RAID, which is short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which enables a system to employ several hard drives as a single logical unit. Put simply, all the drives are used as one and the info on all of them is the same. Such a configuration has two huge advantages over using just a single drive to keep data - the first is redundancy, so in the event that one drive breaks down, the information will be accessed through the remaining ones, and the second is better performance because the input/output, or reading/writing operations will be distributed among several drives. You can find different RAID types depending on the number of drives are employed, whether reading and writing are both done from all of the drives at the same time, if data is written in blocks on one drive after another or is mirrored between drives in the same time, etc. Determined by the exact setup, the error tolerance and the performance may vary.

RAID in Website Hosting

The drives that we use for storage with our outstanding cloud hosting platform are not the classic HDDs, but quick solid-state drives (SSD). They work in RAID-Z - a special setup intended for the ZFS file system which we use. Any content that you upload to your website hosting account will be kept on multiple disk drives and at least one of them shall be used as a parity disk. This is a specific drive where an extra bit is included to any content copied on it. In case a disk in the RAID fails, it will be changed without service interruptions and the information will be recovered on the new drive by recalculating its bits using the data on the parity disk along with that on the other disks. This is done to guarantee the integrity of the data and along with the real-time checksum verification that the ZFS file system performs on all drives, you'll never need to worry about losing any information no matter what.

RAID in Semi-dedicated Servers

In case you host your sites within a semi-dedicated server account from our company, all the content that you upload will be held on SSD drives which operate in RAID-Z. With this form of RAID, at least 1 of the hard drives is used for parity - when data is synchronized between the drives, an extra bit is added to it on the parity one. The purpose behind this is to guarantee the integrity of the information that is cloned to a new drive in the event that one of the drives in the RAID fails as the content being copied on the new disk is recalculated from the data on the standard disk drives and on the parity one. Another advantage of RAID-Z is that even in case a drive stops functioning, the system can switch to a different one right away without service disruptions of any sort. RAID-Z adds an extra level of safety for the content that you upload on our cloud web hosting platform along with the ZFS file system that uses unique checksums as a way to validate the integrity of every single file.

RAID in VPS Servers

The SSD drives which we use on the physical machines where we generate VPS servers work in RAID to ensure that any content which you upload will be available and intact at all times. At least a single drive is used for parity - one bit of info is added to any data cloned on it. In case a main drive breaks down, it is replaced and the info that will be copied on it is calculated between the rest of the drives and the parity one. This is done to ensure that the required info is copied and that no file is corrupted since the new drive will be a part of 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 shall use an even more reliable web hosting service as your content will be available on multiple drives irrespective of any unexpected hardware malfunction.