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 a single logical unit. Put simply, all of the drives are used as one and the info on all of them is identical. Such a configuration has 2 key advantages over using a single drive to keep data - the first is redundancy, so in case one drive stops working, the info will be accessible through the remaining ones, and the second is better performance because the input/output, or reading/writing operations will be spread among different 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 simultaneously, if data is written in blocks on one drive after another or is mirrored between drives in the same time, and so on. According to the particular setup, the fault tolerance and the performance vary.

RAID in Web Hosting

Our state-of-the-art cloud Internet hosting platform where all web hosting accounts are created uses quick SSD drives as opposed to the traditional HDDs, and they function in RAID-Z. With this configuration, a number of hard disks function together and at least one is a dedicated parity disk. In simple terms, when data is written on the other drives, it is duplicated on the parity one adding an extra bit. This is performed for redundancy as even in case some drive fails or falls out of the RAID for some reason, the info can be rebuilt and verified using the parity disk and the data saved on the other ones, so practically nothing will be lost and there won't be any service interruptions. This is an additional level of security for your info together with the state-of-the-art ZFS file system which uses checksums to make sure that all of the data on our servers is intact and is not silently corrupted.

RAID in Semi-dedicated Servers

The data uploaded to any semi-dedicated server account is stored on SSD drives that operate in RAID-Z. One of the drives in this kind of a setup is used for parity - whenever data is cloned on it, an extra bit is added. If a disk turns out to be flawed, it will be removed from the RAID without interrupting the functioning of the sites as the data will load from the other drives, and when a new drive is included, the data which will be duplicated on it will be a mix between the information on the parity disk and data stored on the other hard drives in the RAID. This is done in order to guarantee that the information which is being cloned is correct, so once the new drive is rebuilt, it can be included in the RAID as a production one. This is an extra guarantee for the integrity of your info because the ZFS file system that runs on our cloud web hosting platform analyzes a unique checksum of all of the copies of the files on the different drives to be able to avoid any possibility of silent data corruption.

RAID in VPS Servers

If you employ one of our VPS server packages, any content that you upload will be saved on SSD drives which work in RAID. At least a single drive is employed for parity so as to ensure the integrity of your info. In simple terms, this is a special drive where data is copied with one bit added to it. In case a disk from the RAID stops functioning, your websites will continue working and when a new disk replaces the defective one, the bits of the data that will be copied on it are calculated by using the healthy and the parity drives. That way, any possibility of corrupting data during the process is averted. We also use regular hard disks which work in RAID for storing backup copies, so in case you add this service to your VPS plan, your site content will be kept on multiple drives and you won't ever need to worry about its integrity even in the event of multiple drive breakdowns.