RAID, or Redundant Array of Independent Disks, is a technology of keeping data on several hard disks which function together as a single logical unit. The drives can be physical or logical i.e. in the second case one drive is divided into separate ones using virtualization software. In any case, the very same data is kept on all drives and the key advantage of employing this kind of a setup is that if a drive stops working, the data shall still be available on the remaining ones. Using a RAID also boosts the performance because the input and output operations will be spread among a couple of drives. There are several kinds of RAID dependant upon how many hard drives are used, whether writing is done on all the drives in real time or just on a single one, and how the information is synced between the drives - whether it's recorded in blocks on one drive after another or it is mirrored from one on the others. All of these factors imply that the fault tolerance as well as the performance between the various RAID types may differ.
RAID in Cloud Website Hosting
The drives which we use for storage with our ground-breaking cloud Internet hosting platform are not the classic HDDs, but super fast solid-state drives (SSD). They work in RAID-Z - a special setup developed for the ZFS file system which we use. Any content that you upload to your cloud website hosting account will be held on multiple drives and at least one will be used as a parity disk. This is a specific drive where a further bit is added to any content copied on it. In the event that a disk in the RAID stops functioning, it'll be replaced with no service interruptions and the data will be rebuilt on the new drive by recalculating its bits using the data on the parity disk plus that on the other disks. This is done so as to guarantee the integrity of the data and along with the real-time checksum verification which the ZFS file system performs on all drives, you won't ever have to be concerned about losing any data no matter what.
RAID in Semi-dedicated Hosting
The RAID type which we use for the cloud web hosting platform where your semi-dedicated hosting account will be created is named RAID-Z. What is different about it is that at least one of the disks is employed as a parity drive. Put simply, whenever any kind of data is duplicated on this particular drive, one more bit is included to it and in the event that a malfunctioning disk is replaced, the info that will be copied on it is a combination of the data on the other hard drives in the RAID and that on the parity one. This is done to guarantee that the data is intact. During this process, your Internet sites will be functioning normally because RAID-Z makes it possible for a whole drive to fail without any service disruptions and it simply works by using one of the other ones as the main production drive. Employing RAID-Z together with the ZFS file system which uses checksums to guarantee that no data shall get silently corrupted on our servers, you won't have to worry about the integrity of your files.
All virtual private server accounts that we offer are created on physical servers that use SSD drives functioning in RAID. At least one drive is used for parity - one additional bit is added to the information duplicated on it and if a main disk breaks down, this bit makes it easier to recalculate the bits of the files on the damaged hard disk so that the accurate info is recovered on the new drive included in the RAID. Meanwhile, your Internet sites will still be online because all the information will still load from at least 1 other hard disk. If you add regular backups to your VPS plan, a copy of your information will be saved on standard hard disks which also operate in RAID since we want to make sure that any kind of content you add will be protected at all times. Employing multiple hard disks in RAID for all the main and backup servers permits us to offer fast and reliable web hosting service.