RAID, or Redundant Array of Independent Disks, is a technology for saving data on multiple hard drives that operate together as one logical unit. The drives can be physical or logical i.e. in the aforementioned case a single drive is divided into independent ones using virtualization software. In any case, identical information is kept on all of the drives and the basic advantage of employing this type of a setup is that if a drive breaks down, the data will still be available on the remaining ones. Having a RAID also boosts the performance since the input and output operations will be spread among a number of drives. There are several kinds of RAID based on how many drives are used, whether writing is done on all the drives in real time or just on one, and how the info is synchronized between the hard drives - whether it's written in blocks on one drive after another or all of it is mirrored from one on the others. These factors indicate that the fault tolerance and the performance between the different RAID types may differ.
RAID in Shared Hosting
The SSD drives that our cutting-edge cloud web hosting platform uses for storage function in RAID-Z. This sort of RAID is developed to work with the ZFS file system that runs on the platform and it employs the so-called parity disk - a special drive where information located on the other drives is copied with an extra bit added to it. In the event that one of the disks fails, your Internet sites shall continue working from the other ones and as soon as we replace the bad one, the data that will be duplicated on it will be recovered from what is stored on the other drives as well as the information from the parity disk. This is performed in order to be able to recalculate the elements of each file properly and to authenticate the integrity of the data cloned on the new drive. This is another level of security for the information you upload to your shared hosting account along with the ZFS file system that compares a special digital fingerprint for each and every file on all hard drives in real time.
RAID in Semi-dedicated Hosting
The RAID type which we use for the cloud hosting platform where your semi-dedicated hosting account shall be created is known as RAID-Z. What is different about it is that at least one of the disks is employed as a parity drive. In simple terms, whenever any data is cloned on this particular hard drive, one more bit is added to it and in case a malfunctioning disk is replaced, the info which will be cloned 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 make sure that the information is intact. Throughout this process, your sites will be working normally as RAID-Z enables an entire drive to fail without causing any service interruptions and it simply works by using one of the remaining ones as the main production drive. Employing RAID-Z together with the ZFS file system that uses checksums to ensure that no data will get silently corrupted on our servers, you won't ever have to worry about the integrity of your files.
RAID in VPS Hosting
All virtual private server accounts which we provide are generated on physical servers which employ SSD drives operating in RAID. At least one drive is used for parity - one additional bit is included in the data duplicated on it and if a main disk stops working, this bit makes it much simpler to recalculate the bits of the files on the failed disk drive so that the accurate info is restored on the new drive included in the RAID. At the same time, your websites will still be online as all the info will still load from at least one other hard disk. If you add routine backups to your VPS plan, a copy of your information will be stored on standard hard disks which also work in RAID as we want to make certain that any sort of site content you add will be protected all the time. Working with multiple drives in RAID for all of the main and backup servers allows us to offer fast and reliable web hosting service.