RAID, or Redundant Array of Independent Disks, is a technology for keeping data on multiple hard disk drives that function together as one logical unit. The drives could be physical or logical i.e. in the latter case a single drive is divided into individual ones via virtualization software. Either way, the same data is kept on all drives and the main advantage of using this kind of a setup is that in case a drive stops working, the data shall still be available on the other ones. Using a RAID also boosts the overall performance as the input and output operations will be spread among a couple of drives. There are several kinds of RAID depending on how many hard disks are used, whether writing is performed on all drives in real time or just on a single one, and how the data is synchronized between the drives - whether it is written in blocks on one drive after another or all of it is mirrored from one on the others. All these factors show that the error tolerance and the performance between the various RAID types may vary.
RAID in Shared Web Hosting
The SSD drives which our cutting-edge cloud Internet hosting platform uses for storage function in RAID-Z. This type of RAID is designed to work with the ZFS file system which runs on the platform and it employs the so-called parity disk - a specific drive where information kept on the other drives is copied with an additional bit added to it. If one of the disks fails, your Internet sites shall continue working from the other ones and as soon as we replace the problematic one, the information that will be cloned on it will be recovered from what is stored on the rest of the drives together with the information from the parity disk. This is performed in order to be able to recalculate the bits of every single file properly and to validate the integrity of the data duplicated on the new drive. This is an additional level of security for the info that you upload to your shared web hosting account along with the ZFS file system that analyzes a unique digital fingerprint for each file on all the drives in real time.
RAID in Semi-dedicated Servers
The SSD drives which are used for storing any content uploaded to the semi-dedicated server accounts which we provide work in RAID-Z. This is a specific configuration where one or more hard drives are employed for parity i.e. the system will include an additional bit to any data duplicated on this type of a hard drive. If a disk fails and is substituted with another one, what info will be copied on the latter shall be a combination calculated between the data on the remaining drives and that on the parity one. This is done to make sure that the info on the new drive shall be correct. Throughout the process, the RAID will continue functioning adequately and the malfunctioning drive won't have an effect on the normal operation of your sites at all. Using SSDs in RAID-Z is an amazing addition to the ZFS file system that runs on our cutting-edge cloud platform with respect to preserving the integrity of your files because ZFS uses specific digital identifiers named checksums in order to prevent silent data corruption.
RAID in VPS Servers
All VPS server accounts that we provide are made on physical servers which take advantage of SSD drives functioning in RAID. At least 1 drive is employed for parity - one additional bit is included in the data duplicated on it and in case a main disk breaks down, this bit makes it much easier to recalculate the bits of the files on the damaged drive so that the accurate information is restored on the new drive included in the RAID. Meanwhile, your websites will stay online as all the info will still load from at least 1 more hard disk. In the event that you add regular backups to your VPS package, a copy of the data will be saved on standard hard drives which also operate in RAID as we want to make sure that any kind of website content you add will be risk-free at all times. Working with multiple drives in RAID for all of the main and backup servers permits us to offer fast and reliable web hosting service.