RAID, or Redundant Array of Independent Disks, is a technology for keeping data on multiple hard drives which work together as one single logical unit. The drives could be physical or logical i.e. in the aforementioned case a single drive is split into different ones through virtualization software. In any case, the same data is stored on all the drives and the main benefit of employing such a setup is that if a drive breaks down, the data shall still be available on the other ones. Employing a RAID also boosts the overall performance since the input and output operations will be spread among a couple of 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 data is synced between the hard drives - whether it is recorded in blocks on one drive after another or it is mirrored from one on the others. These factors imply that the error tolerance as well as the performance between the various RAID types may vary.
RAID in Cloud Web Hosting
All of the content which you upload to your new cloud web hosting account will be placed on fast SSD drives that operate in RAID-Z. This setup is built to employ the ZFS file system that runs on our cloud Internet hosting platform and it adds one more level of security for your website content in addition to 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 information is written on it, an additional bit is added, so in the event that any drive fails for whatever reason, the stability of the information can be verified by recalculating its bits based on what is kept 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 working flawlessly until the problematic drive is changed and the data is synced on it.