RAID, or Redundant Array of Independent Disks, is a technology of keeping data on multiple hard disks which operate together as one logical unit. The drives can be physical or logical i.e. in the second case one single drive is split into separate ones through virtualization software. In any case, exactly the same info is stored on all drives and the key benefit of employing this type of a setup is that in the event that a drive breaks down, the data shall still be available on the remaining ones. Using a RAID also improves the overall performance since the input and output operations will be spread among a few drives. There are several types of RAID depending on how many hard drives are used, whether writing is done on all the drives in real time or just on a single one, and how the info 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. These factors imply that the fault tolerance as well as the performance between the various RAID types may vary.

RAID in Hosting

The SSD drives that our cutting-edge cloud Internet hosting platform employs for storage function in RAID-Z. This type of RAID is intended to work with the ZFS file system which runs on the platform and it uses 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 stops working, your websites shall continue working from the other ones and once we replace the bad one, the data which will be duplicated on it will be recovered from what is stored on the other drives together with the data from the parity disk. This is done in order to be able to recalculate the bits of each and every file correctly and to authenticate the integrity of the data cloned on the new drive. This is an additional level of security for the info that you upload to your hosting account along with the ZFS file system that compares a unique digital fingerprint for each file on all of the disk drives in real time.

RAID in Semi-dedicated Servers

The info uploaded to any semi-dedicated server account is kept on SSD drives that function in RAID-Z. One of the drives in this kind of a configuration is used for parity - any time data is cloned on it, an extra bit is added. If a disk turns out to be defective, it will be taken out of the RAID without disturbing the functioning of the Internet sites as the data will load from the other drives, and when a new drive is added, the information that will be duplicated on it will be a blend between the data on the parity disk and data saved on the other drives in the RAID. That is done so as to guarantee that the information which is being copied is accurate, so the moment the new drive is rebuilt, it could be included in the RAID as a production one. This is one more guarantee for the integrity of your data as the ZFS file system that runs on our cloud hosting platform analyzes a special checksum of all of the copies of your files on the different drives in order to avoid any probability of 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 that you upload will be available and intact all of the time. At least one drive is employed for parity - one bit of data is added to any data cloned on it. If a main drive stops working, it is changed and the information which will be duplicated 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 incorporated into the RAID afterwards. We also use hard drives working in RAID on the backup servers, so in case you add this upgrade to your VPS plan, you shall use an even more reliable web hosting service because your content will be available on multiple drives irrespective of any type of sudden hardware failure.