Oracle Exam 1Z0-902 Topic 10 Question 49 Discussion

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

Question #: 49
Topic #: 10

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 Lino at Sep 09, 2024, 12:09 AM

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Kandis

2 months ago

I'm just going to roll the dice and pick D. Who needs redundancy when you have 'extended' protection, right? *winks*

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Merri

29 days ago

User 3: I'm not so sure about that. I'll stick with B. Preventing mirror copies on the same storage server sounds more reliable to me.

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Timothy

1 months ago

User 2: I'll choose D. Extended Redundancy across data centers seems like the safest option for data protection.

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Donte

1 months ago

I think I'll go with A. Having mirror copies on the same storage server sounds like a good idea for faster recovery.

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Johnna

2 months ago

Option C is clearly a trap. ASM Flex instances have nothing to do with failure groups. B is the way to go, folks.

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Shonda

2 months ago

Wait, is this some kind of trick question? I'm going to go with B, but I have a feeling the test writers are trying to be sneaky.

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Arletta

2 months ago

D seems like it's trying to confuse me with the 'extended redundancy' bit. I'm going to stick with B as the best answer here.

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Kathryn

2 months ago

Option A sounds good, but I'm not sure if it's the most accurate description of how failure groups work. I'll go with B.

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Anjelica

1 months ago

User 3: I'm not sure about that, I think failure groups prevent mirror copies from being written to the same storage server. I'll go with option B.

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Felicitas

1 months ago

Carlene: Okay, I'll go with B as well. Thanks for the clarification!

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Shonda

1 months ago

I agree with Shonda, I think B is the correct option for how ASM failure groups provide redundancy.

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Carey

2 months ago

I agree, that's why I'm going with option A.

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Venita

2 months ago

I think failure groups are created to ensure mirror copies are written to the same storage server.

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Carlene

2 months ago

I'm not sure about that, I believe 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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Corinne

2 months ago

I think failure 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.

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