In the most general sense what is an array and what is a group (also what's a virtual drive)? From here:
Redundant array of independent disks (RAID) is a storage technology used to improve the processing capability of storage systems. This technology is designed to provide reliability in disk array systems and to take advantage of the performance gains offered by an array of multiple disks over single-disk storage.
This makes it sound like an array can exist without RAID. When configuring RAID in webbios (in LSI MegaRAID) it uses the word group, what does that mean? In this context it seems to mean any disks that aren't part of an array but will be in the future.
Since a system can have more than one independent raid configurations, what would that be called? For example if a system had two harddrives in RAID 0 and another 2 harddrives in RAID one, would the system be said to have two RAID arrays?