RAID, which is short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which makes it possible for a system to take advantage of a number of hard drives as one single logical unit. In other words, all drives are used as one and the info on all of them is the same. Such a setup has two huge advantages over using just a single drive to save data - the first is redundancy, so in case one drive fails, the info will be accessible through the others, and the second is better performance because the input/output, or reading/writing operations will be spread among a number of drives. There are different RAID types depending on the number of drives are used, if reading and writing are both done from all the 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 so on. Depending on the exact setup, the error tolerance and the performance vary.

RAID in Shared Web Hosting

All of the content that you upload to your new shared web hosting account will be saved on fast SSD drives that function in RAID-Z. This setup is built to employ the ZFS file system which runs on our cloud web hosting platform and it adds another level of security for your content in addition to the real-time checksum verification which ZFS uses to ensure the integrity of the data. With RAID-Z, the info is saved on a couple of disks and at least one is a parity disk - whenever data is recorded on it, an additional bit is added, so if any drive stops functioning for some reason, the integrity of the data can be verified by recalculating its bits based on what is saved on the production drives and on the parity one. With RAID-Z, the operation of our system will never be interrupted and it'll continue working smoothly until the faulty drive is replaced and the data is synchronized on it.

RAID in VPS Servers

The SSD drives that we use on the physical machines where we set up VPS servers work in RAID to make sure that any content which you upload will be available and intact all of the time. At least a single drive is used for parity - one bit of information is added to any data cloned on it. In the event that a main drive breaks down, it is replaced and the data that will be duplicated on it is calculated between the other drives and the parity one. That’s done to ensure that the required information is copied and that no file is corrupted because the new drive will be incorporated into the RAID afterwards. In addition, we use hard drives functioning 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 because your content will be available on multiple drives irrespective of any type of unforeseen hardware failure.