RAID, or Redundant Array of Independent Disks, is a technology of storing data on a number hard disks which function together as one logical unit. The drives could be physical or logical i.e. in the second case one single drive is divided into separate ones via virtualization software. Either way, identical data is saved on all drives and the main benefit of using this type of a setup is that in case a drive stops working, the data will still be available on the remaining ones. Employing a RAID also enhances the performance as the input and output operations will be spread among a few drives. There are several types of RAID depending on how many hard drives are used, whether writing is done on all drives in real time or just on one, and how the info is synced between the drives - whether it is recorded in blocks on one drive after another or it is mirrored from one on the others. All these factors suggest that the error tolerance and the performance between the various RAID types can vary.
RAID in Cloud Website Hosting
All content which you upload to your new cloud website hosting account will be placed on quick SSD drives which work in RAID-Z. This configuration is built to work with the ZFS file system which runs on our cloud web 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 ensure the integrity of the data. With RAID-Z, the information is stored on a number of disks and at least one of them is a parity disk - whenever info is written on it, an extra bit is added, so in case any drive stops working for whatever reason, the integrity of the info can be verified by recalculating its bits in accordance with what is saved on the production disks and on the parity one. With RAID-Z, the functioning of our system will never be interrupted and it'll continue functioning effectively until the problematic drive is changed and the data is synced on it.