Redundant Array of Independent Disks, or RAID, is a way of saving content on multiple hard disks simultaneously. A RAID could be software or hardware based on the HDDs that are used - physical or logical ones, however what is common between them is that they all operate as just a single unit where info is saved. The key advantage of employing a RAID is redundancy because the data on all drives shall be the same all of the time, so even in the event that some drive fails for some reason, the data will still be available on the other drives. The general performance is enhanced as well because the reading and writing processes can be split between various drives, so a single one won't be overloaded. There are different kinds of RAIDs where the functionality and fault tolerance could differ depending on the specific setup - whether your data is written on all drives real-time or it's written on one drive and afterwards mirrored on another, the number of drives are used for the RAID, and many others.

RAID in Web Hosting

The SSD drives that our cutting-edge cloud web hosting platform uses for storage function in RAID-Z. This sort of RAID is intended to work with the ZFS file system that runs on the platform and it works by using the so-called parity disk - a specific drive where information located on the other drives is duplicated with an extra bit added to it. If one of the disks stops working, your websites shall continue working from the other ones and after we replace the problematic one, the information which will be copied on it will be recovered from what is stored on the remaining drives together with the data from the parity disk. This is performed so as to be able to recalculate the elements of each and every file adequately and to validate the integrity of the information copied on the new drive. This is one more level of security for the info which you upload to your web hosting account along with the ZFS file system that compares a unique digital fingerprint for every single file on all drives in real time.

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