RAID, which is short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which makes it possible for a system to take advantage of multiple hard drives as a single logical unit. To put it differently, all drives are used as one and the data on all of them is the same. Such a setup has two key advantages over using a single drive to keep data - the first one is redundancy, so in the event that one drive stops working, the data will be accessed through the others, and the second is better performance as the input/output, or reading/writing operations will be distributed among several drives. There are different RAID types based on the number of drives are used, if reading and writing are both handled from all the drives concurrently, if data is written in blocks on one drive after another or is mirrored between drives in the same time, etcetera. According to the particular setup, the fault tolerance and the performance may vary.

RAID in Shared Hosting

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

RAID in Semi-dedicated Hosting

The RAID type that we employ for the cloud hosting platform where your semi-dedicated hosting account will be created is referred to as 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 kind of data is copied on this special hard drive, one more bit is added to it and in case a malfunctioning disk is changed, the data that will be cloned on it is a mix of the data on the remaining hard drives in the RAID and that on the parity one. It's done this way to guarantee that the information is intact. During this process, your Internet sites will be up and running normally because RAID-Z enables a whole 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 which uses checksums to guarantee that no data shall get silently corrupted on our servers, you will never have to worry about the integrity of your files.

RAID in VPS

The SSD drives which we use on the machines where we create virtual private servers function in RAID to make sure that any content that you upload will be available and intact all of the time. At least one drive is employed for parity - one bit of information is added to any data copied on it. In the event that a main drive stops working, it is changed and the data that will be copied on it is calculated between the remaining drives and the parity one. That’s done to make sure that the correct data is copied and that no file is corrupted since the new drive will be incorporated into the RAID afterwards. We also use hard disks working in RAID on the backup servers, so in the event that you add this upgrade to your VPS package, you'll use an even more reliable web hosting service since your content will be available on multiple drives regardless of any type of unforeseen hardware malfunction.