Redundant Array of Independent Disks, or RAID, is a way of saving content on a number of hard disk drives at the same time. A RAID could be software or hardware depending on the HDDs that are used - physical or logical ones, however what is common between them is the fact that they all function as just one single unit where data is stored. The top advantage of using a RAID is redundancy because the info on all drives will be identical at all times, so even in case one of the drives fails for whatever reason, the info will still be present on the rest of the drives. The general performance will also improve since the reading and writing processes can be split between various drives, so a single one will not be overloaded. There are different kinds of RAIDs where the efficiency and fault tolerance may vary according to the specific setup - whether data is written on all the drives in real time or it is written on a single drive and then mirrored on another, the number of drives are used for the RAID, etc.
RAID in Web Hosting
Our advanced cloud hosting platform where all web hosting accounts are made uses super fast SSD drives as an alternative to the traditional HDDs, and they operate in RAID-Z. With this configuration, multiple hard disks work together and at least a single one is a dedicated parity disk. Simply put, when data is written on the other drives, it's copied on the parity one adding an extra bit. This is done for redundancy as even in case some drive fails or falls out of the RAID for whatever reason, the information can be rebuilt and verified thanks to the parity disk and the data saved on the other ones, so absolutely nothing will be lost and there will be no service interruptions. This is another level of security for your info in addition to the revolutionary ZFS file system that uses checksums to make sure that all data on our servers is intact and is not silently corrupted.
RAID in Semi-dedicated Servers
If you host your Internet sites in 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 type of RAID, at least one of the disks is used for parity - when data is synced between the disks, an extra bit is added to it on the parity one. The idea behind this is to ensure the integrity of the information which is cloned to a new drive in the event that one of the hard drives in the RAID breaks down because the content being copied on the brand new disk is recalculated from the data on the standard hard drives and on the parity one. An additional advantage of RAID-Z is that even in the event that a hard drive stops functioning, the system can switch to a different one right away without service disturbances of any sort. RAID-Z adds one more level of safety for the content you upload on our cloud hosting platform along with the ZFS file system which uses unique checksums to authenticate the integrity of each file.
RAID in VPS Servers
The physical servers where we make VPS server work with fast SSD drives which will raise the speed of your sites significantly. The hard drives operate in RAID to make sure that you will not lose any info as a result of a power loss or a hardware failure. The production servers work with multiple drives where the data is kept and one disk is used for parity i.e. one bit is added to all info copied on it, which makes it easier to restore the website content without loss in the event a main drive breaks down. If you take advantage of our backup service, the info will be kept on an individual machine that uses standard hard-disk drives and despite the fact that there is no parity one in this case, they are also in a RAID to guarantee that we will have a backup of your site content all the time. With this particular setup your info will always be safe as it will be available on many disk drives.