RAID, or Redundant Array of Independent Disks, is a technology of saving data on several hard drives which operate together as one logical unit. The drives could be physical or logical i.e. in the second case a single drive is split into separate ones via virtualization software. Either way, identical information is stored on all the drives and the key benefit of using this kind of a setup is that if a drive stops working, the data will still be available on the other ones. Having 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 disks 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 synchronized between the drives - whether it is recorded in blocks on one drive after another or it is mirrored from one on the others. These factors indicate that the fault tolerance as well as the performance between the various RAID types may differ.

RAID in Semi-dedicated Servers

The info uploaded to any semi-dedicated server account is stored on SSD drives which operate in RAID-Z. One of the drives in such a setup is used for parity - each time data is copied on it, an additional bit is added. If a disk happens to be flawed, it will be removed from the RAID without disturbing the operation of the Internet sites as the data will load from the remaining drives, and when a new drive is included, the information which will be duplicated on it will be a combination between the information on the parity disk and data stored on the other drives in the RAID. That is done to ensure that the data which is being cloned is correct, so once the new drive is rebuilt, it could be integrated into the RAID as a production one. This is an additional warranty for the integrity of your information as the ZFS file system that runs on our cloud web hosting platform analyzes a special checksum of all of the copies of the files on the separate drives in order to avoid any chance of silent data corruption.