RAID, or Redundant Array of Independent Disks, is a technology of saving data on multiple hard drives which function together as one single logical unit. The drives can be physical or logical i.e. in the latter case one drive is divided into individual ones via virtualization software. Either way, the same info is stored on all of the drives and the basic benefit of using such a setup is that if a drive fails, the data shall still be available on the remaining ones. Having a RAID also improves the performance because the input and output operations will be spread among a few drives. There are several kinds of RAID depending on how many drives are used, whether writing is done on all of the drives in real time or just on a single one, and how the info is synced between the hard drives - whether it's recorded in blocks on one drive after another or all of it is mirrored from one on the others. All of these factors mean that the fault tolerance and the performance between the various RAID types could differ.
RAID in Website Hosting
The cutting-edge cloud Internet hosting platform where all website hosting
accounts are made uses quick SSD drives as opposed to the standard HDDs, and they function in RAID-Z. With this setup, a number of hard disk drives operate together and at least 1 is a dedicated parity disk. Basically, when data is written on the remaining drives, it is cloned on the parity one adding an extra bit. This is performed for redundancy as even in case some drive fails or falls out of the RAID for some reason, the information can be rebuilt and verified thanks to the parity disk and the data stored on the other ones, therefore practically nothing will be lost and there will be no service disorders. This is one more level of protection for your information together with the top-notch ZFS file system that uses checksums to ensure that all data on our servers is intact and is not silently corrupted.
RAID in Semi-dedicated Servers
The RAID type that we employ for the cloud hosting platform where your semi-dedicated server
account will be created is named RAID-Z. What is different about it is that at least 1 of the disks is employed as a parity drive. Simply put, whenever any kind of data is duplicated on this specific drive, one more bit is included to it and if a malfunctioning disk is changed, the data which will be copied on it is a combination of the data on the remaining drives in the RAID and that on the parity one. We do this to make sure that the info is intact. Throughout this process, your Internet sites will be working normally because RAID-Z makes it possible for a whole drive to fail without causing any service interruptions 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 ensure that no data can get silently corrupted on our servers, you will never have to worry about the integrity of your files.
RAID in VPS Servers
The physical servers where we create VPS server
employ fast SSD drives which will boost the speed of your Internet sites noticeably. The drives work in RAID to ensure that you won't lose any information as a result of a power loss or a hardware failure. The production servers use a variety of drives where the information is kept and one disk is used for parity i.e. one bit is added to all the data copied on it, which makes it much easier to restore the content without any loss in the event a main drive fails. In case you choose our backup service, the information will be saved on a separate machine that uses standard hard-disk drives and even though there isn't a parity one in this case, they are also in a RAID to guarantee that we will have a backup copy of your site content at all times. With this configuration your data will always be safe because it will be available on several disk drives.