RAID, which stands short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which allows a system to employ several hard drives as a single logical unit. Put simply, all drives are used as one and the information on all of them is the same. This type of a setup has two key advantages over using a single drive to keep data - the first is redundancy, so if one drive breaks down, the information will be accessed through the others, and the second one is improved performance as the input/output, or reading/writing operations will be distributed among several drives. There're different RAID types in accordance with what amount of drives are used, whether reading and writing are both handled from all of the drives at the same time, whether 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 exact setup, the fault tolerance and the performance could differ.
RAID in Cloud Web Hosting
Our advanced cloud web hosting platform where all cloud web hosting accounts are created uses fast SSD drives rather than the traditional HDDs, and they work in RAID-Z. With this configuration, several hard drives function together and at least 1 is a dedicated parity disk. Basically, when data is written on the remaining drives, it's cloned on the parity one adding an extra bit. This is done for redundancy as even if some drive fails or falls out of the RAID for whatever reason, the info can be rebuilt and verified thanks to the parity disk and the data stored on the other ones, so not a thing will be lost and there will be no service disturbances. This is an additional level of security for your data together with the cutting-edge ZFS file system that uses checksums to ensure that all 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 which function in RAID-Z. One of the drives in such a setup is used for parity - whenever data is cloned on it, an extra bit is added. In case a disk turns out to be problematic, it will be taken out of the RAID without disturbing the operation of the Internet sites since the data will load from the remaining drives, and when a brand new drive is added, the info that will be duplicated on it will be a mix between the data on the parity disk and data saved on the other hard disks in the RAID. This is done in order to guarantee that the info which is being duplicated is accurate, so as soon as the new drive is rebuilt, it could be incorporated into the RAID as a production one. This is one more guarantee for the integrity of your info since the ZFS file system which runs on our cloud Internet hosting platform compares a unique checksum of all copies of the files on the various drives to avoid any possibility of silent data corruption.
RAID in VPS Servers
If you take advantage of one of our VPS server solutions, any content that you upload will be stored on SSD drives that function in RAID. At least 1 drive is intended for parity to guarantee the integrity of the info. In simple terms, this is a special drive where info is copied with one bit added to it. In case a disk within the RAID fails, your sites will continue working and when a new disk takes the place of the flawed one, the bits of the data that will be copied on it are calculated using the healthy and the parity drives. This way, any chance of corrupting data during the process is prevented. We also employ conventional hard drives which function in RAID for storing backups, so if you add this service to your VPS plan, your content will be saved on multiple drives and you won't ever need to worry about its integrity even in the event of multiple drive failures.