RAID, which is short for 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 one single logical unit. In other words, all of the drives are used as one and the data on all of them is identical. This kind of a setup has 2 key advantages over using just a single drive to store data - the first is redundancy, so in the event that one drive doesn't work, the info will be accessed through the others, and the second is improved performance as the input/output, or reading/writing operations will be distributed among several drives. There are different RAID types depending on how many drives are used, whether reading and writing are both executed from all the drives simultaneously, if data is written in blocks on one drive after another or is mirrored between drives in the same time, and many others. According to the exact setup, the fault tolerance and the performance may differ.
RAID in Shared Web Hosting
The disk drives which we use for storage with our ground-breaking cloud web hosting platform are not the standard HDDs, but high-speed solid-state drives (SSD). They function in RAID-Z - a special setup created for the ZFS file system that we work with. Any content that you upload to your shared web hosting account will be stored on multiple disk drives and at least one of them shall be used as a parity disk. This is a specific drive where an extra bit is added to any content copied on it. If a disk in the RAID fails, it'll be changed without any service interruptions and the data will be recovered on the new drive by recalculating its bits using the data on the parity disk plus that on the remaining disks. This is done to ensure the integrity of the information and together with the real-time checksum authentication that the ZFS file system performs on all drives, you'll never need to worry about the loss of any information no matter what.
RAID in Semi-dedicated Servers
In case you host your websites inside a semi-dedicated server account from our firm, any content you upload will be kept on SSD drives which operate in RAID-Z. With this kind of RAID, at least one of the hard disks is used for parity - when data is synced between the disks, an extra bit is included in it on the parity one. The idea behind this is to ensure the integrity of the info that is duplicated to a new drive in the event that one of the disks in the RAID stops working as the content being copied on the brand new disk is recalculated from the data on the standard disk drives and on the parity one. An additional advantage of RAID-Z is that even in the event that a disk drive stops functioning, the system can easily switch to a different one promptly without service disruptions of any type. RAID-Z adds an extra level of security for the content you upload on our cloud Internet hosting platform in addition to the ZFS file system that uses unique checksums to verify the integrity of each and every file.
RAID in VPS Servers
The physical servers where we make VPS server work with super fast SSD drives that will raise the speed of your websites significantly. The drives operate in RAID to guarantee that you will not lose any info due to a power loss or a hardware breakdown. The production servers employ multiple drives where the info is kept and one disk is used for parity i.e. one bit is added to all of the data 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, your info will be stored on an independent machine that uses standard hard-disk drives and although there is no parity one in this case, they are also in a RAID to guarantee that we will have a backup copy of your content all the time. With this setup your information will always be safe because it will be available on multiple drives.