Redundant Array of Independent Disks, or RAID, is a way of storing content on multiple hard drives concurrently. A RAID could be software or hardware based on the HDDs which are used - physical or logical ones, however what’s common between them is that they all perform as one single unit where your information is stored. The biggest advantage of employing a RAID is redundancy since the info on all drives shall be identical all the time, so even if a drive fails for whatever reason, the information will still be present on the rest of the drives. The overall performance will also improve because the reading and writing processes can be split between various drives, so a single one will never be overloaded. There are different types of RAIDs where the functionality and fault tolerance could differ depending on the exact setup - whether your data is written on all drives in real time or it's written on one drive and after that mirrored on another, the number of drives are used for the RAID, and so on.

RAID in Shared Website Hosting

The SSD drives that our cutting-edge cloud Internet hosting platform employs for storage operate in RAID-Z. This type of RAID is intended to work with the ZFS file system which runs on the platform and it employs the so-called parity disk - a specific drive where data located on the other drives is copied with an additional 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 faulty one, the information which will be cloned on it will be rebuilt from what is stored on the rest of the drives along with the information from the parity disk. This is performed in order to be able to recalculate the elements of every single file correctly and to confirm the integrity of the information duplicated on the new drive. This is an additional level of security for the information which you upload to your shared website hosting account in addition to the ZFS file system which analyzes a special digital fingerprint for each file on all disk drives in real time.

RAID in Semi-dedicated Servers

The SSD drives which are used for storing any website content uploaded to the semi-dedicated server accounts that we provide work in RAID-Z. This is a special configuration where one or more hard drives are employed for parity i.e. the system will include an additional bit to any data copied on such a drive. In case that a disk fails and is substituted with another one, what data will be duplicated on the latter will be a combination calculated between the data on the other hard disks and that on the parity one. This is done to make sure that the information on the new drive shall be correct. Throughout the procedure, the RAID will continue working normally and the faulty drive will not have an impact on the proper operation of your websites in any way. Using SSDs in RAID-Z is a great addition to the ZFS file system which runs on our state-of-the-art cloud platform with regard to preserving the integrity of your files as ZFS uses specific digital identifiers known as checksums to prevent silent data corruption.