RAID, or Redundant Array of Independent Disks, is a technology for storing data on a number hard drives which function together as one logical unit. The drives could be physical or logical i.e. in the aforementioned case one single drive is divided into independent ones via virtualization software. Either way, exactly the same info is saved on all of the drives and the basic advantage of employing 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 overall performance because the input and output operations will be spread among a couple of drives. There are several kinds of RAID dependant upon how many hard disks are used, whether writing is performed on all of the drives in real time or just on one, and how the information is synchronized between the drives - whether it's recorded in blocks on one drive after another or all of it is mirrored from one on the others. These factors show that the fault tolerance as well as the performance between the various RAID types can vary.
RAID in Cloud Web Hosting
The SSD drives that our cutting-edge cloud Internet hosting platform employs for storage function in RAID-Z. This sort of RAID is developed to work with the ZFS file system that runs on the platform and it uses the so-called parity disk - a special drive where information saved on the other drives is duplicated with an extra bit added to it. In the event that one of the disks fails, your sites will continue working from the other ones and after we replace the malfunctioning one, the info that will be copied on it will be recovered from what is stored on the remaining drives along with the information from the parity disk. This is done in order to be able to recalculate the bits of every file properly and to validate the integrity of the info copied on the new drive. This is an additional level of security for the info you upload to your cloud web hosting account along with the ZFS file system that analyzes a unique digital fingerprint for each and every file on all of the drives in real time.
RAID in Semi-dedicated Servers
The SSD drives which are used for storing any website content uploaded to the semi-dedicated server accounts that we provide function in RAID-Z. This is a specific setup where one or more drives are used for parity i.e. the system will include an extra bit to any data duplicated on this type of a hard drive. If a disk fails and is substituted with a new one, what info will be cloned on the latter shall be a mix calculated between the data on the other hard disks and that on the parity one. This is done to ensure that the information on the new drive will be accurate. Throughout the process, the RAID will continue operating normally and the faulty drive will not have an impact on the proper operation of your sites at all. Using SSDs in RAID-Z is a fantastic addition to the ZFS file system that runs on our cutting-edge cloud platform in terms of preserving the integrity of your files as ZFS uses unique digital identifiers identified as checksums in order to avoid silent data corruption.
RAID in VPS Servers
The SSD drives which we use on the physical machines where we create VPS servers work in RAID to make sure that any content which you upload will be available and intact all of the time. At least a single drive is used for parity - one bit of info is added to any data cloned on it. If a main drive stops working, it is replaced and the data that will be copied on it is calculated between the other drives and the parity one. This is done to ensure that the required information is copied and that no file is corrupted since the new drive will be included in the RAID afterwards. In addition, we use hard disk drives functioning in RAID on the backup servers, so in the event that you add this upgrade to your VPS package, you shall use an even more reliable Internet hosting service since your content will be available on multiple drives regardless of any kind of sudden hardware malfunction.