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Exam AWS Certified Solutions Architect - Professional topic 1 question 236 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Professional

Question #: 236
Topic #: 1

[All AWS Certified Solutions Architect - Professional Questions]

Out of the striping options available for the EBS volumes, which one has the following disadvantage:
'Doubles the amount of I/O required from the instance to EBS compared to RAID 0, because you're mirroring all writes to a pair of volumes, limiting how much you can stripe.'?

A. Raid 1
B. Raid 0
C. RAID 1+0 (RAID 10)
D. Raid 2

Show Suggested Answer

Suggested Answer: C 🗳️
RAID 1+0 (RAID 10) doubles the amount of I/O required from the instance to EBS compared to RAID 0, because you're mirroring all writes to a pair of volumes, limiting how much you can stripe.
Reference:
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/raid-config.html

by ashendy at Sept. 27, 2020, 11:04 a.m.

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ashendy

Highly Voted 3 years, 9 months ago

Answer is RAID 1 The resulting size and bandwidth of a RAID 1 array is equal to the size and bandwidth of the volumes in the array. For example, two 500 GiB Amazon EBS io1 volumes with 4,000 provisioned IOPS each will create a 1000 GiB RAID 0 array with an available bandwidth of 8,000 IOPS and 1,000 MiB/s of throughput or a 500 GiB RAID 1 array with an available bandwidth of 4,000 IOPS and 500 MiB/s of throughput.

upvoted 8 times

EThandi

3 years, 7 months ago

Answer is 'C' as RAID 1 does not require twice the size of the required storage

upvoted 1 times

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amministrazione

Most Recent 10 months, 2 weeks ago

C. RAID 1+0 (RAID 10)

upvoted 1 times

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Sizuma

2 years, 10 months ago

C for sure

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Ddssssss

3 years, 1 month ago

Raid 1 AWS also supports RAID 1 on Amazon EBS volumes, which creates a greater fault tolerance capability, and makes it ideal for use cases where data durability is part of the requirement. However, it does not provide write performance improvement because the data is written to multiple volumes simultaneously. RAID 10 improves performance on non-optimized queries and large write volumes. RAID 10 is prohibitively expensive on a cost-to-performance ratio. Optimizing schema yields exponentially better return on investment than RAID 10. RAID 10 makes EBS snapshots impossible -- disabling simple disk backups.

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pititcu667

3 years, 5 months ago

Selected Answer: C

EBS volumes not regular volumes. By default ebs only supports raid 10 hence c.

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fais1985

3 years, 6 months ago

Answer should be A (Raid 1), as we are limiting the striping here Raid 0 is used for stripping Raid 10 does both Stripping & mirroring but expensive

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Madwyn

3 years, 8 months ago

C is correct as RAID 1 doesn't do stripping.

upvoted 2 times

01037

3 years, 8 months ago

Agreed

upvoted 1 times

Clandestine60

3 years, 4 months ago

I am guessing you mean stripping of parity bits?

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Clandestine60

3 years, 4 months ago

of course it does. Stripping literally means copying data across disks. Raid 1 does this but repeats stripped data on 2 disks thus creating replicas. Basically copying same data on 2 disks for backups

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M_Asep

3 years, 8 months ago

C is correct

upvoted 1 times

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aimar047

3 years, 8 months ago

Answer A

upvoted 1 times

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lostri

3 years, 9 months ago

Answer is A

upvoted 1 times

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