RAID, or Redundant Array of Independent Disks, is a technology for saving data on multiple hard drives that work together as a single logical unit. The drives could be physical or logical i.e. in the second case one single drive is split into separate ones through virtualization software. In either case, the same data is stored on all of the drives and the key advantage of using this kind of a setup is that if a drive breaks down, the data shall still be available on the remaining ones. Having a RAID also enhances the 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 performed on all drives in real time or just on one, and how the information is synced between the hard drives - whether it's written in blocks on one drive after another or all of it is mirrored from one on the others. All these factors suggest that the error tolerance as well as the performance between the different RAID types could differ.

RAID in Cloud Website Hosting

The SSD drives that our cutting-edge cloud hosting platform uses for storage work in RAID-Z. This sort of RAID is designed to work with the ZFS file system that runs on the platform and it uses the so-called parity disk - a specific drive where data stored on the other drives is duplicated with an extra bit added to it. In the event that one of the disks stops functioning, your Internet sites will continue working from the other ones and once we replace the problematic one, the information that will be cloned on it will be recovered from what is stored on the remaining drives as well as the info from the parity disk. This is done so as to be able to recalculate the bits of every file correctly and to authenticate the integrity of the info cloned on the new drive. This is one more level of security for the information that you upload to your cloud website hosting account in addition to the ZFS file system that compares a unique digital fingerprint for each file on all the hard drives in real time.

RAID in Semi-dedicated Servers

The SSD drives that are used for holding any website content uploaded to the semi-dedicated server accounts that we provide function in RAID-Z. This is a specific configuration where one or more hard drives are used for parity i.e. the system will include an extra bit to any data copied on such a hard drive. If a disk fails and is substituted with a new one, what info will be cloned on the latter shall be a mix calculated between the data on the remaining drives and that on the parity one. This is done to guarantee that the info on the new drive will be accurate. During the process, the RAID will continue functioning normally and the faulty drive will not impact the adequate operation of your websites in any respect. Using SSDs in RAID-Z is an amazing addition to the ZFS file system which runs on our state-of-the-art cloud platform in terms of preserving the integrity of your files because ZFS uses specific digital identifiers named checksums so as to prevent silent data corruption.

RAID in VPS Servers

The SSD drives which we use on the physical machines where we set up VPS servers function in RAID to ensure that any content that you upload will be available and intact at all times. At least one drive is used for parity - one bit of data is added to any data copied on it. In case a main drive breaks down, it is changed and the info that will be cloned on it is calculated between the remaining drives and the parity one. That’s done to make sure that the required data is copied and that not a single file is corrupted because the new drive will be incorporated into the RAID afterwards. Also, we use hard disk drives working in RAID on the backup servers, so if you add this upgrade to your VPS plan, you will use an even more reliable hosting service since your content will be available on multiple drives irrespective of any kind of sudden hardware failure.