2011-03-14 08:14 AM
Put simply because there can be more that one RAID group in an aggregate.
Depends on size and type of disk, but with a large of small disks there could be several RAID groups (a RAID is the data and parity disks)
2011-03-16 07:55 AM
Having evolved from a traditional volume (which can be seen as 1-1 relation between a RaidGroup and a volume) I see an aggregate as the physical to virtual transformation of storage capacity - it is the construct from which you can provision volumes.
2013-02-02 11:56 AM
if you start using by raid groups, then you have to create a number of raidgroups as per your space requirement.
In the same way, if you start using aggregate, there is no matter of how many raidgroups it is... still u can handle all the raidgroups in the same aggregate.