Architecture Overview
ASM creates extents out of datafiles, log-files, system files, control files and other database structures. The system then spreads these extents across all disks in a "diskgroup". One can think of a diskgroup in ASM as an LVM volume group — with an ASM file corresponding to a logical volume. In addition to the existing Oracle background processes, ASM introduces two new ones - OSMB and RBAL. RBAL opens and creates disks in a diskgroup. OSMB provides the functionality of moving data between disks in a diskgroup.
Read more about this topic: Automatic Storage Management
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