RAID (redundant array of independent disks) is an array of multiple disks that are managed by a controller. RAID is used to increase data storage reliability, as well as to boost read and write speed. The most popular type is RAID1 (mirrored array). It provides an acceptable write speed and increased read speed for parallel requests. It is highly reliable. It keeps functioning as long as there is at least one fully-operational disk in the array. The probability that two disks will fall out of order at once is very low.
Our dedicated servers use a programmatic RAID1 array by default. A hardware RAID array (controller) can be installed for an additional fee. To set up a RAID array, it is necessary to order disks by pairs. The total amount of storage space is equal to that of the smallest disk in the array.