Redundant Array of Independent Disks, or RAID, is a way of saving content on a number of hard disks concurrently. A RAID can be software or hardware based on the HDDs that are used - physical or logical ones, yet what’s common between them is that they all work as just one single unit where info is stored. The top advantage of using a RAID is redundancy because the information on all drives shall be the same all of the time, so even if a drive fails for some reason, the info will still be available on the other drives. The overall performance will also improve since the reading and writing processes can be split between a number of drives, so a single one will never be overloaded. There're different sorts of RAIDs where the effectiveness and fault tolerance may vary based on the specific setup - whether info is written on all drives real-time or it's written on one drive and then mirrored on another, what number of drives are used for the RAID, etc.
RAID in Hosting
The SSD drives that our cutting-edge cloud hosting platform employs for storage work in RAID-Z. This sort of RAID is designed to work with the ZFS file system which runs on the platform and it works by using the so-called parity disk - a special drive where data saved on the other drives is cloned with an additional bit added to it. If one of the disks fails, your websites will continue working from the other ones and after we replace the problematic one, the information that will be copied on it will be rebuilt from what is stored on the other drives along with the data from the parity disk. This is done in order to be able to recalculate the elements of every file adequately and to verify the integrity of the info cloned on the new drive. This is an additional level of security for the content that you upload to your hosting account along with the ZFS file system that compares a unique digital fingerprint for each and every file on all drives in real time.
RAID in Semi-dedicated Servers
If you host your Internet sites in a semi-dedicated server account from our company, any content you upload will be kept on SSD drives that work in RAID-Z. With this form of RAID, at least one of the drives is used for parity - when data is synchronized between the drives, an extra bit is included in it on the parity one. The purpose behind this is to ensure the integrity of the data which is duplicated to a new drive in case one of the drives in the RAID fails as the website content being copied on the new disk is recalculated from the data on the standard drives and on the parity one. An additional advantage of RAID-Z is the fact that even if a drive stops functioning, the system can easily switch to another one right away without service disturbances of any type. RAID-Z adds an extra level of security for the content which you upload on our cloud hosting platform in addition to the ZFS file system which uses unique checksums so as to validate the integrity of every single file.
RAID in VPS Servers
All VPS server accounts which we provide are made on physical servers which employ SSD drives working in RAID. At least one drive is intended for parity - one extra bit is included in the information cloned on it and if a main disk breaks down, this bit makes it simpler to recalculate the bits of the files on the damaged hard disk so that the right data is recovered on the new drive included in the RAID. At the same time, your websites will stay online as all the data will still load from at least one more hard drive. If you add routine backups to your VPS plan, a copy of the information will be kept on standard hard disks which also function in RAID since we would like to make sure that any sort of website content you upload will be risk-free all the time. Employing multiple hard disks in RAID for all main and backup servers permits us to offer fast and reliable Internet hosting service.