Redundant Array of Independent Disks, or RAID, is a way of keeping content on a number of hard drives simultaneously. A RAID can be software or hardware based on the HDDs which are used - physical or logical ones, however what’s common between them is the fact that they all function as just one single unit where your information is saved. The main advantage of using a RAID is redundancy as the info on all the drives will be exactly the same at all times, so even in the event that one of the drives fails for whatever reason, the data will still be present on the rest of the drives. The general performance is enhanced as well as the reading and writing processes could be split between multiple drives, so a single one will not be overloaded. There're different kinds of RAIDs where the efficiency and fault tolerance could differ depending on the specific setup - whether information is written on all the drives real-time or it is written on a single drive and afterwards mirrored on another, what amount of drives are used for the RAID, etcetera.
RAID in Cloud Web Hosting
The revolutionary cloud web hosting platform where all cloud web hosting accounts are made employs fast SSD drives rather than the traditional HDDs, and they operate in RAID-Z. With this configuration, several hard drives operate together and at least a single one is a dedicated parity disk. In simple terms, when data is written on the rest of the drives, it's cloned on the parity one adding an extra bit. This is carried out for redundancy as even if a drive fails or falls out of the RAID for some reason, the data can be rebuilt and verified thanks to the parity disk and the data saved on the other ones, so nothing will be lost and there will be no service interruptions. This is another level of protection for your data in addition to the top-notch ZFS file system which uses checksums to guarantee that all data on our servers is undamaged and is not silently corrupted.
RAID in Semi-dedicated Hosting
The SSD drives which are used for holding any content uploaded to the semi-dedicated hosting accounts which we offer work in RAID-Z. This is a specific configuration where one or more disk drives are used for parity i.e. the system will add an extra bit to any data duplicated on this kind of a disk drive. In case that a disk fails and is substituted with a new one, what data will be duplicated on the latter shall be a mix calculated between the data on the remaining hard disks and that on the parity one. This is done to make sure that the data on the new drive shall be accurate. During the process, the RAID will continue operating normally and the faulty drive won't have an impact on the proper operation of your Internet sites by any means. Using SSDs in RAID-Z is an outstanding addition to the ZFS file system which runs on our cutting-edge cloud platform with respect to preserving the integrity of your files since ZFS uses special digital identifiers identified as checksums to avoid silent data corruption.
RAID in VPS Hosting
The physical servers where we generate virtual private server use quick SSD drives that will boost the speed of your sites considerably. The drives work in RAID to make sure that you won't lose any information due to a power loss or a hardware malfunction. The production servers use many different drives where the information is saved and one disk is used for parity i.e. one bit is added to all of the information copied on it, which makes it easier to restore the site content without loss if a main drive stops working. In case you take advantage of our backup service, the information will be saved on an independent machine which uses standard hard-disk drives and even though there isn't a parity one in this case, they are also in a RAID to make sure that we will have a backup copy of your content at all times. With this particular setup your data will always be safe as it will be available on a lot of drives.