RAID, or Redundant Array of Independent Disks, is a technology of keeping data on a number hard disks that operate together as one single logical unit. The drives can be physical or logical i.e. in the latter case one single drive is divided into individual ones via virtualization software. In any case, the very same info is saved on all the drives and the main advantage of employing such a setup is that in case a drive stops working, the data shall still be available on the remaining ones. Having a RAID also enhances the overall performance since the input and output operations will be spread among a number of drives. There are several types of RAID based on how many hard disks are used, whether writing is done on all drives in real time or just on one, and how the info is synchronized between the hard drives - whether it's written in blocks on one drive after another or it is mirrored from one on the others. All of these factors mean that the fault tolerance and the performance between the different RAID types can vary.

RAID in Hosting

The SSD drives which our cutting-edge cloud web hosting platform employs for storage operate in RAID-Z. This kind of RAID is created to work with the ZFS file system which runs on the platform and it uses the so-called parity disk - a specific drive where info kept on the other drives is copied with an additional bit added to it. In case one of the disks stops working, your sites will continue working from the other ones and after we replace the problematic one, the info that will be duplicated on it will be recovered from what is stored on the other drives along with the info from the parity disk. This is performed in order to be able to recalculate the elements of every file properly and to confirm the integrity of the information duplicated on the new drive. This is one more level of security for the content that you upload to your hosting account along with the ZFS file system that analyzes a unique digital fingerprint for each file on all the disk drives in real time.

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 named 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 kind of data is cloned on this particular disk drive, one more bit is included to it and if a problematic disk is replaced, the data that will be copied on it is a combination of the data on the remaining hard drives in the RAID and that on the parity one. It's done this way to make sure that the data is intact. During this process, your Internet sites will be functioning normally as RAID-Z enables an entire drive to fail without service disturbances and it simply works by using one of the other ones as the main production drive. Using RAID-Z together with the ZFS file system which uses checksums to warrant that no data will get silently corrupted on our servers, you will never have to worry about the integrity of your files.

RAID in VPS Servers

The SSD drives that we use on the physical machines where we create VPS servers operate in RAID to make sure that any content that 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 copied on it. In the event that a main drive fails, it is changed and the information which will be copied on it is calculated between the remaining drives and the parity one. That’s done to make sure that the required info is copied and that not a single file is corrupted as the new drive will be a part of the RAID afterwards. Also, we use hard disk drives functioning in RAID on the backup servers, so if you add this upgrade to your VPS package, you'll use an even more reliable web hosting service because your content will be available on multiple drives regardless of any sort of unforeseen hardware malfunction.