RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which permits a system to use 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 is redundancy, so in the event that one drive doesn't work, the data will be accessed from the others, and the second is improved performance since the input/output, or reading/writing operations will be distributed among several drives. You can find different RAID types depending on the number of drives are used, if reading and writing are both done from all the drives at the same time, if data is written in blocks on one drive after another or is mirrored between drives in the same time, and many others. Depending on the particular setup, the error tolerance and the performance could differ.
RAID in Website Hosting
The SSD drives which our cutting-edge cloud Internet hosting platform employs for storage function in RAID-Z. This type of RAID is intended to work with the ZFS file system that runs on the platform and it takes advantage of the so-called parity disk - a specific drive where info located on the other drives is duplicated with an additional bit added to it. In case one of the disks fails, your sites will continue working from the other ones and after we replace the bad one, the data which will be copied on it will be rebuilt from what is stored on the remaining drives along with the info from the parity disk. This is performed in order to be able to recalculate the bits of every file properly and to confirm the integrity of the info copied on the new drive. This is an additional level of security for the information you upload to your website hosting account along with the ZFS file system that analyzes a special digital fingerprint for each file on all drives in real time.
RAID in Semi-dedicated Servers
If you host your Internet sites within a semi-dedicated server account from our company, all of the content you upload will be saved on SSD drives which work in RAID-Z. With this kind of RAID, at least 1 of the drives is used for parity - when data is synchronized between the disks, an additional bit is added to it on the parity one. The idea behind this is to guarantee the integrity of the info which is copied to a brand new drive in case one of the drives in the RAID breaks down because the site content being copied on the new disk is recalculated from the info on the standard disk drives and on the parity one. Another advantage of RAID-Z is the fact that even if a hard drive stops functioning, the system could switch to another one instantly without service disruptions of any sort. RAID-Z adds an extra level of safety for the content you upload on our cloud web hosting platform along with the ZFS file system which uses unique checksums so as to authenticate the integrity of every single file.
RAID in VPS Servers
The physical servers where we create VPS server employ high-speed SSD drives that will raise the speed of your sites noticeably. The hard drives function in RAID to make sure that you will not lose any info because of a power loss or a hardware breakdown. The production servers employ multiple drives where the info is stored and one disk is used for parity i.e. one bit is added to all data copied on it, that makes it much easier to recover the content without loss in case a main drive breaks down. If you take advantage of our backup service, your data will be stored on an independent machine which uses standard hard-disk drives and 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 content all the time. With this particular setup your data will always be safe since it will be available on many disk drives.