Redundant Array of Independent Disks, or RAID, is a method of saving content on multiple hard disk drives simultaneously. A RAID might be software or hardware based on the HDDs which are used - physical or logical ones, yet what is common between them is the fact that they all work as one single unit where data is kept. The main advantage of using a RAID is redundancy because the information on all drives will be 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 rest of the drives. The general performance is also better because the reading and writing processes can be split between multiple drives, so a single one will not be overloaded. There are different kinds of RAIDs where the efficiency and fault tolerance can vary according to the exact setup - whether information is written on all drives in real time or it's written on one drive and afterwards mirrored on another, what amount of drives are used for the RAID, etcetera.
RAID in Cloud Hosting
The drives that we employ for storage with our top-notch cloud web hosting platform are not the standard HDDs, but quick solid-state drives (SSD). They work in RAID-Z - a special setup designed for the ZFS file system that we employ. All the content that you add to the cloud hosting account will be kept on multiple hard disks and at least one of them shall be employed as a parity disk. This is a special drive where a further bit is included to any content copied on it. In case a disk in the RAID stops working, it will be changed without service interruptions and the data will be rebuilt on the new drive by recalculating its bits thanks to the data on the parity disk plus that on the remaining disks. This is done so as to guarantee the integrity of the information and along with the real-time checksum authentication 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 VPS Servers
The physical servers where we create VPS server use super fast SSD drives which will increase the speed of your Internet sites noticeably. The disk drives function in RAID to make sure that you will not lose any data because of a power loss or a hardware breakdown. The production servers use many different drives where the data is kept and one disk is used for parity i.e. one bit is added to all data copied on it, which makes it easier to restore the website content without loss in case a main drive stops working. In case you take advantage of our backup service, the information will be saved on an individual machine which uses standard hard-disk drives and though there's no parity one in this case, they are also in a RAID to ensure that we will have a backup of your website content all the time. With this particular setup your info will always be safe because it will be available on many disk drives.