RAID, which is short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that permits a system to use several hard drives as a single logical unit. Put simply, all drives are used as one and the info on all of them is the same. Such a setup has 2 huge advantages over using a single drive to keep data - the first is redundancy, so if one drive doesn't work, the information will be accessible from the remaining ones, and the second is improved performance since the input/output, or reading/writing operations will be spread among several drives. There're different RAID types in accordance with how many drives are employed, if reading and writing are both handled from all the drives at the same time, if data is written in blocks on one drive after another or is mirrored between drives in the same time, and so on. Determined by the particular setup, the fault tolerance and the performance may vary.
RAID in Hosting
The SSD drives that our cutting-edge cloud hosting platform employs for storage work in RAID-Z. This kind of RAID is created to work with the ZFS file system that runs on the platform and it works by using the so-called parity disk - a special drive where information kept on the other drives is duplicated 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 bad one, the data that will be cloned on it will be recovered from what is stored on the other drives along with the information from the parity disk. This is performed so as to be able to recalculate the bits of each and every file correctly and to authenticate the integrity of the info cloned on the new drive. This is one more level of security for the content that you upload to your hosting account together with the ZFS file system which compares a special digital fingerprint for each file on all drives in real time.
RAID in Semi-dedicated Hosting
The RAID type that we use for the cloud Internet hosting platform where your semi-dedicated hosting account will be created is named RAID-Z. What is different about it is that at least one of the disks is employed as a parity drive. Put simply, whenever any kind of data is duplicated on this specific hard drive, one more bit is included to it and in the event that a malfunctioning disk is changed, the info that will be cloned on it is a mix of the data on the remaining disk drives in the RAID and that on the parity one. This is done to ensure that your information is intact. During this process, your Internet sites will be functioning normally since RAID-Z makes it possible for a whole drive to fail without service disruptions and it simply uses one of the other ones as the main production drive. Employing RAID-Z together with the ZFS file system that uses checksums to ensure that no data will get silently corrupted on our servers, you won't ever have to worry about the integrity of your files.
RAID in VPS Web Hosting
In case you use one of our virtual private server solutions, any content which you upload will be kept on SSD drives which function in RAID. At least a single drive is used for parity to ensure the integrity of your information. In simple terms, this is a special drive where data is copied with one bit added to it. If a disk from the RAID fails, your Internet sites will continue working and when a new disk replaces the flawed one, the bits of the information that will be cloned on it are calculated using the healthy and the parity drives. This way, any probability of corrupting data throughout the process is prevented. We also use regular hard disks which work in RAID for storing backups, so should you include this service to your VPS plan, your site content will be saved on multiple drives and you won't ever have to worry about its integrity even in the event of multiple drive breakdowns.