RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that permits a system to employ a number of hard drives as a single logical unit. To put it differently, all the drives are used as one and the information on all of them is the same. This kind of a configuration has two huge advantages over using a single drive to keep data - the first is redundancy, so in the event that one drive doesn't work, the info will be accessible from the remaining ones, and the second is better performance as the input/output, or reading/writing operations will be spread among multiple drives. You can find different RAID types in accordance with how many drives are employed, if reading and writing are both done from all the drives concurrently, whether data is written in blocks on one drive after another or is mirrored between drives in the same time, etcetera. Based on the exact setup, the fault tolerance and the performance could differ.
RAID in Shared Web Hosting
The SSD drives that our cutting-edge cloud Internet hosting platform employs for storage work in RAID-Z. This type of RAID is created to work with the ZFS file system which runs on the platform and it takes advantage of the so-called parity disk - a specific drive where info saved on the other drives is cloned with an additional bit added to it. If one of the disks stops working, your Internet sites shall continue working from the other ones and after we replace the bad one, the info which will be copied on it will be recovered from what is stored on the remaining drives together with the information from the parity disk. This is performed so as to be able to recalculate the bits of every single file adequately and to confirm the integrity of the information duplicated on the new drive. This is another level of security for the content which you upload to your shared web hosting account in addition to the ZFS file system that analyzes a unique digital fingerprint for each and every file on all the hard 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 known as RAID-Z. What's different about it is that at least one of the disks is used as a parity drive. Simply put, whenever any kind of data is cloned on this specific hard drive, one more bit is added to it and if a malfunctioning disk is replaced, the information that will be copied on it is a combination of the data on the remaining drives in the RAID and that on the parity one. This is done to ensure that the information is intact. During this process, your websites will be functioning normally since RAID-Z enables an entire drive to fail without causing any service disruptions and it simply uses one of the remaining ones as the main production drive. Using RAID-Z together with the ZFS file system which uses checksums to guarantee that no data shall get silently corrupted on our servers, you will not have to worry about the integrity of your files.
RAID in VPS Web Hosting
The physical servers where we create virtual private server use extremely fast SSD drives that will boost the speed of your sites significantly. The hard drives operate in RAID to guarantee that you won't lose any info due to a power loss or a hardware breakdown. The production servers employ a variety of drives where the info is kept and one disk is used for parity i.e. one bit is added to all the data copied on it, that makes it easier to restore the site content without loss if a main drive stops working. If you pick our backup service, the information will be kept on a separate machine that uses standard hard-disk drives and though there isn't a parity one in this case, they are also in a RAID to ensure that we will have a backup of your site content all of the time. With this configuration your information will always be safe because it will be available on several drives.