RAID, or Redundant Array of Independent Disks, is a technology of storing data on multiple hard drives that operate together as a single logical unit. The drives can be physical or logical i.e. in the second case a single drive is divided into separate ones via virtualization software. In any case, the very same info is saved on all drives and the key benefit of using this type of a setup is that in the event that a drive breaks down, the data shall still be available on the other ones. Using a RAID also improves the overall performance because the input and output operations will be spread among several drives. There are several types of RAID based on how many drives are used, whether writing is done on all the drives in real time or just on a single one, and how the data is synced between the hard drives - whether it's recorded in blocks on one drive after another or it is mirrored from one on the others. All these factors mean that the fault tolerance as well as the performance between the different RAID types may vary.
RAID in Cloud Hosting
The SSD drives which our cutting-edge cloud Internet hosting platform uses for storage work in RAID-Z. This kind of RAID is intended to work with the ZFS file system that runs on the platform and it works by using the so-called parity disk - a specific drive where information kept on the other drives is copied with an additional bit added to it. In case one of the disks stops functioning, your Internet sites will continue working from the other ones and after we replace the faulty one, the data which will be copied on it will be rebuilt from what is stored on the other drives along with the info from the parity disk. This is performed so as to be able to recalculate the elements of each file correctly and to confirm the integrity of the data duplicated on the new drive. This is another level of security for the info that you upload to your cloud hosting account along with the ZFS file system that compares a unique digital fingerprint for every single file on all of the disk drives in real time.
RAID in Semi-dedicated Hosting
If you host your websites within a semi-dedicated hosting account from our company, all the content you upload will be held on SSD drives that work in RAID-Z. With this form of RAID, at least one of the hard disks is employed for parity - when data is synchronized between the drives, an extra bit is added to it on the parity one. The purpose behind this is to guarantee the integrity of the info which is duplicated to a brand new drive in the event that one of the drives in the RAID fails as the site content being copied on the new disk is recalculated from the information on the standard disk drives and on the parity one. Another advantage of RAID-Z is that even if a drive fails, the system can easily switch to another one right away without service interruptions of any sort. RAID-Z adds one more level of security for the content which you upload on our cloud hosting platform along with the ZFS file system which uses unique checksums as a way to authenticate the integrity of every single file.
RAID in VPS Hosting
The physical servers where we generate virtual private server use high-speed SSD drives which will raise the speed of your sites significantly. The disk drives function in RAID to ensure that you won't lose any info as a result of a power loss or a hardware failure. The production servers take advantage of a variety of drives where the information is saved and one disk is used for parity i.e. one bit is added to all info copied on it, which makes it much easier to recover the site content without any loss in the event a main drive stops working. If you take advantage of our backup service, your info will be stored on a separate machine which uses standard hard-disk drives and even though there is no parity one in this case, they are also in a RAID to guarantee that we will have a backup copy of your site content all of the time. With this kind of configuration your information will always be safe because it will be available on a lot of disk drives.