RAID, or Redundant Array of Independent Disks, is a technology for keeping data on multiple hard drives that operate together as one logical unit. The drives can be physical or logical i.e. in the latter case one drive is split into separate ones through virtualization software. Either way, the same information is kept on all the drives and the key advantage of employing this kind of a setup is that in the event that a drive fails, the data shall still be available on the other ones. Employing a RAID also improves the overall performance as the input and output operations will be spread among a few drives. There are several kinds of RAID dependant upon how many hard drives are used, whether writing is carried out on all drives in real time or just on a single one, and how the info is synced between the drives - whether it's written in blocks on one drive after another or all of it is mirrored from one on the others. All these factors imply that the error tolerance and the performance between the various RAID types may differ.
RAID in Shared Hosting
All content which you upload to your new shared hosting account will be placed on fast SSD drives that 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 an additional level of security for your website content in addition to the real-time checksum validation which ZFS uses to guarantee the integrity of the data. With RAID-Z, the data is stored on a number of disks and at least one of them is a parity disk - whenever information is written on it, an extra bit is added, so in the event that any drive stops working for whatever reason, the stability of the data can be verified by recalculating its bits in accordance with what is saved on the production drives and on the parity one. With RAID-Z, the operation of our system will never be interrupted and it'll continue working effectively until the faulty drive is replaced and the info is synchronized on it.