Redundant Array of Independent Disks, or RAID, is a way of storing content on multiple hard disks at the same time. A RAID could be software or hardware depending on the drives which are used - physical or logical ones, but what’s common between them is that they all work as a single unit where your information is saved. The key advantage of employing a RAID is redundancy since the data on all of the drives will be the same all of the time, so even in the event that a drive fails for whatever reason, the data will still be present on the rest of the drives. The overall performance is also enhanced because the reading and writing processes could be split between a number of drives, so a single one will never be overloaded. There're different kinds of RAIDs where the performance and fault tolerance may differ depending on the particular setup - whether your data is written on all of the drives real-time or it is written on one drive and then mirrored on another, the number of drives are used for the RAID, etcetera.
RAID in Cloud Hosting
Our cutting-edge cloud hosting platform where all cloud hosting accounts are generated employs quick SSD drives as opposed to the classic HDDs, and they function in RAID-Z. With this setup, several hard disk drives operate together and at least 1 is a dedicated parity disk. Basically, when data is written on the other drives, it is copied on the parity one adding an extra bit. This is done for redundancy as even if a drive fails or falls out of the RAID for whatever reason, the information can be rebuilt and verified thanks to the parity disk and the data stored on the other ones, which means that absolutely nothing will be lost and there won't be any service disturbances. This is another level of security for your info in addition to the revolutionary ZFS file system which uses checksums to guarantee that all data on our servers is intact and is not silently corrupted.
RAID in Semi-dedicated Servers
The SSD drives which are used for keeping any website content uploaded to the semi-dedicated server accounts which we provide function in RAID-Z. This is a specific configuration where one or more disk drives are employed for parity i.e. the system will add an extra bit to any data cloned on such a disk drive. In case that a disk fails and is replaced with another one, what data will be duplicated on the latter will be a combination calculated between the data on the other disks and that on the parity one. This is done to ensure that the data on the new drive shall be correct. During the procedure, the RAID will continue operating normally and the problematic drive will not have an impact on the normal operation of your websites in any way. Working with SSDs in RAID-Z is a fantastic addition to the ZFS file system that runs on our cutting-edge cloud platform with regards to preserving the integrity of your files as ZFS uses special digital identifiers named checksums in order to prevent silent data corruption.
RAID in VPS Servers
The SSD drives that we use on the physical machines where we create VPS servers work in RAID to make sure that any content you upload will be available and intact all the time. At least 1 drive is employed for parity - one bit of info is added to any data cloned on it. In the event that a main drive stops working, it is changed and the data that will be copied on it is calculated between the remaining drives and the parity one. It's done this way to make sure that the correct data is copied and that no file is corrupted as the new drive will be included in the RAID afterwards. Also, we use hard disks operating in RAID on the backup servers, so in the event that you add this upgrade to your VPS package, you'll use an even more reliable hosting service because your content will be available on multiple drives regardless of any sort of unpredicted hardware failure.