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Exam AWS-SysOps topic 1 question 769 discussion

Exam question from Amazon's AWS-SysOps
Question #: 769
Topic #: 1
[All AWS-SysOps Questions]

A company is using AWS Storage Gateway to create block storage volumes and mount them as Internet Small Computer Systems Interface (iSCSI) devices from on-premises servers. As the Storage Gateway has taken on several new projects, some of the Development teams report that the performance of the iSCSI drives has degraded. When checking the Amazon CloudWatch metrics, a SysOps Administrator notices that the CacheHitPercent metric is below 60% and the
CachePercentUsed metric is above 90%.
What steps should the Administrator take to increase Storage Gateway performance?

  • A. Change the default block size for the Storage Gateway from 64 KB to 128 KB, 256 KB, or 512 KB to improve I/O performance.
  • B. Create a larger disk for the cached volume. In the AWS Management Console, edit the local disks, then select the new disk as the cached volume.
  • C. Ensure that the physical disks for the Storage Gateway are in a RAID 1 configuration to allow higher throughput.
  • D. Take point-in-time snapshots of all the volumes in Storage Gateway, flush the cache completely, then restore the volumes from the clean snapshots.
Show Suggested Answer Hide Answer
Suggested Answer: B 🗳️
by nicat at May 8, 2020, 3:33 a.m.
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nicat
Highly Voted 2 years, 7 months ago
B. Create a larger disk for the cached volume. In the AWS Management Console, edit the local disks, then select the new disk as the cached volume. https://docs.aws.amazon.com/storagegateway/latest/userguide/Main_monitoring-gateways-common.html
upvoted 8 times
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albert_kuo
Most Recent 9 months, 3 weeks ago
Selected Answer: B
Increasing the size of the cached volume helps to improve the cache hit rate and reduce cache congestion. By adding a larger disk, more data can be stored in the cache, increasing the chances of cache hits and improving overall performance.
upvoted 1 times
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abhishek_m_86
2 years, 6 months ago
B. Create a larger disk for the cached volume. In the AWS Management Console, edit the local disks, then select the new disk as the cached volume.
upvoted 3 times
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jackdryan
2 years, 6 months ago
I'll go with B
upvoted 1 times
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MFDOOM
2 years, 6 months ago
B. Create a larger disk for the cached volume. In the AWS Management Console, edit the local disks, then select the new disk as the cached volume.
upvoted 1 times
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JGD
2 years, 6 months ago
Why B..Storage Gateway, the configuration to be made at Onprem. if destination data I select then it would be S3, then why we are using larger Disk in AWS. for me correct answer is A, we need to increase block size for better IO in onprem.
upvoted 1 times
JGD
2 years, 6 months ago
B make sense. When adding cache or upload buffer to an existing gateway, it is important to create new disks in your host (hypervisor or Amazon EC2 instance). Don't change the size of existing disks if the disks have been previously allocated as either a cache or upload buffer. Do not remove cache disks that have been allocated as cache storage.
upvoted 2 times
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narayanan010
2 years, 7 months ago
Just trying to understand why this cannot be D? CacheHitPercentMetric is 60%, which is below the CachePercentUsed metric of 90%. Wouldn't a Flush and repopulation of the cache with updated data from the storage gateway help? Or is it because the difference between these is only 30%, which mandates an increase in cached volume disk size?
upvoted 2 times
MegatonN
2 years, 6 months ago
CacheHit tell us that we can found 60% of the needed info in the cache. We expect "100%", in // we have the info that we use 90% of the Cache space. Then to increase the Hit we need more data and to store more data we need to increase the Cache space. This means larger disk
upvoted 6 times
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jaribu
2 years, 6 months ago
With answer D you are bound to hit the same bottleneck again.
upvoted 2 times
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rewiga
2 years, 7 months ago
while i think this makes sense, i couldnt find any documentation to back it up
upvoted 1 times
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