Redundant Array of Independent Disks, or RAID, is a method of saving content on multiple hard disk drives simultaneously. A RAID can be software or hardware depending on the HDDs which are used - physical or logical ones, yet what is common between them is that they all work as just one single unit where your information is kept. The top advantage of employing a RAID is redundancy as the information on all drives is exactly the same all of the time, so even if some drive fails for some reason, the info will still be available on the rest of the drives. The general performance is also better since the reading and writing processes will be split between multiple drives, so a single one will never be overloaded. There are different types of RAIDs where the performance and fault tolerance may differ depending on the exact setup - whether info is written on all the drives in real time or it is written on one drive and after that mirrored on another, the number of drives are used for the RAID, and so on.

RAID in Hosting

The SSD drives which our cutting-edge cloud hosting platform employs for storage work in RAID-Z. This sort of RAID is intended to work with the ZFS file system which runs on the platform and it employs the so-called parity disk - a special drive where data located on the other drives is copied with an extra bit added to it. In the event that one of the disks stops functioning, your sites shall continue working from the other ones and once we replace the malfunctioning one, the data that will be copied on it will be rebuilt from what is stored on the remaining drives as well as the information from the parity disk. This is done in order to be able to recalculate the elements of every file adequately and to validate the integrity of the information copied on the new drive. This is another level of security for the content that you upload to your hosting account along with the ZFS file system which compares a unique digital fingerprint for each file on all of the drives in real time.

RAID in Semi-dedicated Servers

The data uploaded to any semi-dedicated server account is kept on SSD drives which work in RAID-Z. One of the drives in type of a configuration is used for parity - any time data is copied on it, an additional bit is added. If a disk happens to be flawed, it will be taken out of the RAID without disturbing the work of the Internet sites as the data will load from the rest of the drives, and when a new drive is added, the information which will be duplicated on it will be a mix between the info on the parity disk and data kept on the other hard drives in the RAID. That is done in order to ensure that the data that is being cloned is accurate, so the moment the new drive is rebuilt, it could be included in the RAID as a production one. This is one more warranty for the integrity of your data since the ZFS file system which runs on our cloud web hosting platform analyzes a unique checksum of all of the copies of the files on the separate drives to avoid any chance of silent data corruption.

RAID in VPS Servers

The SSD drives which we use on the machines where we generate VPS servers work in RAID to make sure that any content which you upload will be available and intact all the time. At least one drive is employed for parity - one bit of data is added to any data copied on it. In the event that a main drive fails, it is replaced and the data that will be copied on it is calculated between the rest of the drives and the parity one. That’s done to ensure that the required information is copied and that no file is corrupted since the new drive will be used in the RAID afterwards. We also use hard disks 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 irrespective of any kind of unpredicted hardware failure.