RAID, or Redundant Array of Independent Disks, is a technology for storing data on multiple hard drives which work together as a single logical unit. The drives could be physical or logical i.e. in the latter case a single drive is divided into different ones through virtualization software. Either way, the same information is kept on all of the drives and the basic benefit of using this type of a setup is that if a drive stops working, the data shall still be available on the remaining ones. Employing a RAID also enhances the performance because the input and output operations will be spread among a number of drives. There are several types of RAID based on how many hard disks are used, whether writing is carried out on all of the drives in real time or just on one, and how the data is synced between the hard drives - whether it's written in blocks on one drive after another or it is mirrored from one on the others. All of these factors imply that the error tolerance and the performance between the different RAID types may differ.
RAID in Web Hosting
The drives which we employ for storage with our outstanding cloud hosting platform are not the classic HDDs, but quick solid-state drives (SSD). They operate in RAID-Z - a special setup intended for the ZFS file system which we employ. All of the content that you upload to your web hosting
account will be stored on multiple disk drives and at least 1 will be used as a parity disk. This is a specific drive where an additional bit is added to any content copied on it. If a disk in the RAID stops working, it will be replaced with no service disturbances and the data will be rebuilt on the new drive by recalculating its bits using the data on the parity disk along with that on the remaining disks. This is done so as to ensure the integrity of the info and along with the real-time checksum verification that the ZFS file system executes on all drives, you'll never need to worry about the loss of any info no matter what.
RAID in Semi-dedicated Servers
If you host your Internet sites within a semi-dedicated server
account from our firm, all the content that you upload will be held on SSD drives that work in RAID-Z. With this kind of RAID, at least one of the disks is employed for parity - when data is synced between the disks, an additional bit is added to it on the parity one. The purpose behind this is to guarantee the integrity of the info which is copied to a brand new drive if one of the disks in the RAID stops functioning because the site content being copied on the brand new disk is recalculated from the information on the standard drives and on the parity one. Another advantage of RAID-Z is the fact that even in the event that a hard drive fails, the system can switch to a different one right away without service disturbances of any type. RAID-Z adds an extra level of protection for the content that you upload on our cloud hosting platform together with the ZFS file system which uses unique checksums as a way to validate the integrity of each file.
RAID in VPS Servers
The SSD drives that we use on the physical machines where we create VPS servers
operate in RAID to make sure that any content you upload will be available and intact all the time. At least 1 drive is used for parity - one bit of data is added to any data copied on it. In the event that a main drive fails, it is replaced and the info that will be copied on it is calculated between the remaining drives and the parity one. It's done this way to make sure that the required data is copied and that no file is corrupted since the new drive will be a part of the RAID afterwards. Also, we use hard drives operating 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 because your content will be available on multiple drives regardless of any sort of unpredicted hardware malfunction.