Redundant Array of Independent Disks, or RAID, is a way of storing content on several hard disks at the same time. A RAID might be software or hardware depending on the hard drives that are used - physical or logical ones, yet what’s common between them is that they all function as just one single unit where info is stored. The biggest advantage of employing a RAID is redundancy as the info on all drives shall be the same all of the time, so even if a drive fails for some reason, the data will still be available on the remaining drives. The general performance is also better because the reading and writing processes could be split between various drives, so a single one can't be overloaded. There are different types of RAIDs where the efficiency and fault tolerance can vary according to the exact setup - whether data is written on all drives in real time or it is written on one drive and then mirrored on another, the number of drives are used for the RAID, and many others.
RAID in Shared Website Hosting
Our state-of-the-art cloud Internet hosting platform where all shared website hosting accounts are generated employs quick SSD drives as an alternative to the standard HDDs, and they work in RAID-Z. With this configuration, several hard drives operate together and at least a single one is a dedicated parity disk. Put simply, when data is written on the other drives, it is duplicated on the parity one adding an extra bit. This is performed for redundancy as even if a drive fails or falls out of the RAID for some reason, the data can be rebuilt and verified thanks to the parity disk and the data saved on the other ones, which means that practically nothing will be lost and there will be no service disturbances. This is an additional level of security for your info together with the cutting-edge ZFS file system that uses checksums to guarantee that all of the data on our servers is undamaged and is not silently corrupted.
RAID in Semi-dedicated Hosting
The RAID type which we employ for the cloud web 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 one of the disks is used as a parity drive. Simply put, whenever any data is cloned on this particular drive, one more bit is included to it and in case a faulty disk is replaced, the info that will be copied on it is a mix of the data on the remaining disk drives in the RAID and that on the parity one. It's done this way to guarantee that the information is intact. Throughout this process, your sites will be working normally since RAID-Z enables a whole drive to fail without causing any service disruptions and it simply uses one of the other ones as the main production drive. Employing RAID-Z together with the ZFS file system that uses checksums to ensure that no data can get silently corrupted on our servers, you won't need to worry about the integrity of your files.
The physical servers where we make virtual private server work with quick SSD drives which will increase the speed of your websites substantially. The drives operate in RAID to make sure that you will not lose any information because of a power loss or a hardware breakdown. The production servers use many different drives where the info is kept and one disk is used for parity i.e. one bit is added to all the info copied on it, which makes it much easier to restore the content without loss in case a main drive breaks down. In case you take advantage of our backup service, your data will be saved on an individual machine which uses standard hard-disk drives and despite the fact that there isn't a parity one in this case, they are also in a RAID to ensure that we will have a backup of your site content all of the time. With this particular setup your information will always be safe as it will be available on several drives.