RAID, or Redundant Array of Independent Disks, is a technology for keeping data on a number hard disk drives which function together as one logical unit. The drives could be physical or logical i.e. in the latter case one single drive is split into different ones via virtualization software. In any case, the same info is kept on all drives and the basic advantage of employing this type of a setup is that in the event that a drive breaks down, the data shall still be available on the other ones. Employing a RAID also boosts the performance because the input and output operations will be spread among several drives. There are several kinds of RAID based on how many hard drives are used, whether writing is done on all of the drives in real time or just on a single one, and how the information is synced between the hard 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 error tolerance and the performance between the various RAID types can differ.
RAID in Cloud Hosting
Any content which you upload to your new cloud hosting account will be placed on quick SSD drives which function in RAID-Z. This setup is built to employ the ZFS file system which runs on our cloud web hosting platform and it adds one more level of protection for your content in addition to the real-time checksum validation that ZFS uses to ensure the integrity of the data. With RAID-Z, the info is saved on a couple of disks and at least one is a parity disk - whenever info is recorded on it, an extra bit is added, so if any drive fails for some reason, the stability of the data can be verified by recalculating its bits based on what is stored on the production drives and on the parity one. With RAID-Z, the functioning of our system will not be interrupted and it will continue functioning efficiently until the problematic drive is replaced and the data is synced on it.