Disks

Disks statistics provide the allocated and unallocated storage for all the disks and disk partitions on a host. All disks are listed including virtual disks from external storage systems such as EMC Storage Array.

Note: Overhead information for virtual disks is not instrumented nor presented.

For a disk to be deployed for usage, the disk must first be formatted. After formatting, the disk can be configured (using vendor-specific configuration utilities) to have one or more partitions.

A disk or disk partition can be associated (using vendor-specific configuration utilities) with exactly one entity from one of the upper layers (volumes, Oracle ASM, databases, and file systems) on the host. When an association exists for a disk or disk partition to an upper layer entity, it is reported as allocated space in Enterprise Manager.