RAID, or Redundant Array of Independent Disks, is a technology for keeping data on several hard drives which work together as one single logical unit. The drives could be physical or logical i.e. in the latter case a single drive is divided into different ones using virtualization software. Either way, the same info is saved on all of the drives and the basic benefit of employing this type of a setup is that in case a drive fails, the data will remain available on the remaining ones. Employing a RAID also improves the performance as the input and output operations will be spread among several drives. There are several kinds of RAID depending on how many hard disks are used, whether writing is performed on all the drives in real time or just on a single one, and how the info is synchronized between the drives - whether it's written in blocks on one drive after another or it is mirrored from one on the others. These factors mean that the error tolerance as well as the performance between the different RAID types can vary.
RAID in Cloud Hosting
All of the content that you upload to your new cloud hosting account will be held on quick SSD drives which operate in RAID-Z. This configuration is built to employ the ZFS file system which runs on our cloud hosting platform and it adds one more level of security for your website content on top of the real-time checksum verification that ZFS uses to ensure the integrity of the data. With RAID-Z, the info is saved on a number of disks and at least 1 is a parity disk - whenever information is written on it, an additional bit is added, so in case any drive fails for some reason, the integrity of the data can be verified by recalculating its bits based on what is saved on the production hard disks and on the parity one. With RAID-Z, the operation of our system will never be interrupted and it will continue working effectively until the malfunctioning drive is replaced and the info is synced on it.
RAID in Semi-dedicated Hosting
The SSD drives which are used for keeping any website content uploaded to the semi-dedicated hosting accounts that we offer function in RAID-Z. This is a specific setup where one or more disk drives are employed for parity i.e. the system will include an additional bit to any data duplicated on this type of a disk drive. In case that a disk fails and is replaced with a new one, what info will be copied on the latter will be a combination calculated between the data on the other drives and that on the parity one. This is done to guarantee that the information on the new drive will be correct. Throughout the process, the RAID will continue working adequately and the faulty drive won't impact the proper operation of your websites in any respect. Working with SSDs in RAID-Z is an excellent addition to the ZFS file system which runs on our advanced cloud platform in terms of preserving the integrity of your files because ZFS uses unique digital identifiers named checksums in order to prevent silent data corruption.
All virtual private server accounts that our company provides are created on physical servers which take advantage of SSD drives working in RAID. At least one drive is used for parity - one additional bit is included in the data duplicated on it and in case a main disk stops working, this bit makes it much simpler to recalculate the bits of the files on the failed hard disk so that the correct info is recovered on the new drive included in the RAID. At the same time, your sites will still be online because all the data will still load from at least 1 more drive. In the event that you add routine backups to your VPS package, a copy of your data will be saved on standard hard disks which also function in RAID as we want to make sure that any kind of site content you upload will be protected all of the time. Working with multiple hard drives in RAID for all main and backup servers permits us to offer fast and reliable web hosting service.