Redundant Array of Independent Disks, or RAID, is a way of saving content on several hard disks at the same time. A RAID might be software or hardware depending on the hard drives that are used - physical or logical ones, but what’s common between them is the fact that they all work as just a single unit where data is stored. The key advantage of employing a RAID is redundancy since the information on all of the drives will be exactly the same all the time, so even in case one of the drives fails for some reason, the information will still be available on the remaining drives. The general performance is enhanced as well as the reading and writing processes can be split between a number of drives, so a single one will not be overloaded. There're different types of RAIDs where the capabilities and fault tolerance can vary according to the exact setup - whether information is written on all the drives in real time or it's written on one drive and afterwards mirrored on another, the number of drives are used for the RAID, etc.
RAID in Cloud Website Hosting
The SSD drives which our cutting-edge cloud hosting platform uses for storage work in RAID-Z. This type of RAID is created to work with the ZFS file system which runs on the platform and it uses the so-called parity disk - a special drive where data saved on the other drives is duplicated with an extra bit added to it. In the event that one of the disks fails, your sites shall continue working from the other ones and as soon as we replace the bad one, the information which will be duplicated on it will be rebuilt from what is stored on the rest of the drives along with the info from the parity disk. This is performed in order to be able to recalculate the bits of every file properly and to validate the integrity of the info cloned on the new drive. This is one more level of security for the info that you upload to your cloud website hosting account in addition to the ZFS file system which compares a special digital fingerprint for each file on all the drives in real time.
RAID in Semi-dedicated Servers
The RAID type that we use for the cloud Internet hosting platform where your semi-dedicated server account shall be created is referred to as RAID-Z. What is different about it is that at least 1 of the disks is used as a parity drive. Simply put, whenever any data is cloned on this specific hard drive, one more bit is included to it and in case a problematic disk is changed, the info which will be copied on it is a combination of the data on the remaining hard disks in the RAID and that on the parity one. It's done this way to guarantee that the information is intact. Throughout this process, your Internet sites will be functioning normally since RAID-Z makes it possible for a whole drive to fail without causing any service disturbances and it simply uses one of the other ones as the main production drive. Using RAID-Z together with the ZFS file system which uses checksums to guarantee that no data shall get silently corrupted on our servers, you will not need to worry about the integrity of your files.
RAID in VPS Servers
All VPS server accounts that we offer are made on physical servers which use SSD drives working in RAID. At least 1 drive is used for parity - one additional bit is included in the data copied on it and in case a main disk stops working, this bit makes it easier to recalculate the bits of the files on the damaged hard disk so that the correct info is restored on the new drive included in the RAID. At the same time, your sites will stay online because all the information will still load from at least one more disk drive. In case you add routine backups to your VPS package, a copy of the data will be saved on standard hard disks which also function in RAID as we want to make sure that any site content you add will be safe and sound at all times. Employing multiple drives in RAID for all of the main and backup servers allows us to offer fast and reliable hosting service.