RAID, which stands short for Redundant Array of Independent Disks, is a software or hardware storage virtualization technology which enables a system to employ a number of hard drives as one single logical unit. Put simply, all the drives are used as one and the info on all of them is the same. This type of a configuration has two huge advantages over using a single drive to store data - the first one is redundancy, so in the event that one drive breaks down, the data will be accessible through the remaining ones, and the second one is better performance because the input/output, or reading/writing operations will be spread among a number of drives. There're different RAID types based on the number of drives are employed, if reading and writing are both performed from all of the drives concurrently, whether data is written in blocks on one drive after another or is mirrored between drives in the same time, and many others. Based on the particular setup, the fault tolerance and the performance could differ.
RAID in Cloud Hosting
The disk drives which we employ for storage with our state-of-the-art cloud hosting platform are not the standard HDDs, but fast solid-state drives (SSD). They operate in RAID-Z - a special setup developed for the ZFS file system that we employ. All the content that you add to the cloud hosting account will be saved on multiple disk drives and at least 1 shall be used as a parity disk. This is a specific drive where a further bit is added to any content copied on it. In case a disk in the RAID stops functioning, it will be replaced without any service disturbances and the information will be recovered on the new drive by recalculating its bits thanks to the data on the parity disk along with that on the remaining disks. This is done to ensure the integrity of the information and along with the real-time checksum authentication that the ZFS file system performs on all drives, you'll never need to be concerned about losing any info no matter what.
RAID in Semi-dedicated Hosting
The SSD drives which are used for storing any website content uploaded to the semi-dedicated hosting accounts that we offer function in RAID-Z. This is a special configuration where one or more drives are used for parity i.e. the system will add an additional bit to any data copied on this type of a drive. If a disk fails and is replaced with another one, what info will be duplicated on the latter will be a combination calculated between the data on the remaining disks and that on the parity one. This is done to guarantee that the information on the new drive will be accurate. During the process, the RAID will continue working adequately and the problematic drive won't affect the normal operation of your sites in any way. Using SSDs in RAID-Z is an amazing addition to the ZFS file system which runs on our cutting-edge cloud platform with respect to preserving the integrity of your files because ZFS uses specific digital identifiers known as checksums so as to avoid silent data corruption.