RAID, which is short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which allows a system to use many hard drives as a single logical unit. In other words, all of the drives are used as one and the data on all of them is identical. Such a setup has 2 major advantages over using a single drive to save data - the first is redundancy, so in case one drive breaks down, the information will be accessed from the others, and the second is improved performance because the input/output, or reading/writing operations will be distributed among several drives. There are different RAID types depending on how many drives are used, if reading and writing are both performed from all of the drives concurrently, whether 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 error tolerance and the performance could differ.
RAID in Cloud Hosting
The drives which we employ for storage with our ground-breaking cloud web hosting platform are not the traditional HDDs, but super fast solid-state drives (SSD). They work in RAID-Z - a special setup created for the ZFS file system which we work with. All of the content that you add to your cloud hosting account will be saved on multiple hard disks and at least 1 will be employed as a parity disk. This is a special drive where an additional bit is included to any content copied on it. In the event that a disk in the RAID fails, it'll be changed with no service interruptions and the info will be recovered on the new drive by recalculating its bits using the data on the parity disk plus that on the other disks. This is done to ensure the integrity of the information and together with the real-time checksum verification that the ZFS file system runs on all drives, you won't ever have to concern yourself with the loss of any info no matter what.
RAID in Semi-dedicated Hosting
The RAID type which we use for the cloud hosting platform where your semi-dedicated hosting account will be created is known as RAID-Z. What's different about it is that at least one of the disks is used as a parity drive. Put simply, whenever any kind of data is duplicated on this particular disk drive, one more bit is included to it and in the event that a malfunctioning disk is changed, the info that will be cloned on it is a combination of the data on the remaining drives in the RAID and that on the parity one. It's done this way to guarantee that your information is intact. During this process, your Internet sites will be functioning normally because RAID-Z enables a whole drive to fail without any service disruptions and it simply works by using one of the other ones as the main production drive. Using RAID-Z together with the ZFS file system which 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 Hosting
The physical servers where we generate virtual private server use extremely fast SSD drives which will raise the speed of your sites substantially. The disk drives work in RAID to guarantee that you will not lose any data as a result of a power loss or a hardware malfunction. The production servers take advantage of many different drives where the information is stored and one disk is used for parity i.e. one bit is added to all data copied on it, which makes it much easier to recover the website content without loss in case a main drive breaks down. In case you pick our backup service, your information will be kept on a separate 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 ensure that we will have a backup copy of your website content all the time. With this configuration your information will always be safe because it will be available on many drives.