RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which permits a system to use a number of hard drives as a single logical unit. Simply put, all drives are used as one and the information on all of them is the same. This kind of a configuration has two key advantages over using just a single drive to save data - the first one is redundancy, so if one drive stops working, the info will be accessed through the others, and the second one is better performance since the input/output, or reading/writing operations will be spread among multiple drives. There are different RAID types depending on how many drives are used, whether reading and writing are both executed from all of the drives at the same time, if 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 particular setup, the error tolerance and the performance may vary.

RAID in Shared Web Hosting

The SSD drives that our cutting-edge cloud Internet hosting platform uses for storage work in RAID-Z. This type of RAID is created to work with the ZFS file system which runs on the platform and it employs the so-called parity disk - a special drive where data kept on the other drives is duplicated with an additional bit added to it. If one of the disks stops working, your sites will continue working from the other ones and after we replace the bad one, the data that will be duplicated on it will be recovered from what is stored on the other drives together with the information from the parity disk. This is performed so as to be able to recalculate the elements of each and every file correctly and to confirm the integrity of the info cloned on the new drive. This is one more level of security for the content that you upload to your shared web hosting account along with the ZFS file system that compares a unique digital fingerprint for each file on all the drives in real time.

RAID in Semi-dedicated Hosting

The RAID type which we use for the cloud Internet hosting platform where your semi-dedicated hosting account will be created is known as RAID-Z. What's different about it is that at least 1 of the disks is used as a parity drive. Put simply, whenever any data is duplicated on this special disk drive, one more bit is added to it and in case a defective disk is replaced, the information that will be copied on it is a combination of the data on the remaining hard drives in the RAID and that on the parity one. This is done to guarantee that the info is intact. Throughout this process, your Internet sites will be functioning normally as RAID-Z makes it possible for an entire drive to fail without causing any service disruptions and it simply works by using one of the other ones as the main production drive. Using RAID-Z together with the ZFS file system that uses checksums to warrant that no data can get silently corrupted on our servers, you won't ever have to worry about the integrity of your files.