Redundant Array of Independent Disks, or RAID, is a method of saving content on several hard disks at the same time. A RAID can be software or hardware based on the HDDs which are used - physical or logical ones, however what’s common between them is the fact that they all operate as just a single unit where info is kept. The top advantage of employing a RAID is redundancy as the data on all drives will be the same all the time, so even in the event that a drive fails for whatever reason, the info will still be available on the rest of the drives. The overall performance is enhanced as well as the reading and writing processes could be split between a number of drives, so a single one will not be overloaded. There are different sorts of RAIDs where the capabilities and fault tolerance can vary depending on the particular setup - whether information is written on all of the drives real-time or it's written on a single drive and after that mirrored on another, the number of drives are used for the RAID, etcetera.
RAID in Cloud Hosting
The cutting-edge cloud Internet hosting platform where all cloud hosting
accounts are created employs fast SSD drives as opposed to the traditional HDDs, and they work in RAID-Z. With this configuration, several hard drives function together and at least one is a dedicated parity disk. Simply put, when data is written on the remaining drives, it's duplicated 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 some reason, the data can be rebuilt and verified thanks to the parity disk and the data stored on the other ones, so nothing will be lost and there won't be any service interruptions. This is one more level of protection for your data along with the cutting-edge ZFS file system that uses checksums to ensure that all of the data on our servers is intact and is not silently corrupted.
RAID in Semi-dedicated Servers
The SSD drives that are used for saving any site content uploaded to the semi-dedicated server
accounts that we provide work in RAID-Z. This is a specific setup where one or more drives are used for parity i.e. the system will add an additional bit to any data cloned on this type of a hard drive. If a disk fails and is replaced with another one, what data will be cloned on the latter will be a combination calculated between the data on the remaining drives and that on the parity one. This is done to ensure that the information on the new drive will be correct. Throughout the process, the RAID will continue operating adequately and the problematic drive won't have an effect on the normal operation of your Internet sites in any respect. Working with SSDs in RAID-Z is a fantastic addition to the ZFS file system that runs on our revolutionary cloud platform in terms of preserving the integrity of your files as ZFS uses special digital identifiers identified as checksums so as to avoid silent data corruption.
RAID in VPS Servers
The SSD drives which we use on the machines where we generate VPS servers
function in RAID to ensure that any content that you upload will be available and intact all the time. At least one drive is employed for parity - one bit of info is added to any data cloned on it. In case a main drive fails, it is changed and the information that will be copied on it is calculated between the other drives and the parity one. This is done to make sure that the needed data is copied and that not a single file is corrupted since the new drive will be a part of the RAID afterwards. In addition, we use hard drives working in RAID on the backup servers, so in case you add this upgrade to your VPS package, you'll use an even more reliable Internet hosting service since your content will be available on multiple drives irrespective of any sort of unpredicted hardware failure.