A start-up firm is using the Amazon S3 file gateway to store on-premises data to AWS securely.
The Sysops Team needs to ensure that all cache data is properly uploaded to AWS so that in the event of a disaster there is no impact due to data loss.
Operations Lead needs you to share the percentage of data that is not uploaded to AWS. Which Amazon CloudWatch metric can be checked for this purpose?
Click on the arrows to vote for the correct answer
A. B. C. D.Correct Answer: C.
CachePercentDirty is an Amazon CloudWatch metric for Amazon S3 File Gateway which provides a percentage of the data not uploaded to AWS from local Cache.
This metric value should be near to zero to ensure all cache data is properly uploaded to AWS.
Option A is incorrect as CacheMissPercent is an invalid Amazon CloudWatch metric for the storage gateway.
Option B is incorrect as CacheHitPercent will provide a percentage of a read request handled by the cache.
This will not provide details of the content that is uploaded to AWS.
Option D is incorrect as CachePercentUsed will provide the percentage of the cache used.
It would not provide details of the content that is uploaded to AWS.
For more information on monitoring performance with Amazon Storage Gateway, refer to the following URL,
https://docs.aws.amazon.com/storagegateway/latest/userguide/Main_monitoring-gateways-common.html#PerfCache-commonThe metric that can be checked for determining the percentage of data that is not uploaded to AWS using the Amazon S3 file gateway is CachePercentDirty (option C).
CachePercentDirty is a CloudWatch metric that tracks the percentage of data in the file gateway's cache that has been modified but not yet uploaded to Amazon S3. When data is modified, it is marked as "dirty" until it is synchronized with the Amazon S3 bucket. If a disaster occurs before the dirty data is uploaded to S3, there is a risk of data loss.
The CacheMissPercent (option A) metric tracks the percentage of read requests that are not served by the file gateway's cache, requiring data to be fetched from Amazon S3. CacheHitPercent (option B) tracks the percentage of read requests that are served from the cache. These metrics are useful for monitoring the performance of the file gateway's cache but do not provide information about data that has not been uploaded to S3.
CachePercentUsed (option D) tracks the percentage of disk space used by the file gateway's cache. This metric is useful for monitoring the size of the cache and predicting when additional storage may be needed, but it does not provide information about data that has not been uploaded to S3.
Therefore, the correct answer is option C, CachePercentDirty. By monitoring this metric, the Sysops team can ensure that all cache data is properly uploaded to AWS, minimizing the risk of data loss in the event of a disaster.