RAID, or Redundant Array of Independent Disks, is a technology for keeping data on multiple hard drives that function together as one logical unit. The drives can be physical or logical i.e. in the aforementioned case one drive is divided into separate ones through virtualization software. In either case, the same information is saved on all the drives and the main benefit of using such a setup is that in case a drive stops working, the data will remain available on the other ones. Employing a RAID also enhances the overall performance as the input and output operations will be spread among a couple of drives. There are several types of RAID depending on how many drives are used, whether writing is carried out on all of the drives in real time or just on one, and how the data is synced between the hard drives - whether it is recorded in blocks on one drive after another or it is mirrored from one on the others. All of these factors indicate that the fault tolerance as well as the performance between the different RAID types can vary.

RAID in Cloud Website Hosting

The SSD drives which our cutting-edge cloud hosting platform uses for storage operate in RAID-Z. This type of RAID is intended to work with the ZFS file system that runs on the platform and it works by using the so-called parity disk - a specific drive where data kept on the other drives is duplicated with an extra bit added to it. In the event that one of the disks stops functioning, your Internet sites shall continue working from the other ones and once we replace the faulty one, the info that will be copied on it will be rebuilt from what is stored on the rest of the drives as well as the information from the parity disk. This is performed in order to be able to recalculate the elements of every file adequately and to validate the integrity of the information cloned on the new drive. This is another level of security for the info you upload to your cloud website hosting account along with the ZFS file system which analyzes a special digital fingerprint for each file on all the disk drives in real time.

RAID in Semi-dedicated Hosting

The info uploaded to any semi-dedicated hosting account is stored on SSD drives that operate in RAID-Z. One of the drives in such a configuration is used for parity - each time data is cloned on it, an additional bit is added. In case a disk happens to be flawed, it will be taken out of the RAID without disturbing the functioning of the websites as the data will load from the rest of the drives, and when a new drive is added, the data which will be duplicated on it will be a mix between the information on the parity disk and data kept on the other hard drives in the RAID. That is done in order to ensure that the info that is being cloned is correct, so as soon as the new drive is rebuilt, it can be integrated into the RAID as a production one. This is one more guarantee for the integrity of your info as the ZFS file system which runs on our cloud hosting platform compares a special checksum of all the copies of the files on the separate drives to avoid any chance of silent data corruption.

RAID in VPS Web Hosting

If you employ one of our virtual private server solutions, any content that you upload will be kept on SSD drives which function in RAID. At least 1 drive is intended for parity so as to guarantee the integrity of the data. In simple terms, this is a special drive where data is copied with one bit added to it. In case a disk part of the RAID stops functioning, your websites will continue working and when a new disk substitutes the malfunctioning one, the bits of the data that will be cloned on it are calculated using the healthy and the parity drives. That way, any potential for corrupting data during the process is averted. We also use regular hard disk drives that operate in RAID for storing backups, so in case you include this service to your VPS package, your site content will be stored on multiple drives and you won't ever have to worry about its integrity even in the event of multiple drive failures.