ASM Failure Groups & Redundancy - DG Mirroring - Management (V$ASM_DISK,V$ASM_DISKGROUP,V$ASM_FILE)

Failure Group:
Subset of disks in a disk group dependent on a common
hardware resource whose failure must be tolerated

Note:
ASM won‘t do a hardware check when creating failure groups

From this, we get 3 possibilities for creating FG‘s:

(1) create real FG‘s according to definition (independend hardware)
(2) define FG‘s of your own
(3) use DEFAULT: each disk as a separate FG

Mirroring:
EXTERNAL REDUNDANCY indicates that ASM does not provide any redundancy for the disk group.
With NORMAL REDUNDANCY (the default), a disk group can tolerate the loss of a single failure group without data loss.
HIGH REDUNDANCY provides a greater degree of protection (three-way mirroring).

ASM Management
- V$ASM_DISK
- V$ASM_DISKGROUP
- V$ASM_FILE)

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