What's RAID? Just how does RAID work? Find out about the advantages of using a RAID-equipped server.
RAID, or Redundant Array of Independent Disks, is a technology of storing data on multiple hard disks which function together as one single logical unit. The drives could be physical or logical i.e. in the second case a single drive is split into independent ones via virtualization software. In either case, exactly the same information is saved on all the drives and the main benefit of using this kind of a setup is that if a drive fails, the data will still be available on the other ones. Having a RAID also improves the overall performance as the input and output operations will be spread among several drives. There are several kinds of RAID based on how many drives are used, whether writing is performed on all of the drives in real time or just on 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. All of these factors imply that the error tolerance as well as the performance between the various RAID types may vary.
RAID in Web Hosting
The SSD drives which our cutting-edge cloud hosting platform employs for storage function in RAID-Z. This type of RAID is created to work with the ZFS file system which runs on the platform and it works by using the so-called parity disk - a special drive where data kept on the other drives is duplicated with an extra bit added to it. In case one of the disks stops functioning, your websites shall continue working from the other ones and once we replace the bad one, the data which will be copied on it will be rebuilt from what is stored on the remaining drives together with the info from the parity disk. This is performed in order to be able to recalculate the bits of every single file adequately and to confirm the integrity of the info cloned on the new drive. This is one more level of security for the info you upload to your web hosting account in addition to the ZFS file system that analyzes a special digital fingerprint for each and every file on all the hard drives in real time.