Redundant Array of Independent Disks, or RAID, is a way of saving content on a number of hard disks concurrently. A RAID might be software or hardware depending on the drives which are used - physical or logical ones, still what’s common between them is the fact that they all perform as a single unit where info is saved. The top advantage of employing a RAID is redundancy because the information on all drives is the same all the time, so even in the event that some drive fails for some reason, the information will still be present on the other drives. The general performance will also improve since the reading and writing processes can be split between a number of drives, so a single one won't be overloaded. There're different kinds of RAIDs where the effectiveness and fault tolerance could differ based on the exact setup - whether data is written on all drives in real time or it's written on a single drive and afterwards mirrored on another, the number of drives are used for the RAID, etcetera.
RAID in Cloud Web Hosting
The hard drives which we employ for storage with our outstanding cloud hosting platform are not the standard HDDs, but super fast solid-state drives (SSD). They operate in RAID-Z - a special setup developed for the ZFS file system which we use. All of the content that you upload to your cloud web hosting account will be saved on multiple drives and at least one shall 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 fails, it'll be replaced without service interruptions and the data will be recovered on the new drive by recalculating its bits thanks to the data on the parity disk along with that on the remaining disks. This is done so as to guarantee the integrity of the information and together with the real-time checksum verification that the ZFS file system performs on all drives, you'll never have to worry about the loss of any info no matter what.
RAID in Semi-dedicated Servers
The SSD drives that are used for saving any site content uploaded to the semi-dedicated server accounts which we provide function in RAID-Z. This is a special setup where one or more hard drives are used for parity i.e. the system will add an additional bit to any data duplicated on this kind of a hard drive. In case that a disk fails and is replaced with a new one, what info will be cloned on the latter shall be a combination calculated between the data on the remaining drives and that on the parity one. This is done to make sure that the info on the new drive will be correct. Throughout the procedure, the RAID will continue functioning normally and the problematic drive will not have an impact on the proper operation of your Internet sites at all. Working with SSDs in RAID-Z is an outstanding addition to the ZFS file system which runs on our revolutionary cloud platform in terms of preserving the integrity of your files since ZFS uses special digital identifiers identified as checksums in order to avoid silent data corruption.
RAID in VPS Servers
All VPS server accounts that our company offers are generated on physical servers that use SSD drives working in RAID. At least 1 drive is employed for parity - one extra bit is added to the information duplicated on it and in case a main disk stops working, this bit makes it much simpler to recalculate the bits of the files on the failed drive so that the correct information is restored on the new drive included in the RAID. Meanwhile, your sites will stay online since all the information will still load from at least 1 other drive. If you add routine backups to your VPS plan, a copy of the info will be saved on standard hard disks which also operate in RAID because we would like to make sure that any sort of site content you upload will be safe and sound all the time. Working with multiple hard drives in RAID for all main and backup servers permits us to offer fast and reliable hosting service.