Redundant Array of Independent Disks, or RAID, is a way of saving content on several hard disks simultaneously. A RAID could be software or hardware depending on the HDDs which are used - physical or logical ones, however what’s common between them is that they all work as just one single unit where data is stored. The key advantage of using a RAID is redundancy as the information on all the drives shall be exactly the same at all times, so even in the event that one of the drives fails for whatever reason, the information will still be available on the remaining drives. The overall performance is also better because the reading and writing processes will be split between multiple drives, so a single one won't be overloaded. There're different types of RAIDs where the functionality and fault tolerance can vary according to the exact setup - whether information is written on all drives real-time or it is written on a single drive and then mirrored on another, what amount of drives are used for the RAID, etc.

RAID in Cloud Hosting

The SSD drives that our cutting-edge cloud web hosting platform employs for storage work in RAID-Z. This type of RAID is designed to work with the ZFS file system that runs on the platform and it takes advantage of the so-called parity disk - a special drive where information kept on the other drives is duplicated with an additional bit added to it. In the event that one of the disks stops functioning, your websites shall continue working from the other ones and as soon as we replace the faulty one, the info that will be cloned on it will be rebuilt from what is stored on the other drives as well as the information from the parity disk. This is performed so as to be able to recalculate the elements of every file correctly and to confirm the integrity of the data copied on the new drive. This is one more level of security for the information that you upload to your cloud hosting account in addition to the ZFS file system that compares a unique digital fingerprint for each file on all the disk drives in real time.