Redundant Array of Independent Disks, or RAID, is a method of storing content on a number of hard disks concurrently. A RAID can be software or hardware depending on the drives that are used - physical or logical ones, but what is common between them is that they all function as just a single unit where data is saved. The key advantage of using a RAID is redundancy as the info on all drives is the same at all times, so even in the event that some drive fails for whatever reason, the info will still be present on the remaining drives. The general performance is also enhanced since 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 capabilities and fault tolerance may vary depending on the particular setup - whether info is written on all of the drives in real time or it's written on one drive and afterwards mirrored on another, the number of drives are used for the RAID, and many others.
RAID in Cloud Web Hosting
The SSD drives that our cutting-edge cloud web hosting platform employs for storage operate in RAID-Z. This type of RAID is intended 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 info stored on the other drives is duplicated with an additional bit added to it. In the event that one of the disks stops working, your sites will continue working from the other ones and as soon as we replace the malfunctioning one, the info that will be duplicated on it will be rebuilt from what is stored on the other 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 correctly and to authenticate the integrity of the information copied on the new drive. This is another level of security for the content that you upload to your cloud web hosting account in addition to the ZFS file system which analyzes a special digital fingerprint for each and every file on all the disk drives in real time.
RAID in Semi-dedicated Hosting
The SSD drives that are used for keeping any website content uploaded to the semi-dedicated hosting accounts which 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 kind of a hard drive. If a disk fails and is substituted with another one, what data will be duplicated on the latter will be a combination calculated between the data on the other hard disks and that on the parity one. This is done to ensure that the information on the new drive will be correct. During the process, the RAID will continue working normally and the problematic drive won't impact the adequate operation of your websites at all. Working with SSDs in RAID-Z is an outstanding addition to the ZFS file system that runs on our revolutionary cloud platform with regard to preserving the integrity of your files since ZFS uses specific digital identifiers called checksums in order to avoid silent data corruption.
RAID in VPS Web Hosting
If you take advantage of one of our virtual private server plans, any content which you upload will be kept on SSD drives that operate in RAID. At least 1 drive is intended for parity to guarantee the integrity of the information. In simple terms, this is a special drive where data is copied with one bit added to it. If a disk from the RAID stops functioning, your sites will continue working and when a new disk takes the place of the defective one, the bits of the info that will be copied on it are calculated using the healthy and the parity drives. This way, any probability of corrupting data throughout the process is avoided. We also use regular hard disks which function in RAID for storing backups, so should you include this service to your VPS package, your website content will be kept on multiple drives and you will never need to worry about its integrity even in the event of multiple drive failures.