RAID, which stands short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that allows a system to use several hard drives as a single logical unit. To put it differently, all the drives are used as one and the info on all of them is identical. Such a configuration has two major advantages over using just a single drive to keep data - the first is redundancy, so if one drive stops working, the info will be accessed from the remaining ones, and the second is better performance because the input/output, or reading/writing operations will be distributed among several drives. There are different RAID types depending on the number of drives are employed, whether reading and writing are both done from all of the drives simultaneously, if data is written in blocks on one drive after another or is mirrored between drives in the same time, etcetera. According to the particular setup, the fault tolerance and the performance may vary.
RAID in Shared Website Hosting
The disk drives which we use for storage with our revolutionary cloud web hosting platform are not the classic HDDs, but quick solid-state drives (SSD). They function in RAID-Z - a special setup intended for the ZFS file system which we employ. Any content that you add to your shared website hosting account will be held on multiple hard disks and at least one of them will be employed as a parity disk. This is a special drive where an additional bit is added to any content copied on it. In the event that a disk in the RAID stops functioning, it will be replaced without service disturbances and the data will be recovered on the new drive by recalculating its bits thanks to the data on the parity disk plus that on the other disks. This is done in order to guarantee the integrity of the data and together with the real-time checksum authentication which the ZFS file system executes on all drives, you'll never have to worry about losing any data no matter what.
RAID in Semi-dedicated Hosting
The data uploaded to any semi-dedicated hosting account is stored on SSD drives that work in RAID-Z. One of the drives in such a setup is used for parity - any time data is cloned on it, an extra bit is added. In case a disk turns out to be defective, it will be removed from the RAID without disturbing the functioning of the sites since the data will load from the remaining drives, and when a new drive is included, the information that will be duplicated on it will be a blend between the information on the parity disk and data stored on the other hard disks in the RAID. That is done to ensure that the information that is being duplicated is correct, so as soon as the new drive is rebuilt, it could be integrated into the RAID as a production one. This is one more warranty for the integrity of your data as the ZFS file system that runs on our cloud Internet hosting platform compares a unique checksum of all copies of the files on the separate drives to avoid any chance of silent data corruption.
RAID in VPS Web Hosting
The physical servers where we create virtual private server employ high-speed SSD drives which will increase the speed of your Internet sites substantially. The hard disks function in RAID to make sure that you will not lose any info because of a power loss or a hardware malfunction. The production servers employ a variety of 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, that makes it much easier to recover the site content without loss in case a main drive breaks down. If you choose our backup service, the data will be stored on an individual machine that uses standard hard-disk drives and though there's no parity one in this case, they are also in a RAID to ensure that we will have a backup of your website content all the time. With this particular setup your info will always be safe since it will be available on multiple disk drives.