RAID, which is short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that allows a system to use many hard drives as one single logical unit. Put simply, all the drives are used as one and the information on all of them is the same. Such a setup has 2 key advantages over using just a single drive to keep data - the first is redundancy, so in the event that one drive doesn't work, the information will be accessible through the remaining ones, and the second one is improved performance as the input/output, or reading/writing operations will be distributed among a number of drives. There're different RAID types based on how many drives are used, whether 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, etc. Depending on the particular setup, the error tolerance and the performance may vary.

RAID in Cloud Web Hosting

The revolutionary cloud hosting platform where all cloud web hosting accounts are created employs fast SSD drives as opposed to the standard HDDs, and they work in RAID-Z. With this configuration, several hard drives operate together and at least a single one is a dedicated parity disk. Put simply, when data is written on the rest of the drives, it's duplicated on the parity one adding an extra bit. This is carried out for redundancy as even in case a drive fails or falls out of the RAID for whatever reason, the data can be rebuilt and verified thanks to the parity disk and the data stored on the other ones, thus absolutely nothing will be lost and there will be no service disturbances. This is an additional level of protection for your data in addition to the state-of-the-art ZFS file system that uses checksums to make sure that all data on our servers is undamaged and is not silently corrupted.

RAID in Semi-dedicated Servers

The RAID type that we use for the cloud hosting platform where your semi-dedicated server account shall be created is named RAID-Z. What's different about it is that at least 1 of the disks is used as a parity drive. In simple terms, whenever any data is duplicated on this particular hard drive, one more bit is included to it and if a defective disk is changed, the data that will be cloned on it is a combination of the data on the remaining disk drives in the RAID and that on the parity one. It's done this way to ensure that the data is intact. Throughout this process, your sites will be functioning normally since RAID-Z allows for a whole drive to fail without any service disturbances and it simply uses one of the remaining ones as the main production drive. Using RAID-Z together with the ZFS file system that uses checksums to warrant that no data will get silently corrupted on our servers, you won't need to worry about the integrity of your files.

RAID in VPS Servers

The SSD drives which we use on the physical machines where we create VPS servers work in RAID to ensure that any content that you upload will be available and intact all the time. At least 1 drive is used for parity - one bit of data is added to any data cloned on it. If a main drive breaks down, it is replaced and the data that will be cloned on it is calculated between the remaining drives and the parity one. This is done to ensure that the needed information is copied and that not a single file is corrupted because the new drive will be incorporated into the RAID afterwards. We also use hard drives operating in RAID on the backup servers, so in case you add this upgrade to your VPS package, you shall use an even more reliable web hosting service since your content will be available on multiple drives irrespective of any kind of unforeseen hardware failure.