RAID, or Redundant Array of Independent Disks, is a technology of saving data on a number hard drives that work together as a single logical unit. The drives could be physical or logical i.e. in the aforementioned case a single drive is divided into different ones through virtualization software. In any case, the same information is saved on all drives and the key advantage of using such a setup is that in the event that a drive stops working, the data will still be available on the other ones. Employing a RAID also improves the overall performance since the input and output operations will be spread among a few drives. There are several types of RAID based on how many hard drives are used, whether writing is done on all the drives in real time or just on a single one, and how the information is synchronized between the drives - whether it is recorded in blocks on one drive after another or it is mirrored from one on the others. These factors show that the fault tolerance and the performance between the various RAID types can vary.

RAID in Web Hosting

The SSD drives that our cutting-edge cloud web hosting platform employs for storage operate in RAID-Z. This kind of RAID is intended to work with the ZFS file system which runs on the platform and it takes advantage of the so-called parity disk - a specific drive where info saved on the other drives is cloned with an additional bit added to it. If one of the disks stops functioning, your websites shall continue working from the other ones and once we replace the faulty one, the data that will be cloned on it will be rebuilt from what is stored on the remaining drives along with the information from the parity disk. This is performed in order to be able to recalculate the elements of each file properly and to verify the integrity of the information cloned on the new drive. This is an additional level of security for the info that you upload to your web hosting account along with the ZFS file system that analyzes a unique digital fingerprint for each file on all hard drives in real time.

RAID in Semi-dedicated Hosting

In case you host your Internet sites in a semi-dedicated hosting account from our firm, any content that you upload will be stored on SSD drives which operate in RAID-Z. With this form of RAID, at least 1 of the hard disks is employed for parity - when data is synchronized between the disks, an extra bit is added to it on the parity one. The reasoning behind this is to ensure the integrity of the info which is cloned to a brand new drive if one of the disks in the RAID breaks down because the content being copied on the new disk is recalculated from the data on the standard drives and on the parity one. Another advantage of RAID-Z is that even in case a disk drive stops functioning, the system can easily switch to a different one quickly without service disruptions of any sort. RAID-Z adds an additional level of safety for the content you upload on our cloud hosting platform along with the ZFS file system which uses unique checksums so as to verify the integrity of each file.

RAID in VPS Web Hosting

The SSD drives which 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 1 drive is used for parity - one bit of information is added to any data cloned on it. If a main drive fails, it is changed and the data which will be duplicated on it is calculated between the other drives and the parity one. It's done this way to make sure that the required info is copied and that no file is corrupted because the new drive will be incorporated into the RAID afterwards. We also 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 web hosting service because your content will be available on multiple drives regardless of any kind of unpredicted hardware failure.