Oracle Exam 1Z0-902 Topic 4 Question 30 Discussion

Actual exam question for Oracle's 1Z0-902 exam

Question #: 30
Topic #: 4

How do ASM failure groups provide redundancy?

AFailure groups are created for each grid disk to ensure mirror copies are written to the same storage server for faster recovery after a physical disk failure.

BFailure groups contain all ASM disks in a single storage server preventing mirror copies being written to the same storage server.

CThey ensure that the ASM Flex instances are enabled on a maximum of two database servers or VMs per cluster.

DExtended Redundancy mirrors data across data centers providing the highest levels of data protection.

Show Suggested Answer

Suggested Answer: B

According to Oracle's documentation12, 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 copy1.This way, if one disk or storage server fails, ASM can still access the data from another failure group2.

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.

by Georgene at Nov 26, 2023, 02:40 AM

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