RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which allows a system to take advantage of several hard drives as a single logical unit. Put simply, all drives are used as one and the information on all of them is the same. Such a setup has two huge advantages over using a single drive to keep data - the first is redundancy, so if one drive doesn't work, the info will be accessed through the remaining ones, and the second is improved performance since the input/output, or reading/writing operations will be distributed among multiple drives. There are different RAID types in accordance with what amount of drives are used, whether reading and writing are both executed 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 so on. Depending on the exact setup, the fault tolerance and the performance may vary.
RAID in Cloud Website Hosting
Our state-of-the-art cloud hosting platform where all cloud website hosting accounts are generated employs super fast SSD drives as an alternative to the traditional HDDs, and they work in RAID-Z. With this setup, numerous hard disks work together and at least a single one is a dedicated parity disk. Put simply, when data is written on the remaining drives, it's copied on the parity one adding an extra bit. This is carried out for redundancy as even if some drive fails or falls out of the RAID for some reason, the data can be rebuilt and verified thanks to the parity disk and the data stored on the other ones, thus nothing will be lost and there will not be any service disturbances. This is another level of protection for your information along with the state-of-the-art ZFS file system that uses checksums to make sure that all of the data on our servers is undamaged and is not silently corrupted.
RAID in Semi-dedicated Hosting
If you host your sites within a semi-dedicated hosting account from our company, all the content which you upload will be kept on SSD drives which operate in RAID-Z. With this type of RAID, at least 1 of the disks is employed for parity - when data is synchronized between the disks, an additional bit is included in it on the parity one. The purpose behind this is to guarantee the integrity of the information that is cloned to a brand new drive in the event that one of the disks in the RAID breaks down since the site content being copied on the new disk is recalculated from the information on the standard disk drives and on the parity one. Another advantage of RAID-Z is the fact that even if a drive stops working, the system could switch to a different one immediately without service interruptions of any sort. RAID-Z adds one more level of security for the content you upload on our cloud hosting platform in addition to the ZFS file system that uses unique checksums as a way to authenticate the integrity of every single file.
RAID in VPS
The SSD drives that we use on the physical machines where we create virtual private servers operate in RAID to make sure that any content which you upload will be available and intact all of the time. At least a single drive is used for parity - one bit of data is added to any data cloned on it. In the event that a main drive fails, it is replaced and the data which will be cloned on it is calculated between the rest of the drives and the parity one. That’s done to ensure that the needed information is copied and that not a single file is corrupted because the new drive will be incorporated into the RAID afterwards. Also, we use hard disk drives working in RAID on the backup servers, so if you add this upgrade to your VPS package, you'll use an even more reliable Internet hosting service as your content will be available on multiple drives regardless of any unpredicted hardware malfunction.