Redundant Array of Independent Disks, or RAID, is a method of keeping content on multiple hard disk drives simultaneously. A RAID might be software or hardware depending on the HDDs that are used - physical or logical ones, still what’s common between them is that they all operate as just one single unit where data is kept. The top advantage of employing a RAID is redundancy since the data on all of the drives will be identical all the time, so even if a drive fails for some reason, the data will still be present on the rest of the drives. The overall performance is also enhanced since the reading and writing processes will be split between a number of drives, so a single one will never be overloaded. There're different sorts of RAIDs where the efficiency and fault tolerance can vary depending on the particular setup - whether your data is written on all of the drives in real time or it's 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 Internet hosting platform employs for storage work in RAID-Z. This type of RAID is created to work with the ZFS file system that runs on the platform and it employs the so-called parity disk - a specific drive where info kept on the other drives is copied with an additional bit added to it. In the event that one of the disks stops working, your sites will continue working from the other ones and as soon as we replace the bad one, the info that will be duplicated on it will be rebuilt from what is stored on the rest of the drives along with the data from the parity disk. This is performed in order to be able to recalculate the bits of every single file correctly and to authenticate the integrity of the info copied on the new drive. This is one more level of security for the info you upload to your cloud hosting account together with the ZFS file system which compares a unique digital fingerprint for each file on all the hard drives in real time.
RAID in Semi-dedicated Hosting
The RAID type which we use for the cloud web hosting platform where your semi-dedicated hosting account will be created is named RAID-Z. What is different about it is that at least one of the disks is employed as a parity drive. Simply put, whenever any kind of data is duplicated on this specific disk drive, one more bit is added to it and in case a malfunctioning disk is replaced, the information which will be copied on it is a mix of the data on the remaining hard disks in the RAID and that on the parity one. It's done this way to ensure that the information is intact. During this process, your Internet sites will be functioning normally as RAID-Z makes it possible for a whole drive to fail without service disruptions and it simply uses one of the remaining ones as the main production drive. Using RAID-Z together with the ZFS file system which uses checksums to warrant that no data will get silently corrupted on our servers, you'll never need to worry about the integrity of your files.