Redundant Array of Independent Disks, or RAID, is a way of keeping content on several hard drives simultaneously. A RAID could be software or hardware based on the drives which are used - physical or logical ones, but what’s common between them is the fact that they all function as just one single unit where info is saved. The main advantage of employing a RAID is redundancy because the information on all of the drives shall be exactly the same at all times, so even in case one of the drives fails for some reason, the information will still be available on the remaining drives. The general performance is enhanced as well as the reading and writing processes will be split between various drives, so a single one will never be overloaded. There are different sorts of RAIDs where the performance and fault tolerance could differ depending on the exact setup - whether information is written on all drives real-time or it is written on a single drive and after that mirrored on another, the number of drives are used for the RAID, and so on.
RAID in Hosting
The revolutionary cloud web hosting platform where all hosting
accounts are created uses quick SSD drives rather than the traditional HDDs, and they operate in RAID-Z. With this setup, several hard disk drives work together and at least a single one is a dedicated parity disk. In simple terms, when data is written on the remaining drives, it is duplicated 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 information can be rebuilt and verified thanks to the parity disk and the data saved on the other ones, thus practically nothing will be lost and there won't be any service interruptions. This is another level of protection for your data along with the revolutionary ZFS file system which uses checksums to make sure that all of the data on our servers is intact and is not silently corrupted.
RAID in Semi-dedicated Servers
If you host your websites inside a semi-dedicated server
account from our firm, all the content which you upload will be kept on SSD drives which work in RAID-Z. With this form of RAID, at least 1 of the hard drives is used for parity - when data is synced between the hard drives, an additional bit is included in it on the parity one. The reasoning behind this is to ensure the integrity of the data which is duplicated to a new drive in case one of the hard drives in the RAID stops working as the website 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 the fact that even in the event that a drive stops functioning, the system can switch to a different one quickly without service disruptions of any kind. RAID-Z adds one more level of security for the content that you upload on our cloud hosting platform along with the ZFS file system which uses unique checksums as a way to verify the integrity of each file.