Measuring Performance Between Your Tape Gateway and AWS - AWS Storage Gateway

Measuring Performance Between Your Tape Gateway and AWS

Data throughput, data latency, and operations per second are measures that you can use to understand how your application storage that is using your Tape Gateway is performing. When you use the correct aggregation statistic, these values can be measured by using the Storage Gateway metrics that are provided for you.

A statistic is an aggregation of a metric over a specified period of time. When you view the values of a metric in CloudWatch, use the Average statistic for data latency (milliseconds), and use the Samples 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.aws.amazon.com/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. For example, if the throughput from the Tape Gateway to AWS is 555,544,576 bytes for a given data point, and the period is 300 seconds, then the approximate throughput would be 1.85 megabytes per second.

To measure the data latency from a Tape Gateway to AWS

  1. Open the CloudWatch console at https://console.aws.amazon.com/cloudwatch/.

  2. Choose the Metrics tab.

  3. Choose the StorageGateway: GatewayMetrics dimension, and find the Tape Gateway that you want to work with.

  4. Choose the CloudDownloadLatency metric.

  5. For Time Range, choose a value.

  6. Choose the Average statistic.

  7. For Period, choose a value of 5 minutes to match the default reporting time.

The resulting time-ordered set of data points contains the latency in milliseconds.

To set an upper threshold alarm for a Tape Gateway's throughput to AWS

  1. Open the CloudWatch console at https://console.aws.amazon.com/cloudwatch/.

  2. Choose Create Alarm to start the Create Alarm wizard.

  3. Choose the StorageGateway: Gateway Metrics dimension, and find the Tape Gateway that you want to work with.

  4. Choose the CloudBytesUploaded metric.

  5. Define the alarm by defining the alarm state when the CloudBytesUploaded metric is greater than or equal to a specified value for a specified time. For example, you can define an alarm state when the CloudBytesUploaded metric is greater than 10 megabytes for 60 minutes.

  6. Configure the actions to take for the alarm state. For example, you can have an email notification sent to you.

  7. Choose Create Alarm.

To set an upper threshold alarm for reading data from AWS

  1. Open the CloudWatch console at https://console.aws.amazon.com/cloudwatch/.

  2. Choose Create Alarm to start the Create Alarm wizard.

  3. Choose the StorageGateway: Gateway Metrics dimension, and find the Tape Gateway that you want to work with.

  4. Choose the CloudDownloadLatency metric.

  5. Define the alarm by defining the alarm state when the CloudDownloadLatency metric is greater than or equal to a specified value for a specified time. For example, you can define an alarm state when the CloudDownloadLatency is greater than 60,000 milliseconds for greater than 2 hours.

  6. Configure the actions to take for the alarm state. For example, you can have an email notification sent to you.

  7. Choose Create Alarm.