RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that permits a system to employ multiple hard drives as a single logical unit. Simply put, all drives are used as one and the info on all of them is identical. Such a setup has two huge advantages over using a single drive to keep data - the first one is redundancy, so in case one drive stops working, the info will be accessed from the others, and the second one is improved performance because the input/output, or reading/writing operations will be spread among different drives. There are different RAID types depending on what amount of drives are employed, whether reading and writing are both executed from all of the drives simultaneously, if data is written in blocks on one drive after another or is mirrored between drives in the same time, and so on. Based on the particular setup, the error tolerance and the performance vary.

RAID in Shared Web Hosting

The SSD drives that our cutting-edge cloud hosting platform uses for storage work in RAID-Z. This type of RAID is developed to work with the ZFS file system which runs on the platform and it takes advantage of the so-called parity disk - a special drive where data stored on the other drives is copied with an extra bit added to it. In the event that one of the disks stops working, your Internet sites will continue working from the other ones and once we replace the bad one, the information that will be cloned on it will be rebuilt from what is stored on the other drives as well as the data from the parity disk. This is performed in order to be able to recalculate the bits of every single file properly and to validate the integrity of the data duplicated on the new drive. This is another level of security for the info which you upload to your shared web hosting account along with the ZFS file system that compares a unique digital fingerprint for each file on all of the hard drives in real time.

RAID in Semi-dedicated Servers

The info uploaded to any semi-dedicated server account is saved on SSD drives that operate in RAID-Z. One of the drives in such a setup is used for parity - whenever data is cloned on it, an extra bit is added. If a disk turns out to be flawed, it will be removed from the RAID without disturbing the operation of the websites since the data will load from the remaining drives, and when a brand new drive is included, the data which will be copied on it will be a mix between the information on the parity disk and data kept on the other drives in the RAID. That is done in order to guarantee that the info which is being copied is correct, so as soon as the new drive is rebuilt, it could be included in the RAID as a production one. This is an extra warranty for the integrity of your info as the ZFS file system which runs on our cloud web hosting platform analyzes a special checksum of all the copies of the files on the various drives to avoid any probability of silent data corruption.

RAID in VPS Servers

In case you use one of our VPS server solutions, any content that you upload will be stored on SSD drives that function in RAID. At least a single drive is intended for parity so as to guarantee the integrity of the information. In simple terms, this is a special drive where information is copied with one bit added to it. In case a disk from the RAID stops functioning, your sites will continue working and when a new disk replaces the malfunctioning one, the bits of the data that will be duplicated on it are calculated using the healthy and the parity drives. That way, any potential for corrupting data throughout the process is averted. We also use standard hard disk drives which work in RAID for storing backups, so should you add this service to your VPS plan, your site content will be saved on multiple drives and you will never have to worry about its integrity even in the event of multiple drive breakdowns.