RAID, or Redundant Array of Independent Disks, is a technology for keeping data on several hard disk drives that work together as one logical unit. The drives could be physical or logical i.e. in the aforementioned case one single drive is divided into different ones via virtualization software. In any case, exactly the same data is kept on all the drives and the key benefit of employing this kind of a setup is that in the event that a drive stops working, the data will remain available on the other ones. Employing a RAID also enhances the overall performance because the input and output operations will be spread among several drives. There are several kinds of RAID depending on how many drives are used, whether writing is carried out on all of the drives in real time or just on a single one, and how the data is synced between the hard drives - whether it's recorded in blocks on one drive after another or all of it is mirrored from one on the others. All these factors mean that the fault tolerance and the performance between the different RAID types can vary.

RAID in Cloud Web Hosting

The SSD drives which our cutting-edge cloud Internet hosting platform employs for storage operate in RAID-Z. This sort of RAID is intended to work with the ZFS file system that runs on the platform and it employs the so-called parity disk - a special drive where data saved on the other drives is cloned with an additional bit added to it. In the event that one of the disks stops working, your websites will continue working from the other ones and after we replace the malfunctioning one, the info which will be copied on it will be recovered from what is stored on the rest of the drives along with the data from the parity disk. This is performed so as to be able to recalculate the elements of each and every file correctly and to validate the integrity of the information cloned on the new drive. This is another level of security for the information which you upload to your cloud web hosting account along with the ZFS file system which compares a special digital fingerprint for each file on all disk drives in real time.

RAID in Semi-dedicated Hosting

The RAID type which we use for the cloud web hosting platform where your semi-dedicated hosting account shall be created is referred to as RAID-Z. What's different about it is that at least 1 of the disks is employed as a parity drive. In simple terms, whenever any data is duplicated on this particular hard drive, one more bit is added to it and if a problematic disk is changed, the data that will be duplicated on it is a combination of the data on the other drives in the RAID and that on the parity one. We do this to guarantee that your info is intact. Throughout this process, your websites will be functioning normally because RAID-Z makes it possible for a whole drive to fail without any service interruptions and it simply uses one of the other ones as the main production drive. Using RAID-Z together with the ZFS file system that uses checksums to guarantee that no data shall get silently corrupted on our servers, you won't have to worry about the integrity of your files.