RAID, which is short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which enables a system to take advantage of several hard drives as one single logical unit. Put simply, all of the drives are used as one and the data on all of them is the same. Such a configuration has two major advantages over using a single drive to save data - the first one is redundancy, so in the event that one drive stops working, the information will be accessed from the remaining ones, and the second is improved performance since the input/output, or reading/writing operations will be distributed among different drives. There're different RAID types in accordance with the number of drives are used, whether reading and writing are both executed from all drives at the same time, 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 exact setup, the error tolerance and the performance could differ.

RAID in Shared Hosting

The SSD drives which our cutting-edge cloud Internet hosting platform uses 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 uses the so-called parity disk - a specific drive where information saved on the other drives is duplicated with an extra bit added to it. In case one of the disks stops working, your sites shall continue working from the other ones and as soon as we replace the problematic one, the info which will be cloned on it will be rebuilt from what is stored on the rest of the drives along with the data from the parity disk. This is done so as to be able to recalculate the elements of every file properly and to validate the integrity of the data copied on the new drive. This is another level of security for the content which you upload to your shared hosting account along with the ZFS file system that compares a unique digital fingerprint for each file on all of the drives in real time.

RAID in Semi-dedicated Servers

The info uploaded to any semi-dedicated server account is saved on SSD drives that work in RAID-Z. One of the drives in this kind of a setup is used for parity - any time data is copied on it, an extra bit is added. If a disk turns out to be problematic, it will be removed from the RAID without disturbing the functioning of the sites because the data will load from the other drives, and when a new drive is added, the info that will be copied on it will be a mix between the data on the parity disk and data saved on the other hard disks in the RAID. This is done to guarantee that the info that is being duplicated is accurate, so as soon as the new drive is rebuilt, it could be integrated into the RAID as a production one. This is an additional warranty for the integrity of your information as the ZFS file system which runs on our cloud hosting platform compares a unique checksum of all the copies of the files on the various drives to be able to avoid any chance of silent data corruption.

RAID in VPS Servers

The physical servers where we create VPS server employ fast SSD drives which will increase the speed of your sites noticeably. The drives function in RAID to ensure that you won't lose any data as a result of a power loss or a hardware malfunction. The production servers take advantage of many different drives where the information is kept and one disk is used for parity i.e. one bit is added to all the information copied on it, that makes it easier to recover the website content without loss in case a main drive breaks down. If you pick our backup service, the info will be saved on an independent machine which uses standard hard-disk drives and though there is no parity one in this case, they are also in a RAID to ensure that we will have a backup copy of your site content at all times. With this particular configuration your info will always be safe since it will be available on a lot of drives.