AWS Storage Gateway - Page 221

AWS Storage Gateway User Guide
Measuring Performance Between
Your Tape Gateway and AWS
statistic for input/output operations per second (IOPS). For more information, see Statistics in the
Amazon CloudWatch User Guide
The following table summarizes the metrics and the corresponding statistic you can use to measure the
throughput, latency, and IOPS between your tape gateway and AWS.
Item of Interest How to Measure
Latency Use the ReadTime and WriteTime metrics with the Average CloudWatch
statistic. For example, the Average value of the ReadTime metric gives you
the latency per operation over the sample period of time.
Throughput to AWS Use the CloudBytesDownloaded and CloudBytesUploaded metrics
with the Sum CloudWatch statistic. For example, the Sum value of the
CloudBytesDownloaded metric over a sample period of 5 minutes divided
by 300 seconds gives you the throughput from AWS to the tape gateway as a
rate in bytes per second.
Latency of data to
AWS
Use the CloudDownloadLatency metric with the Average statistic. For
example, the Average statistic of the CloudDownloadLatency metric gives
you the latency per operation.
To measure the upload data throughput from a tape gateway to AWS
1. Open the CloudWatch console at https://console.amazonaws.cn/cloudwatch/.
2. Choose the Metrics tab.
3. Choose the StorageGateway: Gateway Metrics dimension, and find the tape gateway that you want
to work with.
4. Choose the CloudBytesUploaded metric.
5. For Time Range, choose a value.
6. Choose the Sum statistic.
7. For Period, choose a value of 5 minutes or greater.
8. In the resulting time-ordered set of data points, divide each data point by the period (in seconds) to
get the throughput at that sample period.
The following image shows the CloudBytesUploaded metric for a gateway tape with the Sum statistic.
In the image, placing the cursor over a data point displays information about the data point, including
its value and the number of bytes uploaded. Divide this value by the Period value (5 minutes) to get the
throughput at that sample point. For the point highlighted, the throughput from the tape gateway to
AWS is 555,544,576 bytes divided by 300 seconds, which is 1.7 megabytes per second.
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