RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology that makes it possible for a system to employ many hard drives as one single logical unit. Put simply, all drives are used as one and the information on all of them is the same. This type of a configuration has 2 huge advantages over using a single drive to keep data - the first is redundancy, so if one drive breaks down, the data will be accessible from the remaining ones, and the second is better performance as the input/output, or reading/writing operations will be spread among different drives. You can find different RAID types in accordance with what amount of drives are employed, if reading and writing are both done from all the drives at the same time, whether 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 fault tolerance and the performance may vary.
RAID in Shared Hosting
All of the content which you upload to your new shared hosting account will be held on quick SSD drives that operate in RAID-Z. This setup is built to use the ZFS file system that runs on our cloud Internet hosting platform and it adds one more level of security for your content on top of the real-time checksum verification which ZFS uses to guarantee the integrity of the data. With RAID-Z, the info is saved on a couple of disks and at least one of them is a parity disk - whenever information is written on it, an additional bit is added, so in case any drive stops working for some reason, the stability of the data can be verified by recalculating its bits in accordance with what is stored on the production hard disks and on the parity one. With RAID-Z, the functioning of our system won't be interrupted and it'll continue operating efficiently until the problematic drive is replaced and the information is synced on it.
RAID in Semi-dedicated Hosting
The RAID type that we use for the cloud hosting platform where your semi-dedicated hosting account shall be created is known 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 specific hard drive, one more bit is added to it and in case a defective disk is changed, the data which will be copied on it is a combination of the data on the other drives in the RAID and that on the parity one. This is done to ensure that your info is intact. During this process, your websites will be working normally since RAID-Z enables an entire drive to fail without service disruptions and it simply uses one of the other ones as the main production drive. Employing RAID-Z together with the ZFS file system that uses checksums to warrant that no data shall get silently corrupted on our servers, you will not need to worry about the integrity of your files.
RAID in VPS
The physical servers where we make virtual private server employ extremely fast SSD drives that will increase the speed of your Internet sites substantially. The drives operate in RAID to guarantee that you won't lose any information because of a power loss or a hardware malfunction. The production servers use a variety of drives where the information is kept and one disk is used for parity i.e. one bit is added to all info copied on it, which makes it much easier to restore the website content without any loss if a main drive breaks down. If you take advantage of our backup service, the info will be kept on an independent machine which uses standard hard-disk drives and although there isn't a parity one in this case, they are also in a RAID to guarantee that we will have a backup of your content at all times. With this particular setup your info will always be safe because it will be available on multiple drives.