RAID, or Redundant Array of Independent Disks, is a technology of keeping data on a number hard drives which function together as one single logical unit. The drives could be physical or logical i.e. in the aforementioned case one drive is divided into different ones using virtualization software. In either case, identical info is kept on all the drives and the main benefit of using this type of a setup is that if a drive stops working, the data will still be available on the other ones. Using a RAID also boosts the performance because the input and output operations will be spread among a number of drives. There are several kinds of RAID dependant upon how many hard drives are used, whether writing is done on all of the drives in real time or just on one, and how the data is synchronized between the hard drives - whether it's written in blocks on one drive after another or it is mirrored from one on the others. All of these factors imply that the error tolerance and the performance between the different RAID types may differ.
RAID in Web Hosting
The SSD drives that our cutting-edge cloud web hosting platform employs for storage function in RAID-Z. This type of RAID is designed to work with the ZFS file system that runs on the platform and it employs the so-called parity disk - a special drive where data saved on the other drives is cloned with an extra bit added to it. In the event that one of the disks stops functioning, your websites will continue working from the other ones and once we replace the malfunctioning one, the information which will be cloned on it will be recovered from what is stored on the remaining drives together with the info from the parity disk. This is performed in order to be able to recalculate the elements of every single file correctly and to verify the integrity of the information cloned on the new drive. This is another level of security for the information which you upload to your web hosting account in addition to the ZFS file system that analyzes a special digital fingerprint for every single file on all disk drives in real time.
RAID in Semi-dedicated Servers
The SSD drives that are used for keeping any website content uploaded to the semi-dedicated server accounts which we provide work 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 duplicated on such a disk drive. In the event that a disk fails and is replaced with another one, what info will be copied 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 shall be accurate. Throughout the process, the RAID will continue operating normally and the malfunctioning drive won't have an effect on the normal operation of your websites in any respect. Working with SSDs in RAID-Z is an impressive addition to the ZFS file system that runs on our top-notch cloud platform in terms of preserving the integrity of your files since ZFS uses unique digital identifiers called checksums so as to prevent silent data corruption.
RAID in VPS Servers
The SSD drives that we use on the machines where we set up VPS servers function in RAID to ensure that any content that you upload will be available and intact all of the time. At least one drive is employed for parity - one bit of information is added to any data copied on it. In the event that a main drive stops working, it is replaced and the data which will be copied on it is calculated between the remaining drives and the parity one. It's done this way to ensure that the right info is copied and that no file is corrupted since the new drive will be incorporated into the RAID afterwards. We also use hard disk drives working in RAID on the backup servers, so in the event that you add this upgrade to your VPS package, you will use an even more reliable web hosting service because your content will be available on multiple drives irrespective of any sudden hardware malfunction.