Redundant Array of Independent Disks, or RAID, is a way of keeping content on multiple hard drives concurrently. A RAID can be software or hardware based on the hard drives that are used - physical or logical ones, but what’s common between them is that they all function as a single unit where your information is stored. The top advantage of employing a RAID is redundancy as the information on all of the drives will be identical all the time, so even in the event that a drive fails for whatever reason, the information will still be present on the rest of the drives. The general performance will also improve because the reading and writing processes could be split between different drives, so a single one can't be overloaded. There are different kinds of RAIDs where the performance and fault tolerance may vary according to the exact setup - whether info is written on all of the drives in real time or it's written on a single drive and after that mirrored on another, the number of drives are used for the RAID, etc.
RAID in Cloud Hosting
All of the content which you upload to your new cloud hosting account will be stored on fast SSD drives which function in RAID-Z. This setup is built to work with the ZFS file system that runs on our cloud hosting platform and it adds an additional level of protection for your website content in addition to the real-time checksum verification which ZFS uses to ensure the integrity of the data. With RAID-Z, the data is saved on several disks and at least one of them is a parity disk - whenever info is recorded on it, an extra bit is added, so in case any drive stops working for some reason, the integrity of the info 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 functioning of our system won't be interrupted and it'll continue operating effectively until the faulty drive is changed and the data is synced on it.
RAID in Semi-dedicated Servers
The RAID type that we use for the cloud hosting platform where your semi-dedicated server account shall be created is referred to as RAID-Z. What is different about it is that at least one of the disks is employed as a parity drive. In simple terms, whenever any kind of data is copied on this special hard drive, one more bit is included to it and in the event that a defective disk is replaced, the data that will be duplicated on it is a combination of the data on the remaining hard disks in the RAID and that on the parity one. It's done this way to ensure that your data is intact. During this process, your sites will be functioning normally because RAID-Z enables a whole drive to fail without service disturbances 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 that uses checksums to ensure that no data will get silently corrupted on our servers, you will not have to worry about the integrity of your files.
RAID in VPS Servers
The physical servers where we make VPS server employ fast SSD drives that will raise the speed of your Internet sites considerably. The hard disks work in RAID to make sure that you will not lose any info due to a power loss or a hardware malfunction. The production servers work with multiple drives where the info is kept and one disk is used for parity i.e. one bit is added to all information copied on it, that makes it easier to recover the content without loss if a main drive breaks down. In case you choose our backup service, the information will be stored on an individual machine which uses standard hard-disk drives and even though there isn't a parity one in this case, they are also in a RAID to make sure that we will have a backup of your content all of the time. With this particular configuration your information will always be safe because it will be available on several drives.