RAID, which stands short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which enables a system to use a number of hard drives as one single logical unit. To put it differently, all the drives are used as one and the data on all of them is the same. Such a setup has two major advantages over using just a single drive to keep data - the first one is redundancy, so in case one drive breaks down, the info will be accessible from the remaining ones, and the second is better performance because the input/output, or reading/writing operations will be distributed among multiple drives. You can find different RAID types based on how many drives are employed, if reading and writing are both executed from all drives at the same time, if data is written in blocks on one drive after another or is mirrored between drives in the same time, and many others. Based on the particular setup, the fault tolerance and the performance could differ.

RAID in Shared Hosting

All content that you upload to your new shared hosting account will be held on quick SSD drives that function in RAID-Z. This setup is built to employ the ZFS file system that runs on our cloud hosting platform and it adds another level of security for your content on top of the real-time checksum authentication which ZFS uses to guarantee the integrity of the data. With RAID-Z, the information is stored on a number of disks and at least one is a parity disk - whenever data is written on it, an extra bit is added, so in case any drive stops functioning for some reason, the integrity of the data can be verified by recalculating its bits in accordance with what is saved on the production drives and on the parity one. With RAID-Z, the functioning of our system will not be interrupted and it will continue working flawlessly until the malfunctioning drive is replaced and the data is synced on it.

RAID in Semi-dedicated Hosting

The SSD drives that are used for holding any site content uploaded to the semi-dedicated hosting accounts which we offer work in RAID-Z. This is a special setup where one or more hard drives are used for parity i.e. the system will add an extra bit to any data duplicated on such a drive. In case that a disk fails and is substituted with a new one, what info will be duplicated on the latter will be a combination calculated between the data on the remaining hard disks and that on the parity one. This is done to make sure that the data on the new drive will be correct. During the process, the RAID will continue working adequately and the faulty drive won't affect the proper operation of your sites at all. Using SSDs in RAID-Z is an excellent addition to the ZFS file system that runs on our advanced cloud platform with respect to preserving the integrity of your files as ZFS uses unique digital identifiers known as checksums in order to avoid silent data corruption.

RAID in VPS

The SSD drives that we use on the machines where we create virtual private servers operate in RAID to ensure that any content which you upload will be available and intact all the time. At least a single drive is used for parity - one bit of information is added to any data cloned on it. In case a main drive fails, it is replaced and the data that will be copied on it is calculated between the remaining drives and the parity one. That’s done to ensure that the required data is copied and that not a single file is corrupted since the new drive will be incorporated into the RAID afterwards. We also use hard disk drives operating in RAID on the backup servers, so in case you add this upgrade to your VPS package, you will use an even more reliable web hosting service because your content will be available on multiple drives irrespective of any type of unexpected hardware failure.