Redundant Array of Independent Disks, or RAID, is a way of storing content on multiple hard disks at the same time. A RAID can be software or hardware depending on the drives that are used - physical or logical ones, yet what is common between them is that they all perform as just one single unit where data is stored. The top advantage of using a RAID is redundancy because the information on all of the drives shall be identical all of the time, so even in the event that one of the drives fails for some reason, the data will still be available on the rest of the drives. The general performance will also improve since the reading and writing processes will be split between a number of drives, so a single one can't be overloaded. There are different kinds of RAIDs where the efficiency and fault tolerance may differ depending on the exact setup - whether data is written on all drives in real time or it's written on one drive and after that mirrored on another, what amount of drives are used for the RAID, and so on.
RAID in Shared Hosting
Our cutting-edge cloud Internet hosting platform where all shared hosting
accounts are made employs quick SSD drives as an alternative to the classic HDDs, and they work in RAID-Z. With this setup, numerous hard disk drives operate together and at least one is a dedicated parity disk. In simple terms, when data is written on the remaining drives, it is copied on the parity one adding an extra bit. This is carried out for redundancy as even if a drive fails or falls out of the RAID for whatever reason, the data can be rebuilt and verified thanks to the parity disk and the data stored on the other ones, therefore not a thing will be lost and there won't be any service interruptions. This is one more level of security for your info along with the cutting-edge ZFS file system which uses checksums to ensure that all data on our servers is intact and is not silently corrupted.
RAID in Semi-dedicated Hosting
The RAID type which we employ for the cloud hosting platform where your semi-dedicated hosting
account will be created is called RAID-Z. What's different about it is that at least one of the disks is used as a parity drive. Simply put, whenever any kind of data is cloned on this specific disk drive, one more bit is added to it and in case a problematic disk is replaced, the data which will be duplicated on it is a mix of the data on the remaining drives in the RAID and that on the parity one. We do this to make sure that the data is intact. During this process, your websites will be working normally as RAID-Z allows for a whole drive to fail without causing any service interruptions and it simply works by using one of the remaining ones as the main production drive. Using RAID-Z together with the ZFS file system that uses checksums to guarantee that no data can get silently corrupted on our servers, you won't ever have to worry about the integrity of your files.
RAID in VPS
The SSD drives which we use on the physical machines where we create virtual private servers
work in RAID to make sure that any content you upload will be available and intact all of the time. At least 1 drive is employed for parity - one bit of data is added to any data copied on it. In case a main drive breaks down, it is changed and the info which will be copied on it is calculated between the rest of the drives and the parity one. It's done this way to ensure that the required info is copied and that not a single file is corrupted because the new drive will be included in the RAID afterwards. We also use hard drives operating in RAID on the backup servers, so if you add this upgrade to your VPS package, you shall use an even more reliable web hosting service since your content will be available on multiple drives irrespective of any kind of sudden hardware malfunction.