RAID, or Redundant Array of Independent Disks, is a technology of saving data on multiple hard disks that work together as one logical unit. The drives can be physical or logical i.e. in the aforementioned case a single drive is divided into independent ones via virtualization software. In either case, exactly the same data is stored on all the drives and the basic benefit of using this type of a setup is that in case a drive breaks down, the data will still be available on the other ones. Having a RAID also improves the overall performance as the input and output operations will be spread among a number of drives. There are several kinds of RAID dependant upon how many hard drives are used, whether writing is carried out on all the drives in real time or just on a single one, and how the information is synchronized between the drives - whether it is recorded in blocks on one drive after another or all of it is mirrored from one on the others. All of these factors mean that the error tolerance as well as the performance between the various RAID types can vary.

RAID in Shared Hosting

The hard drives which we employ for storage with our outstanding cloud web hosting platform are not the traditional HDDs, but extremely fast solid-state drives (SSD). They operate in RAID-Z - a special setup created for the ZFS file system which we use. All the content that you upload to your shared hosting account will be held on multiple disk drives and at least one shall be used as a parity disk. This is a specific drive where a further bit is added to any content copied on it. If a disk in the RAID stops working, it'll be changed without any service disturbances and the information will be recovered on the new drive by recalculating its bits thanks to the data on the parity disk along with that on the other disks. This is done in order to guarantee the integrity of the data and along with the real-time checksum authentication which the ZFS file system executes on all drives, you'll never need to concern yourself with the loss of any info no matter what.

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 known as RAID-Z. What is different about it is that at least 1 of the disks is used as a parity drive. In simple terms, whenever any data is copied on this special drive, one more bit is included to it and in the event that a malfunctioning disk is replaced, the information that will be cloned on it is a mix of the data on the other hard drives in the RAID and that on the parity one. This is done to make sure that the data is intact. During this process, your websites will be up and running normally since RAID-Z makes it possible for an entire drive to fail without any service interruptions and it simply works by using one of the other ones as the main production drive. Employing RAID-Z together with the ZFS file system that uses checksums to ensure that no data shall get silently corrupted on our servers, you'll never need to worry about the integrity of your files.