RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that makes it possible for a system to use 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. This type of a configuration has 2 major advantages over using just a single drive to keep data - the first one is redundancy, so in case one drive breaks down, the information will be accessible from the others, and the second one is improved performance since the input/output, or reading/writing operations will be spread among a number of drives. You can find different RAID types in accordance with what amount of drives are used, whether reading and writing are both done from all of 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 particular setup, the error tolerance and the performance could differ.
RAID in Web Hosting
The SSD drives that our cutting-edge cloud Internet hosting platform employs for storage work in RAID-Z. This sort of RAID is developed to work with the ZFS file system that runs on the platform and it takes advantage of the so-called parity disk - a specific drive where data kept on the other drives is copied with an additional bit added to it. If one of the disks stops functioning, your websites shall continue working from the other ones and as soon as we replace the bad one, the data that will be cloned on it will be recovered from what is stored on the rest of the drives as well as the data from the parity disk. This is done so as to be able to recalculate the bits of each and every file adequately and to confirm the integrity of the info cloned on the new drive. This is one more level of security for the info you upload to your web hosting account in addition to the ZFS file system which compares a special digital fingerprint for each file on all the disk drives in real time.
RAID in Semi-dedicated Hosting
The SSD drives that are used for saving any website content uploaded to the semi-dedicated hosting accounts that we provide function in RAID-Z. This is a special 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 this type of a drive. If a disk fails and is replaced with a new one, what info will be cloned on the latter will be a combination calculated between the data on the other drives and that on the parity one. This is done to ensure that the info on the new drive will be accurate. Throughout the procedure, the RAID will continue operating adequately and the problematic drive will not affect the proper operation of your sites by any means. Working with SSDs in RAID-Z is a great addition to the ZFS file system which runs on our top-notch cloud platform with regards to preserving the integrity of your files since ZFS uses unique digital identifiers known as checksums in order to prevent silent data corruption.