Redundant Array of Independent Disks, or RAID, is a method of keeping content on several hard disk drives simultaneously. A RAID can be software or hardware depending on the drives which are used - physical or logical ones, still what’s common between them is that they all function as just a single unit where info is saved. The top advantage of employing a RAID is redundancy because the info on all of the drives will be the same at all times, so even in the event that one of the drives fails for whatever reason, the data will still be available on the other drives. The general performance is also enhanced as the reading and writing processes will be split between different drives, so a single one can't be overloaded. There are different sorts of RAIDs where the effectiveness and fault tolerance can vary based on the particular setup - whether data is written on all drives in real time or it is written on one drive and afterwards mirrored on another, the number of drives are used for the RAID, and so on.
RAID in Web Hosting
The SSD drives that our cutting-edge cloud web hosting platform employs for storage function in RAID-Z. This sort 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 special drive where information kept on the other drives is duplicated with an extra bit added to it. If one of the disks stops functioning, your sites will continue working from the other ones and after we replace the problematic one, the info which will be cloned on it will be rebuilt from what is stored on the remaining drives as well as the info from the parity disk. This is performed so as to be able to recalculate the bits of each file properly and to confirm the integrity of the information duplicated on the new drive. This is another level of security for the content which you upload to your web hosting
account in addition to the ZFS file system that analyzes a unique digital fingerprint for each and every file on all hard drives in real time.
RAID in Semi-dedicated Hosting
The RAID type which we use for the cloud hosting platform where your semi-dedicated hosting
account shall be created is referred to as RAID-Z. What's different about it is that at least 1 of the disks is employed as a parity drive. Put simply, whenever any kind of data is copied on this special disk drive, one more bit is added to it and if a malfunctioning disk is replaced, the data which will be cloned on it is a mix of the data on the other hard disks in the RAID and that on the parity one. We do this to ensure that your information is intact. During this process, your sites will be functioning normally as RAID-Z allows for an entire drive to fail without causing any service disturbances and it simply works by using one of the other ones as the main production drive. Employing RAID-Z together with the ZFS file system which uses checksums to guarantee that no data will get silently corrupted on our servers, you'll never need to worry about the integrity of your files.