RAID, which stands short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that enables a system to use several hard drives as one single logical unit. Put simply, all drives are used as one and the info on all of them is the same. This type of a setup has 2 key advantages over using just a single drive to store data - the first one is redundancy, so in the event that one drive breaks down, the information will be accessible from the others, and the second is better performance since the input/output, or reading/writing operations will be spread among multiple drives. There are different RAID types in accordance with how many drives are employed, if reading and writing are both executed from all of the drives simultaneously, whether data is written in blocks on one drive after another or is mirrored between drives in the same time, etcetera. Based on the exact setup, the fault tolerance and the performance may vary.
RAID in Hosting
The revolutionary cloud Internet hosting platform where all hosting accounts are created uses super fast SSD drives as an alternative to the standard HDDs, and they operate in RAID-Z. With this configuration, multiple hard drives work together and at least one of them is a dedicated parity disk. Simply put, when data is written on the other drives, it's copied 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 some reason, the info can be rebuilt and verified thanks to the parity disk and the data saved on the other ones, therefore practically nothing will be lost and there will not be any service disorders. This is another level of security for your data together with the state-of-the-art ZFS file system that uses checksums to make sure that all 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 saved on SSD drives which work in RAID-Z. One of the drives in type of a configuration is used for parity - every time data is cloned on it, an extra bit is added. If a disk turns out to be problematic, it will be taken out of the RAID without interrupting the work of the sites since the data will load from the rest of the drives, and when a brand new drive is added, the info that will be copied on it will be a mix between the info on the parity disk and data kept on the other hard drives in the RAID. That is done to ensure that the data that is being duplicated is accurate, so the moment the new drive is rebuilt, it could be included in the RAID as a production one. This is an extra warranty for the integrity of your info because the ZFS file system that runs on our cloud hosting platform analyzes a unique checksum of all the copies of your files on the separate drives in order to avoid any possibility of silent data corruption.
RAID in VPS Servers
If you employ one of our VPS server solutions, any content that you upload will be saved on SSD drives that operate in RAID. At least one drive is intended for parity to ensure the integrity of the information. In simple terms, this is a special drive where data is copied with one bit added to it. In the event that a disk in the RAID stops working, your websites will continue working and when a new disk replaces the defective one, the bits of the data that will be cloned on it are calculated by using the healthy and the parity drives. This way, any probability of corrupting data during the process is avoided. We also employ ordinary hard disks which work in RAID for storing backups, so should you add this service to your VPS package, your site content will be kept on multiple drives and you won't ever have to worry about its integrity even in the event of multiple drive failures.