RAID, or Redundant Array of Independent Disks, is a technology of keeping data on a number hard disks that work together as one single logical unit. The drives could be physical or logical i.e. in the second case one drive is split into different ones through virtualization software. Either way, the same data is stored on all drives and the basic advantage of using this type of a setup is that if a drive stops working, the data will remain available on the remaining ones. Using a RAID also boosts the overall performance as the input and output operations will be spread among a number of drives. There are several types of RAID based on how many drives are used, whether writing is done on all drives in real time or just on 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 of these factors mean that the fault tolerance as well as the performance between the various RAID types can vary.
RAID in Cloud Hosting
The SSD drives that our cutting-edge cloud web 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 works by using the so-called parity disk - a special drive where info saved on the other drives is copied with an additional bit added to it. In case one of the disks fails, your Internet sites shall continue working from the other ones and once we replace the malfunctioning one, the info that will be cloned on it will be rebuilt from what is stored on the other drives together with the data from the parity disk. This is performed in order to be able to recalculate the bits of each and every file adequately and to verify the integrity of the data cloned on the new drive. This is an additional level of security for the content that you upload to your cloud hosting account together with the ZFS file system which compares a special digital fingerprint for each and every file on all the disk drives in real time.
RAID in Semi-dedicated Hosting
The SSD drives which are used for saving any content uploaded to the semi-dedicated hosting accounts that we offer operate in RAID-Z. This is a special configuration where one or more hard drives are employed for parity i.e. the system will add an additional bit to any data cloned on this type of a hard drive. If a disk fails and is replaced with a new one, what information will be cloned on the latter will be a mix calculated between the data on the remaining hard disks and that on the parity one. This is done to ensure that the data on the new drive will be correct. Throughout the procedure, the RAID will continue working adequately and the problematic drive will not affect the proper operation of your sites at all. Working with SSDs in RAID-Z is an impressive addition to the ZFS file system that runs on our advanced cloud platform with respect to preserving the integrity of your files since ZFS uses specific digital identifiers named checksums in order to prevent silent data corruption.
RAID in VPS Web Hosting
If you use one of our virtual private server plans, any content which you upload will be kept on SSD drives that operate in RAID. At least one drive is intended for parity to ensure the integrity of your info. In simple terms, this is a special drive where info is copied with one bit added to it. In case a disk inside the RAID breaks down, your sites will continue working and when a new disk takes the place of the faulty one, the bits of the info that will be cloned on it are calculated using the healthy and the parity drives. By doing this, any chance of corrupting data during the process is averted. We also employ ordinary hard disks which work in RAID for storing backup copies, so in case you add this service to your VPS plan, your website content will be kept on multiple drives and you'll never have to worry about its integrity even in the event of multiple drive failures.