RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which allows a system to use many hard drives as one single logical unit. Put simply, all the drives are used as one and the data on all of them is identical. Such a configuration has 2 huge advantages over using a single drive to keep data - the first one is redundancy, so if one drive breaks down, the info will be accessed through the remaining ones, and the second one is improved performance since the input/output, or reading/writing operations will be distributed among multiple drives. You can find different RAID types in accordance with what number 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. Depending on the exact setup, the fault tolerance and the performance may vary.

RAID in Shared Hosting

The SSD drives which our cutting-edge cloud hosting platform employs for storage operate in RAID-Z. This kind of RAID is intended to work with the ZFS file system which runs on the platform and it takes advantage of the so-called parity disk - a specific drive where info saved on the other drives is copied with an additional bit added to it. In the event that one of the disks fails, your Internet sites shall continue working from the other ones and after we replace the faulty one, the info which will be cloned on it will be recovered from what is stored on the rest of the drives as well as the information from the parity disk. This is performed in order to be able to recalculate the elements of each and every file properly and to verify the integrity of the data duplicated on the new drive. This is another level of security for the info which you upload to your shared hosting account in addition to the ZFS file system that compares a special digital fingerprint for each and every file on all of the drives in real time.

RAID in Semi-dedicated Servers

The SSD drives that are used for keeping any content uploaded to the semi-dedicated server accounts which we provide function in RAID-Z. This is a specific setup where one or more hard drives are used for parity i.e. the system will include an additional bit to any data copied on this type of a hard drive. If a disk fails and is replaced with another one, what info will be duplicated on the latter will be a mix calculated between the data on the remaining hard disks and that on the parity one. This is done to guarantee that the info on the new drive will be accurate. Throughout the process, the RAID will continue operating adequately and the malfunctioning drive will not have an effect on the adequate operation of your websites by any means. Working with SSDs in RAID-Z is an impressive 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 special digital identifiers named checksums to prevent silent data corruption.

RAID in VPS Servers

The SSD drives which we use on the machines where we generate VPS servers function in RAID to ensure that any content which you upload will be available and intact all of the time. At least one drive is used for parity - one bit of data is added to any data copied on it. If a main drive fails, it is changed and the info which will be copied on it is calculated between the other drives and the parity one. This is done to make sure that the right information is copied and that not a single file is corrupted as the new drive will be used in the RAID afterwards. In addition, we use hard disks functioning in RAID on the backup servers, so in the event that you add this upgrade to your VPS plan, you shall use an even more reliable hosting service since your content will be available on multiple drives irrespective of any kind of unpredicted hardware failure.