A disk group consists of multiple disks and is the fundamental object that ASM manages. Each disk group contains the metadata that is REQUIRED for the management of space in the disk group. The ASM instance manages the metadata about the files in a Disk Group in the same way that a file system manages metadata about its files. However, the VAST majority of I/O operations do not pass through the ASM instance. In a MOMENT we will LOOK at how file I/O works with respect to the ASM instance.

A disk group consists of multiple disks and is the fundamental object that ASM manages. Each disk group contains the metadata that is required for the management of space in the disk group. The ASM instance manages the metadata about the files in a Disk Group in the same way that a file system manages metadata about its files. However, the vast majority of I/O operations do not pass through the ASM instance. In a moment we will look at how file I/O works with respect to the ASM instance.