RAID, which stands short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which allows a system to employ a number of hard drives as a single logical unit. Put simply, all of the drives are used as one and the data on all of them is identical. This type of a setup has two key advantages over using a single drive to keep data - the first one is redundancy, so in the event that one drive fails, the data will be accessible from the remaining ones, and the second one is better performance because the input/output, or reading/writing operations will be distributed among multiple drives. There're different RAID types depending on how many drives are employed, whether reading and writing are both handled from all drives simultaneously, whether data is written in blocks on one drive after another or is mirrored between drives in the same time, etcetera. Depending on the exact setup, the fault tolerance and the performance vary.
RAID in Cloud Web Hosting
All content that you upload to your new cloud web hosting account will be stored on quick SSD drives which operate in RAID-Z. This configuration is built to use the ZFS file system which runs on our cloud web hosting platform and it adds one more level of security for your site content on top of the real-time checksum verification which ZFS uses to guarantee the integrity of the data. With RAID-Z, the info is stored on a couple of disks and at least one is a parity disk - whenever info is recorded on it, an additional bit is added, so in case any drive stops working for some reason, the integrity of the data can be verified by recalculating its bits based on what is stored on the production hard drives and on the parity one. With RAID-Z, the operation of our system will not be interrupted and it will continue functioning smoothly until the malfunctioning drive is replaced and the information is synchronized on it.
RAID in Semi-dedicated Hosting
The SSD drives that are used for storing any website content uploaded to the semi-dedicated hosting accounts that we provide operate in RAID-Z. This is a specific configuration where one or more drives are employed for parity i.e. the system will include an extra bit to any data duplicated on such a drive. In case that a disk fails and is substituted with another one, what data will be copied on the latter shall be a mix calculated between the data on the remaining disks and that on the parity one. This is done to make sure that the information on the new drive shall be accurate. During the procedure, the RAID will continue functioning normally and the faulty drive will not have an effect on the proper operation of your sites at all. Using SSDs in RAID-Z is an outstanding addition to the ZFS file system that runs on our cutting-edge cloud platform with regards to preserving the integrity of your files as ZFS uses unique digital identifiers referred to as checksums in order to prevent silent data corruption.
RAID in VPS Hosting
The SSD drives that we use on the machines where we generate virtual private servers operate in RAID to make sure that any content which you upload will be available and intact all the time. At least a single drive is used for parity - one bit of info is added to any data copied on it. In case a main drive stops working, it is replaced and the data that will be copied on it is calculated between the remaining drives and the parity one. It's done this way to ensure that the required information is copied and that not a single file is corrupted as the new drive will be included in the RAID afterwards. Also, we use hard disks operating in RAID on the backup servers, so in the event that you add this upgrade to your VPS package, you shall use an even more reliable Internet hosting service since your content will be available on multiple drives irrespective of any sort of unpredicted hardware malfunction.