RAID, which stands short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which enables a system to use multiple hard drives as a single logical unit. Put simply, all the drives are used as one and the info on all of them is the same. Such a setup has 2 key advantages over using just a single drive to store data - the first is redundancy, so in the event that one drive fails, the information will be accessible from the others, and the second one is better performance because the input/output, or reading/writing operations will be distributed among several drives. You can find different RAID types depending on what amount of drives are used, whether reading and writing are both executed 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. According to the exact setup, the error tolerance and the performance could differ.
RAID in Shared Website Hosting
All the content that you upload to your new shared website hosting account will be stored on fast SSD drives which work in RAID-Z. This setup is built to employ the ZFS file system which runs on our cloud web hosting platform and it adds another level of security for your site content in addition to the real-time checksum validation which ZFS uses to guarantee the integrity of the data. With RAID-Z, the data is saved on a couple of disks and at least one is a parity disk - whenever information is written on it, an extra bit is added, so in the event that any drive stops functioning for whatever reason, the stability of the data can be verified by recalculating its bits based on what is kept on the production drives and on the parity one. With RAID-Z, the functioning of our system won't be interrupted and it will continue working efficiently until the faulty drive is replaced and the data is synced on it.
RAID in Semi-dedicated Hosting
The SSD drives which are used for keeping any site content uploaded to the semi-dedicated hosting accounts which we offer function in RAID-Z. This is a special setup where one or more drives are used for parity i.e. the system will add an extra bit to any data cloned on such a disk drive. If a disk fails and is substituted with another one, what information will be duplicated on the latter will be a combination calculated between the data on the remaining hard disks and that on the parity one. This is done to guarantee that the data on the new drive will be accurate. During the process, the RAID will continue functioning adequately and the malfunctioning drive won't impact the proper operation of your sites in any respect. Using SSDs in RAID-Z is an outstanding addition to the ZFS file system which runs on our revolutionary cloud platform with regards to preserving the integrity of your files as ZFS uses unique digital identifiers known as checksums in order to avoid silent data corruption.
RAID in VPS Hosting
The SSD drives that we use on the machines where we generate virtual private servers function in RAID to make sure that any content which 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 copied on it. In the event that a main drive breaks down, it is changed and the data that will be copied on it is calculated between the rest of the drives and the parity one. This is done to ensure that the needed info is copied and that no file is corrupted since the new drive will be a part of the RAID afterwards. In addition, we use hard disks working in RAID on the backup servers, so in the event that you add this upgrade to your VPS package, you'll use an even more reliable hosting service since your content will be available on multiple drives irrespective of any kind of unpredicted hardware malfunction.