RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which allows a system to use several hard drives as a single logical unit. Simply put, all of the drives are used as one and the information on all of them is identical. This type of a setup has 2 huge advantages over using just a single drive to keep data - the first one is redundancy, so in case one drive fails, the info will be accessed from the remaining ones, and the second is better performance as the input/output, or reading/writing operations will be spread among multiple drives. There're different RAID types depending on what number of drives are used, whether reading and writing are both done from all the drives at the same time, whether data is written in blocks on one drive after another or is mirrored between drives in the same time, etcetera. Depending on the particular setup, the error tolerance and the performance may differ.
RAID in Shared Hosting
The cutting-edge cloud web hosting platform where all shared hosting accounts are created uses fast SSD drives instead of the standard HDDs, and they function in RAID-Z. With this setup, a number of hard disks operate together and at least a single one is a dedicated parity disk. Basically, when data is written on the rest of the drives, it is duplicated on the parity one adding an extra bit. This is carried out for redundancy as even in case some drive fails or falls out of the RAID for some reason, the information can be rebuilt and verified using the parity disk and the data recorded on the other ones, which means that not a thing will be lost and there will be no service disorders. This is one more level of protection for your info along with the cutting-edge ZFS file system which uses checksums to make sure that all data on our servers is undamaged and is not silently corrupted.
RAID in Semi-dedicated Servers
In case you host your Internet sites within a semi-dedicated server account from our firm, any content which you upload will be held on SSD drives which operate in RAID-Z. With this form of RAID, at least one of the hard disks is employed for parity - when data is synchronized between the drives, an additional bit is added to it on the parity one. The idea behind this is to ensure the integrity of the info which is duplicated to a new drive if one of the drives in the RAID stops functioning since 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 if a disk drive fails, the system can switch to a different one promptly without service disturbances of any type. RAID-Z adds one more level of security for the content which you upload on our cloud Internet hosting platform in addition to the ZFS file system which uses unique checksums as a way to authenticate the integrity of every single file.
RAID in VPS Servers
The SSD drives which we use on the machines where we set up VPS servers operate in RAID to make sure that any content which you upload will be available and intact at all times. At least one drive is employed for parity - one bit of information is added to any data copied on it. In case a main drive stops working, it is changed and the information that will be duplicated on it is calculated between the other drives and the parity one. That’s done to make sure that the correct data is copied and that not a single file is corrupted because the new drive will be incorporated into the RAID afterwards. Also, we use hard drives functioning in RAID on the backup servers, so in case you add this upgrade to your VPS plan, you'll use an even more reliable Internet hosting service as your content will be available on multiple drives irrespective of any type of unexpected hardware failure.