RAID, or Redundant Array of Independent Disks, is a technology for storing data on multiple hard disk drives that function together as one single logical unit. The drives could be physical or logical i.e. in the aforementioned case a single drive is divided into separate ones using virtualization software. In any case, the same info is stored on all drives and the basic advantage of employing this type of a setup is that if a drive fails, the data will still be available on the remaining ones. Using a RAID also improves the performance because 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 carried out on all of the drives in real time or just on one, and how the data is synchronized between the hard drives - whether it is written in blocks on one drive after another or it is mirrored from one on the others. These factors suggest that the fault tolerance as well as the performance between the different RAID types may vary.

RAID in Semi-dedicated Servers

The data uploaded to any semi-dedicated server account is kept on SSD drives which operate in RAID-Z. One of the drives in this kind of a setup is used for parity - each time data is copied on it, an extra bit is added. In case a disk happens to be problematic, it will be removed from the RAID without disturbing the work of the Internet sites as the data will load from the rest of the drives, and when a new drive is included, the info that will be copied on it will be a combination between the data on the parity disk and data kept on the other hard disks in the RAID. This is done to ensure that the data which is being copied is accurate, so as soon as the new drive is rebuilt, it could be incorporated into the RAID as a production one. This is one more guarantee for the integrity of your data since the ZFS file system that runs on our cloud Internet hosting platform compares a unique checksum of all copies of your files on the separate drives to be able to avoid any possibility of silent data corruption.

RAID in VPS Servers

The physical servers where we make VPS server use extremely fast SSD drives that will raise the speed of your sites significantly. The drives operate in RAID to ensure that you will not lose any info due to a power loss or a hardware malfunction. The production servers use many different drives where the information is kept and one disk is used for parity i.e. one bit is added to all the info copied on it, which makes it much easier to restore the website content without loss in case a main drive stops working. If you pick our backup service, your information will be stored on a separate machine that uses standard hard-disk drives and though there is no parity one in this case, they are also in a RAID to make sure that we will have a backup of your content all the time. With this kind of setup your data will always be safe since it will be available on several drives.