RAID, or Redundant Array of Independent Disks, is a technology of keeping data on multiple hard drives which operate together as one single logical unit. The drives could be physical or logical i.e. in the aforementioned case one single drive is divided into different ones through virtualization software. In either case, the same information is kept on all the drives and the key benefit of using such a setup is that if a drive stops working, the data will still be available on the remaining ones. Having a RAID also enhances the performance because the input and output operations will be spread among a couple of drives. There are several types of RAID dependant upon how many hard disks are used, whether writing is carried out on all of the drives in real time or just on one, and how the information is synced between the drives - whether it is recorded in blocks on one drive after another or it is mirrored from one on the others. All these factors suggest that the fault tolerance and the performance between the various RAID types could differ.
RAID in Web Hosting
Our state-of-the-art cloud hosting platform where all web hosting accounts are created employs super fast SSD drives rather than the traditional HDDs, and they function in RAID-Z. With this configuration, a number of hard drives work together and at least a single one is a dedicated parity disk. Simply put, when data is written on the other drives, it is copied on the parity one adding an extra bit. This is carried out for redundancy as even if some drive fails or falls out of the RAID for whatever reason, the info can be rebuilt and verified thanks to the parity disk and the data recorded on the other ones, which means that not a thing will be lost and there will not be any service interruptions. This is one more level of security for your information together with the top-notch ZFS file system which uses checksums to guarantee that all the data on our servers is intact and is not silently corrupted.
RAID in Semi-dedicated Hosting
The RAID type which we use for the cloud Internet hosting platform where your semi-dedicated hosting account shall be created is named RAID-Z. What's different about it is that at least 1 of the disks is employed as a parity drive. Put simply, whenever any kind of data is cloned on this special hard drive, one more bit is included to it and if a problematic disk is replaced, the info that will be duplicated on it is a combination of the data on the remaining hard drives in the RAID and that on the parity one. It's done this way to make sure that the information is intact. During this process, your websites will be up and running normally because RAID-Z enables a whole drive to fail without service disturbances and it simply works by using one of the other ones as the main production drive. Employing RAID-Z together with the ZFS file system which uses checksums to ensure that no data will get silently corrupted on our servers, you will never have to worry about the integrity of your files.
RAID in VPS Web Hosting
The SSD drives which we use on the machines where we create virtual private servers function in RAID to make sure that any content you upload will be available and intact at all times. At least 1 drive is used for parity - one bit of data is added to any data cloned on it. In the event that a main drive fails, it is changed and the information which will be cloned on it is calculated between the remaining drives and the parity one. It's done this way to make sure that the right information is copied and that not a single file is corrupted as the new drive will be incorporated into the RAID afterwards. Also, we use hard drives operating in RAID on the backup servers, so if you add this upgrade to your VPS package, you'll use an even more reliable web hosting service since your content will be available on multiple drives irrespective of any kind of sudden hardware malfunction.