RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which enables a system to take advantage of many hard drives as one single logical unit. Put simply, all the drives are used as one and the info on all of them is the same. This kind of a setup has two major advantages over using a single drive to save data - the first one is redundancy, so in the event that one drive stops working, the info will be accessed from the remaining ones, and the second is improved performance since the input/output, or reading/writing operations will be spread among a number of drives. You can find different RAID types based on the number of drives are used, whether reading and writing are both performed from all the drives concurrently, whether data is written in blocks on one drive after another or is mirrored between drives in the same time, etc. Depending on the exact setup, the fault tolerance and the performance could differ.
RAID in Cloud Hosting
All the content that you upload to your new cloud hosting account will be saved on quick SSD drives which work in RAID-Z. This setup is built to use the ZFS file system which runs on our cloud web hosting platform and it adds an additional level of security for your site content in addition to the real-time checksum authentication that ZFS uses to guarantee the integrity of the data. With RAID-Z, the info is saved on a couple of disks and at least 1 is a parity disk - whenever information is recorded on it, an extra bit is added, so if any drive stops working for whatever 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 not be interrupted and it'll continue operating effectively until the malfunctioning drive is changed and the information is synchronized on it.
RAID in Semi-dedicated Servers
The RAID type that we employ for the cloud hosting platform where your semi-dedicated server account will be created is called RAID-Z. What is different about it is that at least 1 of the disks is employed as a parity drive. In simple terms, whenever any data is cloned on this special hard drive, one more bit is added to it and in the event that a problematic disk is replaced, the data that will be duplicated on it is a mix of the data on the remaining drives in the RAID and that on the parity one. It's done this way to ensure that the data is intact. Throughout this process, your websites will be functioning normally because RAID-Z enables a whole drive to fail without service disruptions and it simply works by using one of the remaining ones as the main production drive. Employing RAID-Z together with the ZFS file system that uses checksums to guarantee that no data shall get silently corrupted on our servers, you won't have to worry about the integrity of your files.
RAID in VPS Servers
The physical servers where we make VPS server employ quick SSD drives which will increase the speed of your websites considerably. The hard drives work in RAID to guarantee that you will not lose any information because of a power loss or a hardware breakdown. The production servers employ many different drives where the data is stored and one disk is used for parity i.e. one bit is added to all information copied on it, which makes it easier to recover the site content without any loss if a main drive fails. In case you use our backup service, your info will be kept on an independent machine that uses standard hard-disk drives and even though there's no parity one in this case, they are also in a RAID to guarantee that we will have a backup of your website content all the time. With this kind of configuration your data will always be safe since it will be available on multiple drives.