on multiple hard drives that work together as one logical unit. The drives could be physical or logical i.e. in the latter case one single drive is split into separate ones through virtualization software. In any case, the same information is kept on all of the drives and the basic benefit of using such a setup is that in the event that a drive stops working, the data will still be available on the other ones. Employing a RAID also boosts the overall performance as the input and output operations will be spread among a number of drives. There are several kinds of RAID depending on how many hard disks are used, whether writing is performed on all of the drives in real time or just on a single one, and how the information is synchronized between the drives - whether it is recorded in blocks on one drive after another or it is mirrored from one on the others. These factors mean that the error tolerance and the performance between the different RAID types may differ.
RAID in Shared Web Hosting
All content which you upload to your new shared web hosting account will be placed on fast SSD drives which operate in RAID-Z. This setup is built to employ the ZFS file system which runs on our cloud hosting platform and it adds an additional level of protection for your site content in addition to the real-time checksum validation that ZFS uses to ensure the integrity of the data. With RAID-Z, the data is stored on a number of disks and at least one is a parity disk - whenever info is written on it, an additional bit is added, so if any drive stops functioning for some reason, the integrity of the info 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 operation of our system won't be interrupted and it will continue operating smoothly until the faulty drive is changed and the info is synced on it.