Redundant Array of Independent Disks, or RAID, is a method of saving content on multiple hard disk drives at the same time. A RAID could be software or hardware based on the HDDs that are used - physical or logical ones, yet what’s common between them is that they all function as one single unit where your information is kept. The main advantage of using a RAID is redundancy as the data on all of the drives is the same all the time, so even in case one of the drives fails for whatever reason, the information will still be present on the other drives. The overall performance is enhanced as well as the reading and writing processes will be split between multiple drives, so a single one will never be overloaded. There're different sorts of RAIDs where the performance and fault tolerance may vary depending on the exact setup - whether your data is written on all the drives in real time or it is written on one drive and afterwards mirrored on another, the number of drives are used for the RAID, and many others.
RAID in Shared Hosting
All of the content that you upload to your new shared hosting account will be saved on quick SSD drives which function in RAID-Z. This setup is built to use the ZFS file system which runs on our cloud Internet hosting platform and it adds another level of protection for your website content on top of the real-time checksum verification that ZFS uses to guarantee the integrity of the data. With RAID-Z, the info is stored on several disks and at least 1 is a parity disk - whenever data is written on it, an extra bit is added, so in case any drive stops working for whatever reason, the stability of the information can be verified by recalculating its bits in accordance with what is kept on the production hard disks and on the parity one. With RAID-Z, the operation of our system will never be interrupted and it'll continue operating efficiently until the faulty drive is replaced and the data is synced on it.
RAID in Semi-dedicated Hosting
The SSD drives which are used for holding any content uploaded to the semi-dedicated hosting accounts that we offer operate in RAID-Z. This is a specific setup where one or more disk drives are used for parity i.e. the system will add an additional bit to any data cloned on this kind of a disk drive. If a disk fails and is substituted with another one, what info will be cloned on the latter will be a mix calculated between the data on the remaining drives and that on the parity one. This is done to guarantee that the information on the new drive will be accurate. During the process, the RAID will continue functioning normally and the faulty drive won't have an impact on the adequate operation of your websites by any means. Working with SSDs in RAID-Z is a superb addition to the ZFS file system that runs on our advanced cloud platform with regards to preserving the integrity of your files as ZFS uses special digital identifiers identified as checksums in order to avoid silent data corruption.
The physical servers where we create virtual private server use quick SSD drives which will increase the speed of your Internet sites substantially. The hard disks function in RAID to make sure that you won't lose any information due to a power loss or a hardware breakdown. The production servers work with many different drives where the information is kept and one disk is used for parity i.e. one bit is added to all data copied on it, which makes it easier to restore the website content without loss in case a main drive fails. If you pick our backup service, your data will be saved on an individual machine that uses standard hard-disk drives and even though there isn't a parity one in this case, they are also in a RAID to ensure that we will have a backup of your site content at all times. With this configuration your info will always be safe since it will be available on many disk drives.