RAID, which is short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that enables a system to employ many hard drives as a single logical unit. Simply put, all the drives are used as one and the information on all of them is the same. Such a configuration has 2 key advantages over using a single drive to store data - the first one is redundancy, so if one drive doesn't work, the info will be accessed through the remaining ones, and the second is improved performance because the input/output, or reading/writing operations will be spread among multiple drives. There are different RAID types based on the number of drives are employed, if reading and writing are both executed from all of the drives at the same time, whether data is written in blocks on one drive after another or is mirrored between drives in the same time, and so on. Based on the particular setup, the fault tolerance and the performance could differ.
RAID in Shared Hosting
The SSD drives which our cutting-edge cloud Internet hosting platform uses for storage work in RAID-Z. This kind of RAID is intended to work with the ZFS file system that runs on the platform and it uses the so-called parity disk - a specific drive where info stored on the other drives is copied with an extra bit added to it. In the event that one of the disks stops functioning, your websites shall continue working from the other ones and after we replace the malfunctioning one, the data which will be copied on it will be recovered from what is stored on the other drives together with the data from the parity disk. This is performed in order to be able to recalculate the bits of every single file correctly and to validate the integrity of the info duplicated on the new drive. This is an additional level of security for the information you upload to your shared hosting account in addition to the ZFS file system which compares a unique digital fingerprint for each file on all of the hard 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 will be created is referred to as RAID-Z. What is different about it is that at least 1 of the disks is employed as a parity drive. Simply put, whenever any kind of data is cloned on this specific drive, one more bit is added to it and if a defective disk is replaced, the information which will be copied on it is a mix of the data on the remaining hard disks in the RAID and that on the parity one. It's done this way to ensure that your info is intact. During this process, your Internet sites will be working normally as RAID-Z allows for a whole drive to fail without service disruptions and it simply uses one of the other ones as the main production drive. Using RAID-Z together with the ZFS file system which 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
The physical servers where we generate virtual private server use super fast SSD drives that will increase the speed of your sites significantly. The hard drives work in RAID to make sure that you will not lose any info because of a power loss or a hardware breakdown. The production servers employ a variety of drives where the data is kept and one disk is used for parity i.e. one bit is added to all the data copied on it, which makes it easier to restore the content without any loss in case a main drive fails. If you take advantage of our backup service, your information will be kept on a separate machine that uses standard hard-disk drives and even though there is no parity one in this case, they are also in a RAID to make sure that we will have a backup copy of your content all the time. With this particular setup your info will always be safe because it will be available on several disk drives.