RAID, or Redundant Array of Independent Disks, is a technology of saving data on a number hard disk drives which work together as one single logical unit. The drives can be physical or logical i.e. in the second case one single drive is divided into individual ones through virtualization software. In any case, identical info is kept on all the drives and the basic benefit of employing this type of a setup is that if a drive fails, the data shall still be available on the other ones. Employing a RAID also boosts the performance as the input and output operations will be spread among a few drives. There are several types of RAID depending on how many hard drives are used, whether writing is done on all the drives in real time or just on a single one, and how the info is synchronized between the drives - whether it's recorded in blocks on one drive after another or it is mirrored from one on the others. These factors indicate that the fault tolerance as well as the performance between the different RAID types may vary.
RAID in Shared Web Hosting
The hard disks which we use for storage with our state-of-the-art cloud Internet hosting platform are not the classic HDDs, but quick solid-state drives (SSD). They work in RAID-Z - a special setup created for the ZFS file system which we use. All the content that you add to the shared web hosting account will be stored on multiple disk drives and at least 1 will be used as a parity disk. This is a specific drive where an additional bit is included to any content copied on it. In the event that a disk in the RAID stops functioning, it'll be changed with no service disruptions and the information will be rebuilt on the new drive by recalculating its bits thanks to the data on the parity disk plus that on the remaining disks. This is done in order to ensure the integrity of the data and together with the real-time checksum validation that the ZFS file system runs on all drives, you'll never have to worry about the loss of any information no matter what.
RAID in Semi-dedicated Servers
If you host your websites in a semi-dedicated server account from our firm, any content you upload will be saved on SSD drives which operate in RAID-Z. With this form of RAID, at least 1 of the drives is employed for parity - when data is synchronized between the drives, 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 cloned to a brand new drive in case one of the disks in the RAID breaks down since the content being copied on the brand new disk is recalculated from the data on the standard hard drives and on the parity one. An additional advantage of RAID-Z is the fact that even if a hard drive stops working, the system could switch to a different one quickly without service disturbances of any sort. RAID-Z adds an extra level of security for the content you upload on our cloud hosting platform in addition to the ZFS file system which uses unique checksums so as to authenticate the integrity of every single file.
RAID in VPS Servers
All VPS server accounts that our company offers are created on physical servers that use SSD drives working in RAID. At least 1 drive is intended for parity - one additional bit is added to the data copied on it and if a main disk fails, this bit makes it much simpler to recalculate the bits of the files on the damaged hard disk so that the accurate data is recovered on the new drive added to the RAID. Meanwhile, your sites will remain online because all the information will still load from at least 1 other hard disk. If you add routine backups to your VPS package, a copy of your data will be saved on standard hard disks that also function in RAID since we would like to make certain that any sort of content you upload will be risk-free all of the time. Using multiple drives in RAID for all the main and backup servers permits us to offer fast and reliable hosting service.