How do ASM failure groups provide redundancy?

Question

Options

• AFailure groups are created for each grid disk to ensure mirror copies are written to the same
• BFailure groups contain all ASM disks in a single storage server preventing mirror copies being
• CThey ensure that the ASM Flex instances are enabled on a maximum of two database servers or
• DExtended Redundancy mirrors data across data centers providing the highest levels of data

• B
  94% (34)
• C
  3% (1)
• D
  3% (1)

Explanation

According to Oracle's documentation, ASM failure groups provide redundancy by storing mirror copies of data on different disks or storage servers. When ASM allocates an extent for a normal redundancy file, ASM allocates a primary copy and a secondary copy. ASM chooses the disk on which to store the secondary copy so that it is in a different failure group than the primary copy. This way, if one disk or storage server fails, ASM can still access the data from another failure group. Therefore, the statement that is true about how ASM failure groups provide redundancy is: Failure groups contain all ASM disks in a single storage server preventing mirror copies being written to the same storage server.

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