RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that permits a system to employ a number of hard drives as one single logical unit. Put simply, all drives are used as one and the info on all of them is the same. This type of a configuration has 2 key advantages over using a single drive to keep data - the first one is redundancy, so in case one drive doesn't work, the information will be accessed through the remaining ones, and the second one is improved performance since the input/output, or reading/writing operations will be distributed among multiple drives. There're different RAID types in accordance with what number of drives are used, if reading and writing are both performed from all of the drives simultaneously, whether data is written in blocks on one drive after another or is mirrored between drives in the same time, etcetera. Based on the particular setup, the fault tolerance and the performance could differ.

RAID in Shared Web Hosting

The SSD drives that our cutting-edge cloud web hosting platform employs for storage work in RAID-Z. This kind of RAID is created to work with the ZFS file system that runs on the platform and it works by using the so-called parity disk - a specific drive where data stored on the other drives is duplicated with an extra bit added to it. In case one of the disks fails, your sites shall continue working from the other ones and as soon as we replace the faulty one, the data which will be duplicated on it will be rebuilt from what is stored on the rest of the drives together with the information from the parity disk. This is performed in order to be able to recalculate the elements of every file correctly and to validate the integrity of the data copied on the new drive. This is another level of security for the information that you upload to your shared web hosting account along with the ZFS file system which analyzes a unique digital fingerprint for each file on all drives in real time.

RAID in Semi-dedicated Servers

The RAID type that we employ for the cloud web hosting platform where your semi-dedicated server account will be created is named RAID-Z. What's different about it is that at least one of the disks is used as a parity drive. Put simply, whenever any kind of data is cloned on this specific disk drive, one more bit is added to it and in the event that a faulty disk is replaced, the information that will be copied on it is a mix of the data on the other drives in the RAID and that on the parity one. It's done this way to guarantee that your info is intact. During this process, your websites will be working normally because RAID-Z makes it possible for a whole drive to fail without service interruptions and it simply works by using one of the remaining ones as the main production drive. Employing RAID-Z together with the ZFS file system which uses checksums to guarantee that no data will get silently corrupted on our servers, you will not need to worry about the integrity of your files.

RAID in VPS Servers

The SSD drives that we use on the physical machines where we set up VPS servers operate in RAID to ensure that any content that you upload will be available and intact all the time. At least 1 drive is employed for parity - one bit of data is added to any data copied on it. In the event that a main drive breaks down, it is changed and the info that will be cloned on it is calculated between the rest of the drives and the parity one. That’s done to make sure that the needed data is copied and that no file is corrupted as the new drive will be used in the RAID afterwards. We also use hard disks functioning in RAID on the backup servers, so in the event that you add this upgrade to your VPS plan, you'll use an even more reliable web hosting service because your content will be available on multiple drives irrespective of any sort of sudden hardware failure.