RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which enables a system to employ multiple hard drives as one single logical unit. Put simply, all the drives are used as one and the information on all of them is the same. This kind of a setup has 2 major advantages over using just a single drive to save data - the first is redundancy, so if one drive breaks down, the data will be accessible from the remaining ones, and the second is better performance because the input/output, or reading/writing operations will be distributed among multiple drives. There're different RAID types in accordance with what amount of drives are used, if reading and writing are both performed 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 error tolerance and the performance vary.

RAID in Cloud Website Hosting

The disk drives which we employ for storage with our ground-breaking cloud web hosting platform are not the classic HDDs, but fast solid-state drives (SSD). They work in RAID-Z - a special setup developed for the ZFS file system that we work with. Any content that you upload to the cloud website hosting account will be saved on multiple disk drives and at least one of them shall be employed as a parity disk. This is a special drive where an extra bit is included to any content copied on it. In the event that a disk in the RAID stops functioning, it'll be changed without any service interruptions and the information will be rebuilt on the new drive by recalculating its bits thanks to the data on the parity disk plus that on the other disks. This is done in order to guarantee the integrity of the information and along with the real-time checksum verification that the ZFS file system runs on all drives, you'll never have to be concerned about the loss of any data no matter what.

RAID in Semi-dedicated Servers

The RAID type that we use for the cloud web hosting platform where your semi-dedicated server account shall be created is known as RAID-Z. What's different about it is that at least one of the disks is employed as a parity drive. In simple terms, whenever any data is cloned on this special disk drive, one more bit is added to it and if a problematic disk is replaced, the data that will be duplicated on it is a combination of the data on the remaining drives in the RAID and that on the parity one. This is done to ensure that your information is intact. Throughout this process, your websites will be working normally because RAID-Z allows for an entire drive to fail without causing any service interruptions and it simply uses one of the other ones as the main production drive. Using RAID-Z together with the ZFS file system which uses checksums to ensure that no data will get silently corrupted on our servers, you'll never need to worry about the integrity of your files.