RAID, or Redundant Array of Independent Disks, is a technology for storing data on a number hard drives that work together as one logical unit. The drives could be physical or logical i.e. in the aforementioned case a single drive is divided into individual ones through virtualization software. Either way, the same data is saved on all drives and the key advantage of employing such a setup is that if a drive breaks down, the data shall still be available on the other ones. Employing a RAID also improves the overall performance as the input and output operations will be spread among a number of drives. There are several kinds of RAID based on how many hard drives are used, whether writing is done on all of the drives in real time or just on a single one, and how the data is synced between the hard drives - whether it's written in blocks on one drive after another or it is mirrored from one on the others. All of these factors imply that the error tolerance and the performance between the various RAID types can vary.
RAID in Hosting
The state-of-the-art cloud hosting platform where all hosting accounts are generated uses super fast SSD drives as opposed to the standard HDDs, and they function in RAID-Z. With this configuration, a number of hard disk drives operate together and at least 1 is a dedicated parity disk. Put simply, when data is written on the other drives, it is cloned 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 some reason, the info can be rebuilt and verified using the parity disk and the data saved on the other ones, which means that not a single thing will be lost and there will be no service interruptions. This is an additional level of security for your info in addition to the advanced ZFS file system that uses checksums to guarantee that all data on our servers is undamaged and is not silently corrupted.
RAID in Semi-dedicated Servers
In case you host your websites inside a semi-dedicated server account from our firm, any content which you upload will be saved on SSD drives which operate in RAID-Z. With this kind of RAID, at least one of the disks is employed for parity - when data is synced between the hard drives, an extra bit is added to it on the parity one. The purpose behind this is to ensure the integrity of the data that is cloned to a new drive in the event that one of the hard drives in the RAID fails as the content being copied on the brand new disk is recalculated from the data on the standard hard drives and on the parity one. Another advantage of RAID-Z is the fact that even if a hard drive stops functioning, the system could switch to another one right away without service disruptions of any sort. RAID-Z adds an extra level of safety for the content that you upload on our cloud Internet hosting platform in addition to the ZFS file system which uses unique checksums to authenticate the integrity of each file.
RAID in VPS Servers
The physical servers where we create VPS server work with quick SSD drives that will increase the speed of your websites considerably. The disk drives operate in RAID to guarantee that you won't lose any info due to a power loss or a hardware malfunction. The production servers employ a variety of drives where the data is stored and one disk is used for parity i.e. one bit is added to all the information copied on it, that makes it much easier to restore the content without loss in case a main drive breaks down. If you pick our backup service, your info will be stored on an individual machine which uses standard hard-disk drives and although there's no parity one in this case, they are also in a RAID to guarantee that we will have a backup copy of your website content all the time. With this kind of configuration your data will always be safe since it will be available on many disk drives.