RAID, which stands short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that makes it possible for a system to take advantage of many hard drives as a single logical unit. In other words, all of the drives are used as one and the information on all of them is the same. This kind of a setup has 2 key advantages over using just a single drive to save data - the first is redundancy, so in case one drive stops working, the information will be accessible from the remaining ones, and the second is improved performance because the input/output, or reading/writing operations will be spread among a number of drives. There're different RAID types depending on what number of drives are employed, whether reading and writing are both performed 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, etc. According to the exact setup, the error tolerance and the performance may differ.
RAID in Shared Hosting
All of the content that you upload to your new shared hosting account will be saved on quick SSD drives that operate in RAID-Z. This setup is built to employ the ZFS file system which runs on our cloud web hosting platform and it adds another level of protection for your content on top of the real-time checksum verification which ZFS uses to ensure the integrity of the data. With RAID-Z, the info is saved on a number of disks and at least one of them is a parity disk - whenever info is written on it, an extra bit is added, so in case any drive fails for some reason, the integrity of the data can be verified by recalculating its bits in accordance with what is stored on the production hard disks and on the parity one. With RAID-Z, the operation of our system won't be interrupted and it will continue operating efficiently until the problematic drive is changed and the information is synced on it.
RAID in Semi-dedicated Servers
In case you host your websites within a semi-dedicated server account from our firm, all the content you upload will be kept on SSD drives which work in RAID-Z. With this kind of RAID, at least 1 of the hard drives is employed for parity - when data is synchronized between the drives, an extra bit is added to it on the parity one. The reasoning behind this is to ensure the integrity of the information which is cloned to a brand new drive in the event that one of the hard drives in the RAID fails as the website 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 that even if a disk drive fails, the system can easily switch to another one immediately 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 together with the ZFS file system that uses unique checksums to verify the integrity of each file.
RAID in VPS Servers
All VPS server accounts that our company provides are created on physical servers which use SSD drives functioning in RAID. At least 1 drive is employed for parity - one additional bit is added to the information duplicated on it and in case a main disk fails, this bit makes it simpler to recalculate the bits of the files on the failed disk drive so that the accurate information is restored on the new drive added to the RAID. Meanwhile, your sites will remain online since all the info will still load from at least one other disk drive. In the event that you add routine backups to your VPS plan, a copy of the data will be kept on standard hard disks which also operate in RAID since we would like to make certain that any type of site content you add will be protected all of the time. Employing multiple hard disks in RAID for all the main and backup servers allows us to offer fast and reliable hosting service.