RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which enables a system to take advantage of multiple hard drives as a single logical unit. In other words, all drives are used as one and the info on all of them is the same. This kind of a configuration has 2 huge advantages over using just a single drive to save data - the first is redundancy, so if one drive doesn't work, the information will be accessible from the others, and the second one is improved performance as the input/output, or reading/writing operations will be distributed among multiple drives. There are different RAID types based on what number of drives are employed, if reading and writing are both handled from all the drives concurrently, whether data is written in blocks on one drive after another or is mirrored between drives in the same time, etcetera. Based on the exact setup, the fault tolerance and the performance may vary.
RAID in Shared Hosting
All the content that you upload to your new shared hosting account will be stored on fast SSD drives which work in RAID-Z. This setup is built to work with the ZFS file system which runs on our cloud Internet hosting platform and it adds another level of security for your content on top of the real-time checksum verification that ZFS uses to ensure the integrity of the data. With RAID-Z, the info is saved on several disks and at least 1 is a parity disk - whenever info is recorded on it, an extra bit is added, so in case any drive fails for whatever reason, the integrity of the data can be verified by recalculating its bits based on what is saved on the production hard disks and on the parity one. With RAID-Z, the operation of our system will never be interrupted and it'll continue functioning effectively until the problematic drive is replaced and the information is synchronized on it.
RAID in Semi-dedicated Hosting
The SSD drives that are used for saving any content uploaded to the semi-dedicated hosting accounts which we offer work in RAID-Z. This is a special setup where one or more drives are used for parity i.e. the system will add an additional bit to any data duplicated on such a drive. If a disk fails and is replaced with a new one, what information will be cloned on the latter shall be a mix calculated between the data on the other drives and that on the parity one. This is done to make sure that the information on the new drive shall be accurate. Throughout the procedure, the RAID will continue operating normally and the malfunctioning drive will not have an impact on the adequate operation of your sites in any way. Using SSDs in RAID-Z is an impressive addition to the ZFS file system which runs on our revolutionary cloud platform with regard to preserving the integrity of your files since ZFS uses special digital identifiers referred to as checksums in order to prevent silent data corruption.
RAID in VPS Hosting
The physical servers where we generate virtual private server employ super fast SSD drives that will increase the speed of your websites significantly. The disk drives work in RAID to guarantee that you won't lose any information because of a power loss or a hardware failure. The production servers employ many different drives where the data is stored and one disk is used for parity i.e. one bit is added to all of the information copied on it, which makes it much easier to restore the content without loss in case a main drive fails. If you use our backup service, your information will be stored on a separate machine which uses standard hard-disk drives and though there is no parity one in this case, they are also in a RAID to ensure that we will have a backup of your site content all the time. With this particular setup your data will always be safe since it will be available on multiple drives.