ASM Failure Groups & Redundancy – DG Mirroring – Management (VASM_DISK,VASM_DISKGROUP,VASM_FILE)

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ASM Failure Groups & Redundancy - DG Mirroring - Management (VASM_DISK,VASM_DISKGROUP,VASM_FILE)
ASM Failure Groups & Redundancy – DG Mirroring – Management (VASM_DISK,VASM_DISKGROUP,VASM_FILE)
ASM Failure Groups & Redundancy – DG Mirroring – Management (VASM_DISK,VASM_DISKGROUP,VASM_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
– VASM_DISK
– VASM_DISKGROUP
– VASM_FILE)

#ASM #FailureGroup #DiskGroupMirroring #Redundancy #ASM_DISK #ASM_DISKGROUP #ASM_FILE #RAC #Oracle #Database #Exadata

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