RAID, or Redundant Array of Independent Disks, is a technology for keeping data on several hard disk drives that work together as a single logical unit. The drives could be physical or logical i.e. in the second case a single drive is divided into individual ones via virtualization software. In either case, the same info is stored on all the drives and the key benefit of using this type of a setup is that in case a drive fails, the data will remain available on the other ones. Employing a RAID also enhances the performance because the input and output operations will be spread among several drives. There are several kinds of RAID based on how many hard disks are used, whether writing is carried out on all the drives in real time or just on one, and how the information is synced between the hard drives - whether it is recorded in blocks on one drive after another or it is mirrored from one on the others. All of these factors indicate that the fault tolerance as well as the performance between the different RAID types can differ.
RAID in Web Hosting
The hard drives that we use for storage with our state-of-the-art cloud hosting platform are not the standard HDDs, but super fast solid-state drives (SSD). They operate in RAID-Z - a special setup created for the ZFS file system that we use. All the content that you add to your web hosting account will be stored on multiple drives and at least one of them will be employed as a parity disk. This is a special drive where an extra bit is included to any content copied on it. In case a disk in the RAID stops working, it'll be changed without service disturbances and the data will be rebuilt on the new drive by recalculating its bits using the data on the parity disk along with that on the other disks. This is done in order to guarantee the integrity of the info and together with the real-time checksum authentication which the ZFS file system performs on all drives, you'll never need to be concerned about the loss of any information no matter what.
RAID in Semi-dedicated Servers
In case you host your sites within a semi-dedicated server account from our company, any content which you upload will be held on SSD drives that work in RAID-Z. With this type of RAID, at least 1 of the hard drives is employed for parity - when data is synced between the disks, an additional bit is added to it on the parity one. The idea behind this is to ensure the integrity of the information that is duplicated to a new drive in the event that one of the disks in the RAID stops working since the site content being copied on the brand new disk is recalculated from the info on the standard drives and on the parity one. Another advantage of RAID-Z is the fact that even in case a drive stops working, the system can switch to a different one instantly without service disruptions of any type. RAID-Z adds an extra level of protection for the content you upload on our cloud web hosting platform together with the ZFS file system which uses unique checksums to validate the integrity of every single file.
RAID in VPS Servers
All VPS server accounts which our company offers are generated on physical servers which employ SSD drives working in RAID. At least 1 drive is used for parity - one additional bit is included in the info cloned on it and if a main disk stops working, this bit makes it much easier to recalculate the bits of the files on the damaged disk drive so that the correct data is restored on the new drive added to the RAID. At the same time, your Internet sites will remain online since all the info will still load from at least 1 other disk drive. In the event that you add regular backups to your VPS package, a copy of the data will be saved on standard hard disks that also operate in RAID since we want to make sure that any sort of website content you upload will be protected all the time. Working with multiple hard disks in RAID for all of the main and backup servers allows us to offer fast and reliable hosting service.