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Question 128 - Associate Cloud Engineer discussion

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You have an application on a general-purpose Compute Engine instance that is experiencing excessive disk read throttling on its Zonal SSD Persistent Disk. The application primarily reads large files from disk. The disk size is currently 350 GB. You want to provide the maximum amount of throughput while minimizing costs. What should you do?

A.
Increase the size of the disk to 1 TB.
Answers
A.
Increase the size of the disk to 1 TB.
B.
Increase the allocated CPU to the instance.
Answers
B.
Increase the allocated CPU to the instance.
C.
Migrate to use a Local SSD on the instance.
Answers
C.
Migrate to use a Local SSD on the instance.
D.
Migrate to use a Regional SSD on the instance.
Answers
D.
Migrate to use a Regional SSD on the instance.
Suggested answer: C

Explanation:

Standard persistent disks are efficient and economical for handling sequential read/write operations, but they aren't optimized to handle high rates of random input/output operations per second (IOPS). If your apps require high rates of random IOPS, use SSD persistent disks. SSD persistent disks are designed for single-digit millisecond latencies. Observed latency is application specific.

Local SSDs

Local SSDs are physically attached to the server that hosts your VM instance. Local SSDs have higher throughput and lower latency than standard persistent disks or SSD persistent disks. The data that you store on a local SSD persists only until the instance is stopped or deleted. Each local SSD is 375 GB in size, but you can attach a maximum of 24 local SSD partitions for a total of 9 TB per instance.

Performance

Local SSDs are designed to offer very high IOPS and low latency. Unlike persistent disks, you must manage the striping on local SSDs yourself. Combine multiple local SSD partitions into a single logical volume to achieve the best local SSD performance per instance, or format local SSD partitions individually.

Local SSD performance depends on which interface you select. Local SSDs are available through both SCSI and NVMe interfaces.

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asked 18/09/2024
Ibrahim SACCA
38 questions
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