RAID, which is short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that allows a system to take advantage of multiple hard drives as one single logical unit. In other words, all of the drives are used as one and the data on all of them is the same. This type of a configuration has two key advantages over using just a single drive to save data - the first is redundancy, so in the event that one drive stops working, the data will be accessible through the remaining ones, and the second one is better performance as the input/output, or reading/writing operations will be spread among a number of drives. You can find different RAID types depending on what amount of drives are used, if reading and writing are both executed from all drives concurrently, if 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 could differ.

RAID in Shared Hosting

The SSD drives which our cutting-edge cloud Internet hosting platform employs for storage operate in RAID-Z. This kind of RAID is intended to work with the ZFS file system that runs on the platform and it employs the so-called parity disk - a specific drive where information saved on the other drives is copied with an additional bit added to it. In the event that one of the disks fails, your Internet sites shall continue working from the other ones and after we replace the problematic one, the data which will be duplicated on it will be rebuilt from what is stored on the other drives as well as the data from the parity disk. This is performed so as to be able to recalculate the elements of every single file correctly and to validate the integrity of the information duplicated on the new drive. This is one more level of security for the information you upload to your shared hosting account in addition to the ZFS file system which compares a special digital fingerprint for each file on all the drives in real time.

RAID in Semi-dedicated Hosting

In case you host your websites within a semi-dedicated hosting account from our company, all the content which you upload will be kept on SSD drives which operate in RAID-Z. With this form of RAID, at least 1 of the hard drives is used for parity - when data is synced between the disks, an additional bit is included in it on the parity one. The idea behind this is to guarantee the integrity of the data that is copied to a brand new drive in the event that one of the drives in the RAID stops functioning since the site content being copied on the new disk is recalculated from the data on the standard drives and on the parity one. An additional advantage of RAID-Z is that even in case a drive stops working, the system can easily switch to a different one right away without service disturbances of any sort. RAID-Z adds one more level of safety for the content that you upload on our cloud Internet hosting platform along with the ZFS file system that uses unique checksums so as to verify the integrity of every single file.