RAID, or Redundant Array of Independent Disks, is a technology of storing data on a number hard disks that work together as one logical unit. The drives can be physical or logical i.e. in the aforementioned case one single drive is divided into different ones through virtualization software. In either case, identical data is saved on all the drives and the basic benefit of employing this kind of a setup is that if a drive stops working, the data will remain available on the other ones. Using a RAID also improves the overall performance because the input and output operations will be spread among several drives. There are several types of RAID dependant upon how many hard drives are used, whether writing is performed on all the drives in real time or just on one, and how the information is synchronized between the hard drives - whether it is recorded in blocks on one drive after another or all of it is mirrored from one on the others. These factors mean that the fault tolerance as well as the performance between the different RAID types may differ.
RAID in Website Hosting
The revolutionary cloud web hosting platform where all website hosting accounts are created uses fast SSD drives as opposed to the classic HDDs, and they function in RAID-Z. With this configuration, multiple hard disk drives operate together and at least one of them is a dedicated parity disk. In simple terms, when data is written on the remaining drives, it is cloned on the parity one adding an extra bit. This is performed for redundancy as even if a drive fails or falls out of the RAID for whatever reason, the info can be rebuilt and verified using the parity disk and the data recorded on the other ones, therefore nothing will be lost and there won't be any service interruptions. This is another level of security for your information in addition to the state-of-the-art ZFS file system which uses checksums to ensure that all of the data on our servers is undamaged and is not silently corrupted.
RAID in Semi-dedicated Hosting
In case you host your websites within a semi-dedicated hosting account from our firm, all the content you upload will be kept on SSD drives which operate in RAID-Z. With this kind of RAID, at least 1 of the hard disks is used for parity - when data is synchronized between the hard drives, an additional bit is added to it on the parity one. The reasoning behind this is to guarantee the integrity of the info which is duplicated to a new drive in case one of the drives in the RAID stops functioning as the site content being copied on the brand new disk is recalculated from the data on the standard hard drives and on the parity one. An additional advantage of RAID-Z is the fact that even in case a drive fails, the system can switch to another one promptly without service disruptions of any kind. RAID-Z adds an extra level of protection for the content that you upload on our cloud web hosting platform along with the ZFS file system which uses unique checksums as a way to verify the integrity of each file.
RAID in VPS Web Hosting
If you use one of our virtual private server solutions, any content which you upload will be stored on SSD drives which function in RAID. At least a single drive is intended for parity so as to ensure the integrity of the info. In simple terms, this is a special drive where data is copied with one bit added to it. In the event that a disk within the RAID breaks down, your Internet sites will continue working and when a new disk substitutes the faulty one, the bits of the data that will be duplicated on it are calculated by using the healthy and the parity drives. By doing this, any potential for corrupting data during the process is avoided. We also employ ordinary hard disk drives that function in RAID for storing backups, so in case you include this service to your VPS package, your site content will be kept on multiple drives and you will never have to worry about its integrity even in the event of multiple drive breakdowns.