Redundant Array of Independent Disks, or RAID, is a method of keeping content on several hard disk drives concurrently. A RAID might be software or hardware depending on the hard drives which are used - physical or logical ones, however what is common between them is that they all function as one single unit where your information is saved. The biggest advantage of using a RAID is redundancy because the information on all of the drives is exactly the same at all times, so even in case a drive fails for whatever reason, the data will still be present on the rest of the drives. The general performance is also enhanced because the reading and writing processes will be split between various drives, so a single one won't be overloaded. There're different kinds of RAIDs where the effectiveness and fault tolerance could differ depending on the exact setup - whether information is written on all of the 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 Web Hosting
Any content that you upload to your new web hosting account will be saved on quick SSD drives which operate in RAID-Z. This configuration is built to employ the ZFS file system that runs on our cloud Internet hosting platform and it adds another level of protection for your site content on top of the real-time checksum authentication that ZFS uses to guarantee the integrity of the data. With RAID-Z, the info is stored on several disks and at least 1 is a parity disk - whenever data is recorded on it, an extra bit is added, so in case any drive stops working for some reason, the stability of the data can be verified by recalculating its bits in accordance with what is stored on the production disks and on the parity one. With RAID-Z, the functioning of our system will never be interrupted and it'll continue operating flawlessly until the problematic drive is replaced and the info is synchronized on it.