RAID, or Redundant Array of Independent Disks, is a technology of saving data on a number hard disks that function together as one logical unit. The drives can be physical or logical i.e. in the latter case one single drive is split into independent ones through virtualization software. In either case, the very same info is stored on all the drives and the basic advantage of employing this kind of a setup is that in the event that a drive fails, the data will remain available on the other ones. Employing a RAID also boosts the performance since the input and output operations will be spread among a few drives. There are several types of RAID depending on how many hard disks are used, whether writing is done on all the drives in real time or just on a single one, and how the info is synced between the drives - whether it is written in blocks on one drive after another or it is mirrored from one on the others. All these factors suggest that the fault tolerance as well as the performance between the various RAID types could differ.

RAID in Cloud Web Hosting

The hard disks which we employ for storage with our ground-breaking cloud web hosting platform are not the classic HDDs, but quick solid-state drives (SSD). They work in RAID-Z - a special setup designed for the ZFS file system that we use. All the content that you add to your cloud web hosting account will be kept on multiple drives and at least one will be used as a parity disk. This is a special drive where a further bit is added to any content copied on it. In case a disk in the RAID stops working, it will be replaced with no service disturbances and the info will be rebuilt on the new drive by recalculating its bits using the data on the parity disk plus that on the remaining disks. This is done so as to ensure the integrity of the data and along with the real-time checksum validation which the ZFS file system runs on all drives, you'll never need to concern yourself with the loss of any information no matter what.

RAID in Semi-dedicated Hosting

The RAID type that we employ for the cloud hosting platform where your semi-dedicated hosting account shall be created is referred to as RAID-Z. What's different about it is that at least 1 of the disks is used as a parity drive. Simply put, whenever any kind of data is duplicated on this specific hard drive, one more bit is included to it and if a problematic disk is replaced, the data which will be copied on it is a combination of the data on the other disk drives in the RAID and that on the parity one. We do this to make sure that the info is intact. Throughout this process, your Internet sites will be up and running normally because RAID-Z makes it possible for an entire drive to fail without causing any service disruptions and it simply uses one of the remaining ones as the main production drive. Using RAID-Z together with the ZFS file system which uses checksums to warrant that no data shall get silently corrupted on our servers, you will never need to worry about the integrity of your files.

RAID in VPS

The SSD drives that we use on the physical machines where we set up virtual private servers work in RAID to ensure that any content you upload will be available and intact at all times. At least one drive is used for parity - one bit of info is added to any data copied on it. In the event that a main drive stops working, it is replaced and the info that will be duplicated on it is calculated between the rest of the drives and the parity one. It's done this way to ensure that the needed info is copied and that no file is corrupted as the new drive will be included in the RAID afterwards. In addition, we use hard drives working in RAID on the backup servers, so in case you add this upgrade to your VPS plan, you will use an even more reliable Internet hosting service since your content will be available on multiple drives regardless of any kind of unexpected hardware malfunction.