RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which enables a system to employ multiple hard drives as a single logical unit. Simply put, all of the drives are used as one and the info on all of them is identical. Such a setup has two major advantages over using just a single drive to keep data - the first one is redundancy, so in case one drive stops working, the information will be accessed through the remaining ones, and the second one is improved performance since the input/output, or reading/writing operations will be distributed among different drives. You can find different RAID types in accordance with what amount of drives are employed, whether reading and writing are both executed from all 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. Based on the particular setup, the fault tolerance and the performance may vary.
RAID in Hosting
The SSD drives which our cutting-edge cloud hosting platform uses for storage operate in RAID-Z. This sort of RAID is created to work with the ZFS file system which runs on the platform and it uses the so-called parity disk - a specific drive where information stored on the other drives is cloned with an additional bit added to it. In case one of the disks stops working, your websites will continue working from the other ones and once we replace the malfunctioning one, the data which will be duplicated on it will be rebuilt from what is stored on the rest of the drives as well as the data from the parity disk. This is done in order to be able to recalculate the elements of every single file correctly and to authenticate the integrity of the information cloned on the new drive. This is an additional level of security for the info which you upload to your hosting account along with the ZFS file system which compares a special digital fingerprint for each file on all of the disk drives in real time.
RAID in Semi-dedicated Hosting
The SSD drives which are used for keeping any website content uploaded to the semi-dedicated hosting accounts which we provide function in RAID-Z. This is a specific setup where one or more drives are employed for parity i.e. the system will include an additional bit to any data copied on such a hard drive. If a disk fails and is substituted with another one, what data will be duplicated on the latter shall be a mix calculated between the data on the remaining disks and that on the parity one. This is done to ensure that the info on the new drive shall be accurate. Throughout the process, the RAID will continue working adequately and the faulty drive won't have an impact on the proper operation of your websites in any way. Using SSDs in RAID-Z is a fantastic addition to the ZFS file system which runs on our state-of-the-art cloud platform with regard to preserving the integrity of your files because ZFS uses specific digital identifiers referred to as checksums to prevent silent data corruption.
RAID in VPS Web Hosting
The physical servers where we generate virtual private server work with quick SSD drives that will boost the speed of your sites noticeably. The hard disks work in RAID to make sure that you won't lose any data because of a power loss or a hardware failure. The production servers work with many different drives where the data is stored and one disk is used for parity i.e. one bit is added to all of the information copied on it, that makes it easier to restore the website content without any loss if a main drive fails. In case you pick 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 guarantee that we will have a backup of your website content all the time. With this particular configuration your info will always be safe as it will be available on multiple drives.