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Exam 3V0-624 topic 1 question 51 discussion

Actual exam question from VMware's 3V0-624
Question #: 51
Topic #: 1
[All 3V0-624 Questions]

A customer is deploying a mission-critical Oracle database with high SLA requirements, including high performance and high availability. The customer has chosen to purchase an All-Flash vSAN solution.
Which three storage policies should be used? (Choose three.)

  • A. RAID5/6 for data disk and RAID1 for OS disk with FTT=2
  • B. IOPS limit and checksum should be enabled.
  • C. RAID5/6 for OS disk and RAID1 for data disk with FTT=2
  • D. Configure multiple disk stripes.
  • E. Deduplication and Compression should be disabled.
Show Suggested Answer Hide Answer
Suggested Answer: ABE 🗳️
by VCAPito at Oct. 20, 2019, 9:21 a.m.

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VCAPito
Highly Voted 4 years, 6 months ago
Correct answer is BCE A) RAID 5/6 should be used for capacity, not performance (good for normal use case, but here high performance are required); B) IOPS limit should be enabled as switching path every few IO improve performance and reduce downtime should a path fail; C) RAID 1 preferred over RAID 5/6 for performance, required for data and log disks D) While having multiple disk stripes might generally improve performance, this is not the case with Oracle (see link below) E) Dedup and compression are good for capacity, but impact performance Some extra info here: https://storagehub.vmware.com/t/vmware-vsan/oracle-database-on-vmware-vsan-6-7/
upvoted 25 times
Meccy2020
3 years, 10 months ago
I agree with the answers ABE A - All flash means all quick, RAID is simply for data protection, so R1 for OS and R5/6 for Data
upvoted 5 times
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ianol
3 years, 4 months ago
BCE is correct The reason it's C and not A is because according to official docs - In case of latency-sensitive application, the recommendation is to use RAID 1 for Data disks https://core.vmware.com/resource/oracle-database-vmware-vsan-67#sec4-sub4
upvoted 1 times
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oud
Highly Voted 4 years, 1 month ago
I think C,d,e
upvoted 6 times
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chafik
Most Recent 3 years, 1 month ago
correct answer: BCE
upvoted 1 times
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Ophone
3 years, 5 months ago
BCE C: R1 is better performance than R5/6, Oracle has higher IO on Data than OS. VMware Oracle performance test: https://core.vmware.com/resource/oracle-database-vmware-vsan-67#sec4-sub4
upvoted 3 times
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noop
3 years, 5 months ago
ABD should be fine. https://core.vmware.com/resource/microsoft-sql-server-2014-vmware-vsan-62-all-flash#sec5-sub7
upvoted 1 times
Ophone
3 years, 5 months ago
Why look at MS SQL while the question about Oracle
upvoted 1 times
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LFC
3 years, 6 months ago
BCD The question is about Storage Policies. C is right about performance for data disk, therefore A is wrong. E is a cluster feature.
upvoted 4 times
Magneto
3 years ago
This is correct BCD: https://docs.vmware.com/en/VMware-Cloud-on-AWS/services/com.vmware.vsphere.vmc-aws-manage-data-center-vms.doc/GUID-EDBB551B-51B0-421B-9C44-6ECB66ED660B.html
upvoted 1 times
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lotso
3 years, 7 months ago
I think CDE. Oracle is a database. Data disk is more important than OS disk so Data is the one to get RAID 1. IOPS Shouldn't be limited. Let it use how much it needs
upvoted 4 times
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StarRaider
3 years, 7 months ago
CDE is the only logical answer
upvoted 3 times
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vcp555
3 years, 9 months ago
Answer is A, B, E as this doc also details, the stripe width for Oracle to remain at default 1 unless specific reason: https://storagehub.vmware.com/t/oracle-real-application-clusters-on-vmware-virtual-san/virtual-san-storage-configuration-guidelines-1/
upvoted 4 times
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vcp555
3 years, 9 months ago
A Is definitely a correct answer as this doc details Mirror for OS and RAID5 for Data: https://storagehub.vmware.com/t/oracle-database-on-vmware-vsan-6-7/vsan-configurations-used-in-this-solution/
upvoted 3 times
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Marcossss
3 years, 10 months ago
I agree with A B E
upvoted 3 times
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nu1
3 years, 11 months ago
BCE is correct?
upvoted 1 times
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pw_wijninga
3 years, 11 months ago
I agree with oud. It is recommended to not use multiple disk stripes for Oracle, because it doesn't provide a tangible benefit, however if performance issues are observed during the destaging process, then multiple stripes should be used. https://storagehub.vmware.com/t/oracle-database-12c-on-vmware-virtual-san-6-2-all-flash/best-practices-of-oracle-database-on-all-flash-virtual-san/ That is in itself is not a great motivator for including D in the answer, but B is much more likely to cause performance issues as IOPS limit is a hard limit: even when enough resources are available, they will not be used. https://cormachogan.com/2016/02/19/vsan-6-2-part-4-iops-limit/ Therefore: CDE
upvoted 5 times
Tequila_vSANrise
3 years, 7 months ago
"Therefore, it is recommended to use the default stripe width of 1 unless there are performance issues observed during the destaging process." so BCE, Cormac is not official documentation
upvoted 1 times
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