RAID, which stands short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that enables a system to employ multiple hard drives as one single logical unit. Simply put, all the drives are used as one and the info on all of them is identical. Such a configuration has 2 key advantages over using just a single drive to save data - the first is redundancy, so if one drive fails, the data will be accessed from the remaining ones, and the second one is improved performance because the input/output, or reading/writing operations will be distributed among multiple drives. There are different RAID types depending on what number of drives are employed, whether reading and writing are both performed 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, etc. Based on the particular setup, the fault tolerance and the performance vary.
RAID in Web Hosting
All of the content which you upload to your new web hosting account will be placed on quick SSD drives which work in RAID-Z. This setup is built to employ the ZFS file system which runs on our cloud web hosting platform and it adds one more level of security for your website content on top of the real-time checksum validation which ZFS uses to ensure the integrity of the data. With RAID-Z, the data is stored on several disks and at least one is a parity disk - whenever data is recorded on it, an extra bit is added, so if any drive fails for some reason, the integrity of the information can be verified by recalculating its bits in accordance with what is stored on the production disks and on the parity one. With RAID-Z, the functioning of our system won't be interrupted and it will continue operating effectively until the malfunctioning drive is changed and the data is synced on it.
RAID in Semi-dedicated Servers
The RAID type which we use for the cloud hosting platform where your semi-dedicated server account will be created is referred to as RAID-Z. What's different about it is that at least 1 of the disks is used as a parity drive. In simple terms, whenever any data is copied on this special drive, one more bit is added to it and in case a problematic disk is replaced, the information which will be cloned on it is a combination of the data on the remaining disk drives in the RAID and that on the parity one. We do this to guarantee that the data is intact. During this process, your Internet sites will be functioning normally because RAID-Z makes it possible for a whole drive to fail without causing any service interruptions and it simply uses one of the other ones as the main production drive. Using RAID-Z together with the ZFS file system that uses checksums to warrant that no data will get silently corrupted on our servers, you will not need to worry about the integrity of your files.
RAID in VPS Servers
If you use one of our VPS server packages, any content you upload will be kept on SSD drives that work in RAID. At least one drive is intended for parity so as to ensure the integrity of the information. In simple terms, this is a special drive where info is copied with one bit added to it. If a disk in the RAID breaks down, your websites will continue working and when a new disk replaces the malfunctioning one, the bits of the data that will be copied on it are calculated by using the healthy and the parity drives. By doing this, any chance of corrupting data throughout the process is averted. We also employ conventional hard disks that function in RAID for storing backup copies, so should you include this service to your VPS package, your website content will be stored on multiple drives and you won't ever have to worry about its integrity even in the event of multiple drive failures.