RAID, which is short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which enables a system to take advantage of a number of hard drives as one single logical unit. Simply put, all drives are used as one and the information on all of them is identical. This kind of a configuration has 2 key advantages over using just a single drive to save data - the first one is redundancy, so in case one drive breaks down, the information will be accessible from the remaining ones, and the second is better performance because the input/output, or reading/writing operations will be distributed among multiple drives. There're different RAID types based on what number of drives are employed, if reading and writing are both done from all the 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 particular setup, the error tolerance and the performance could differ.

RAID in Web Hosting

The SSD drives which our cutting-edge cloud hosting platform uses for storage operate in RAID-Z. This sort of RAID is intended to work with the ZFS file system that runs on the platform and it employs the so-called parity disk - a specific drive where data located on the other drives is duplicated with an additional bit added to it. In the event that one of the disks stops working, your websites will continue working from the other ones and as soon as we replace the faulty one, the data which will be duplicated on it will be recovered from what is stored on the remaining drives along with the data from the parity disk. This is performed so as to be able to recalculate the elements of each file adequately and to authenticate the integrity of the information duplicated on the new drive. This is another level of security for the info that you upload to your web hosting account in addition to the ZFS file system that analyzes a unique digital fingerprint for every single file on all hard drives in real time.

RAID in Semi-dedicated Servers

The info uploaded to any semi-dedicated server account is stored on SSD drives which work in RAID-Z. One of the drives in type of a setup is used for parity - any time data is copied on it, an additional bit is added. In case a disk turns out to be faulty, it will be removed from the RAID without disturbing the work of the Internet sites because the data will load from the rest of the drives, and when a new drive is added, the info that will be cloned on it will be a blend between the data on the parity disk and data kept on the other hard drives in the RAID. That is done to ensure that the information that is being cloned is accurate, so as soon as the new drive is rebuilt, it could be integrated into the RAID as a production one. This is an extra guarantee for the integrity of your information because the ZFS file system that runs on our cloud Internet hosting platform compares a unique checksum of all of the copies of your files on the various drives so as to avoid any possibility of silent data corruption.

RAID in VPS Servers

The physical servers where we generate VPS server use quick SSD drives that will raise the speed of your Internet sites noticeably. The drives function in RAID to guarantee that you won't lose any info as a result of a power loss or a hardware failure. The production servers take advantage of a variety of drives where the data is kept and one disk is used for parity i.e. one bit is added to all data copied on it, which makes it easier to recover the content without any loss in the event a main drive fails. If you pick our backup service, the data will be stored on a separate machine which uses standard hard-disk drives and although there is no parity one in this case, they are also in a RAID to ensure that we will have a backup of your content all of the time. With this kind of setup your info will always be safe because it will be available on several disk drives.