RAID, which is short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which permits a system to take advantage of a number of hard drives as a single logical unit. Simply put, all the drives are used as one and the info on all of them is identical. This kind of a setup has two key advantages over using just a single drive to keep data - the first one is redundancy, so in case one drive stops working, the info will be accessed from the remaining ones, and the second one is improved performance since the input/output, or reading/writing operations will be spread among multiple drives. There are different RAID types in accordance with how many drives are employed, if reading and writing are both done from all of the drives concurrently, if data is written in blocks on one drive after another or is mirrored between drives in the same time, and many others. Depending on the particular setup, the fault tolerance and the performance may differ.

RAID in Cloud Hosting

The advanced cloud Internet hosting platform where all cloud hosting accounts are created uses quick SSD drives as opposed to the standard HDDs, and they work in RAID-Z. With this configuration, multiple hard drives operate together and at least one of them is a dedicated parity disk. Put simply, when data is written on the remaining drives, it is 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 saved on the other ones, so practically nothing will be lost and there will not be any service interruptions. This is one more level of protection for your info in addition to the state-of-the-art ZFS file system which uses checksums to ensure that all data on our servers is intact and is not silently corrupted.

RAID in Semi-dedicated Hosting

The RAID type which we employ for the cloud web hosting platform where your semi-dedicated hosting account will be created is known as RAID-Z. What is different about it is that at least 1 of the disks is employed as a parity drive. In simple terms, whenever any kind of data is duplicated on this particular drive, one more bit is added to it and in the event that a defective disk is changed, the info which will be duplicated 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 make sure that your information is intact. Throughout this process, your sites will be up and running normally as RAID-Z enables an entire drive to fail without any service disruptions and it simply uses one of the remaining ones as the main production drive. Employing RAID-Z together with the ZFS file system that uses checksums to ensure that no data will 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 work in RAID to ensure that any content which you upload will be available and intact all the time. At least a single drive is used for parity - one bit of data is added to any data copied on it. If a main drive fails, it is replaced and the info which will be cloned on it is calculated between the remaining drives and the parity one. It's done this way to ensure that the needed info is copied and that not a single 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 case you add this upgrade to your VPS package, you'll use an even more reliable hosting service as your content will be available on multiple drives regardless of any type of sudden hardware malfunction.