RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that enables a system to use several hard drives as one single logical unit. Simply put, all drives are used as one and the information on all of them is identical. Such a configuration has two key advantages over using a single drive to save data - the first one is redundancy, so in case one drive fails, the information will be accessed through the remaining ones, and the second is better performance because the input/output, or reading/writing operations will be spread among different drives. There are different RAID types depending on the number of drives are used, whether reading and writing are both executed from all drives concurrently, if data is written in blocks on one drive after another or is mirrored between drives in the same time, etcetera. Depending on the exact setup, the error tolerance and the performance may vary.

RAID in Hosting

All the content which you upload to your new hosting account will be placed on fast SSD drives which work in RAID-Z. This setup is built to employ the ZFS file system that runs on our cloud Internet hosting platform and it adds another level of security for your website content on top of the real-time checksum verification that ZFS uses to ensure the integrity of the data. With RAID-Z, the information is saved on a couple of disks and at least one is a parity disk - whenever information is written on it, an additional bit is added, so in case any drive fails for whatever reason, the integrity of the data can be verified by recalculating its bits in accordance with what is kept on the production hard drives and on the parity one. With RAID-Z, the operation of our system will never be interrupted and it will continue operating efficiently until the malfunctioning drive is replaced and the information is synced on it.

RAID in Semi-dedicated Hosting

The info uploaded to any semi-dedicated hosting account is stored on SSD drives which work in RAID-Z. One of the drives in this kind of a setup is used for parity - every time data is cloned on it, an additional bit is added. If a disk turns out to be faulty, it will be removed from the RAID without disturbing the work of the websites as the data will load from the remaining drives, and when a new drive is added, the information which will be copied on it will be a combination between the data on the parity disk and data saved on the other hard disks in the RAID. That is done so as to ensure that the info that is being copied is correct, so as soon as the new drive is rebuilt, it can be incorporated into the RAID as a production one. This is an extra guarantee for the integrity of your info as the ZFS file system that runs on our cloud hosting platform analyzes a special checksum of all the copies of your files on the various drives to avoid any chance of silent data corruption.

RAID in VPS Web Hosting

The SSD drives that we use on the physical machines where we set up virtual private servers work in RAID to ensure that any content you upload will be available and intact all the time. At least 1 drive is used for parity - one bit of data is added to any data cloned on it. In the event that a main drive stops working, it is changed and the info that will be copied on it is calculated between the other drives and the parity one. It's done this way to ensure that the correct info is copied and that no file is corrupted since the new drive will be included in the RAID afterwards. Also, we use hard disks working in RAID on the backup servers, so in the event that you add this upgrade to your VPS plan, you will use an even more reliable hosting service as your content will be available on multiple drives regardless of any sort of unexpected hardware malfunction.