RAID, or Redundant Array of Independent Disks, is a technology of keeping data on multiple hard drives which operate together as one logical unit. The drives can be physical or logical i.e. in the second case one single drive is split into individual ones using virtualization software. In any case, the same info is stored on all drives and the main advantage of employing this kind of a setup is that in the event that a drive fails, the data will remain available on the remaining ones. Employing a RAID also enhances the performance as the input and output operations will be spread among a number of drives. There are several types of RAID depending on how many hard disks are used, whether writing is done on all of the drives in real time or just on one, and how the data is synced between the hard drives - whether it's recorded in blocks on one drive after another or it is mirrored from one on the others. These factors show that the fault tolerance as well as the performance between the different RAID types may vary.
RAID in Shared Website Hosting
The disk drives that we use for storage with our innovative cloud web hosting platform are not the classic HDDs, but extremely fast solid-state drives (SSD). They function in RAID-Z - a special setup intended for the ZFS file system that we use. All of the content that you add to the shared website hosting account will be held on multiple drives and at least one of them shall be used as a parity disk. This is a special 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 will be changed with no service disturbances and the data will be recovered on the new drive by recalculating its bits thanks to the data on the parity disk plus that on the other disks. This is done so as to guarantee the integrity of the data and together with the real-time checksum authentication which the ZFS file system performs on all drives, you'll never need to concern yourself with losing any info no matter what.
RAID in Semi-dedicated Hosting
The SSD drives which are used for storing any site content uploaded to the semi-dedicated hosting accounts that we provide operate in RAID-Z. This is a special setup where one or more drives are used for parity i.e. the system will include an additional bit to any data duplicated on such a hard drive. In case that a disk fails and is replaced with a new one, what data will be duplicated on the latter shall be a combination calculated between the data on the remaining drives and that on the parity one. This is done to ensure that the info on the new drive will be accurate. During the procedure, the RAID will continue functioning adequately and the malfunctioning drive won't affect the adequate operation of your sites 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 in terms of preserving the integrity of your files because ZFS uses special digital identifiers named checksums so as to prevent silent data corruption.
RAID in VPS Hosting
All virtual private server accounts that we provide are made on physical servers that use SSD drives functioning in RAID. At least 1 drive is employed for parity - one extra bit is added to the information copied on it and if a main disk stops working, this bit makes it easier to recalculate the bits of the files on the damaged drive so that the correct info is restored on the new drive included in the RAID. At the same time, your sites will stay online as all the information will still load from at least one more disk drive. In case you add regular backups to your VPS package, a copy of your data will be stored on standard hard drives that also work in RAID since we want to make sure that any sort of website content you upload will be risk-free all of the time. Working with multiple hard drives in RAID for all the main and backup servers enables us to offer fast and reliable Internet hosting service.