Redundant Array of Independent Disks, or RAID, is a way of saving content on multiple hard disks concurrently. A RAID could be software or hardware based on the hard drives which are used - physical or logical ones, still what is common between them is the fact that they all work as a single unit where your information is stored. The main advantage of employing a RAID is redundancy because the information on all drives will be the same all the time, so even in the event that some drive fails for some reason, the data will still be present on the rest of the drives. The overall performance is also better since the reading and writing processes will be split between various drives, so a single one won't be overloaded. There are different sorts of RAIDs where the functionality and fault tolerance could differ based on the exact setup - whether your data is written on all drives real-time or it is written on a single drive and then mirrored on another, the number of drives are used for the RAID, and so on.
RAID in Web Hosting
The hard drives which we employ for storage with our outstanding cloud hosting platform are not the standard HDDs, but quick solid-state drives (SSD). They work in RAID-Z - a special setup intended for the ZFS file system which we work with. Any content that you add to your web hosting account will be held on multiple hard disks and at least one will be used as a parity disk. This is a specific drive where an additional bit is included to any content copied on it. If a disk in the RAID fails, it will be replaced with no service disturbances and the information will be recovered on the new drive by recalculating its bits using the data on the parity disk along with that on the remaining disks. This is done so as to ensure the integrity of the data and along with the real-time checksum validation that the ZFS file system performs on all drives, you won't ever have to concern yourself with losing any info no matter what.
RAID in Semi-dedicated Servers
The RAID type that we use for the cloud hosting platform where your semi-dedicated server account shall be created is called 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 hard drive, one more bit is added to it and in case a malfunctioning disk is changed, the data that will be copied on it is a mix of the data on the remaining disk drives in the RAID and that on the parity one. We do this to guarantee that your info is intact. Throughout this process, your Internet sites will be functioning normally since RAID-Z allows for a whole drive to fail without service interruptions and it simply uses one of the remaining ones as the main production drive. Employing RAID-Z together with the ZFS file system that uses checksums to warrant that no data will 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 which our company offers are generated on physical servers that employ SSD drives operating in RAID. At least one drive is employed for parity - one additional bit is included in the data cloned on it and if a main disk stops working, this bit makes it simpler to recalculate the bits of the files on the failed hard disk so that the correct data is recovered on the new drive added to the RAID. In the mean time, your websites will stay online as all the data will still load from at least one other hard disk. If you add routine backups to your VPS plan, a copy of your data will be kept on standard hard disks which also operate in RAID since we would like to make certain that any type of content you add will be risk-free at all times. Using multiple drives in RAID for all of the main and backup servers allows us to offer fast and reliable Internet hosting service.