RAID, which is an acronym of Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which enables a system to use a number of hard drives as a single logical unit. Put simply, all drives are used as one and the data on all of them is the same. Such a configuration has two major advantages over using just a single drive to save data - the first is redundancy, so in the event that one drive stops working, the data will be accessed through the others, and the second is better performance since the input/output, or reading/writing operations will be distributed among several drives. There're different RAID types depending on what amount of drives are used, if reading and writing are both handled from all of the drives concurrently, if data is written in blocks on one drive after another or is mirrored between drives in the same time, and so on. According to the particular setup, the fault tolerance and the performance may vary.
RAID in Cloud Website Hosting
The hard disks which we employ for storage with our innovative cloud web hosting platform are not the classic HDDs, but fast solid-state drives (SSD). They work in RAID-Z - a special setup developed for the ZFS file system that we use. All of the content that you add to the cloud website hosting account will be stored on multiple disk drives and at least one will be employed as a parity disk. This is a special drive where a further bit is included to any content copied on it. In the event that a disk in the RAID stops functioning, it'll be replaced without 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 so as to ensure the integrity of the info and along with the real-time checksum verification that the ZFS file system executes on all drives, you won't ever have to concern yourself with losing any information no matter what.
RAID in Semi-dedicated Servers
The SSD drives that are used for storing any website content uploaded to the semi-dedicated server accounts which we offer work in RAID-Z. This is a specific configuration where one or more drives are employed for parity i.e. the system will add an additional bit to any data copied on this kind of a drive. In case that a disk fails and is replaced with a new one, what information will be copied 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 information on the new drive shall be accurate. During the process, the RAID will continue working normally and the problematic drive will not impact the proper operation of your websites in any respect. Working with SSDs in RAID-Z is an outstanding 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 unique digital identifiers referred to as checksums to prevent silent data corruption.
RAID in VPS Servers
In case you use one of our VPS server packages, any content you upload will be kept on SSD drives that function in RAID. At least one drive is intended for parity so as to guarantee the integrity of the information. In simple terms, this is a special drive where info is copied with one bit added to it. If a disk in the RAID stops functioning, your websites will continue working and when a new disk replaces the faulty one, the bits of the data that will be duplicated on it are calculated using the healthy and the parity drives. That way, any potential for corrupting data throughout the process is prevented. We also employ regular hard disk drives that operate in RAID for storing backup copies, so should you add this service to your VPS package, your content will be stored on multiple drives and you'll never need to worry about its integrity even in the event of multiple drive breakdowns.