Performance

Checks if your Amazon DynamoDB tables and global secondary indexes have auto scaling or on-demand enabled.

Amazon DynamoDB auto scaling uses the Application Auto Scaling service to dynamically adjust provisioned throughput capacity on your behalf in response to actual traffic patterns. This enables a table or a global secondary index to increase its provisioned read and write capacity to handle sudden increases in traffic, without throttling. When the workload decreases, Application Auto Scaling decreases the throughput so that you don't pay for unused provisioned capacity.

You can adjust the check configuration using the parameters in your Amazon Config rules.

For more information, see Managing throughput capacity automatically with DynamoDB auto scaling.

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Amazon Config Managed Rule: dynamodb-autoscaling-enabled

Yellow: Auto scaling is not enabled for your DynamoDB tables and/or global secondary indexes.

Unless you already have a mechanism to automatically scale the provisioned throughput of your DynamoDB table and/or the global secondary indexes based on your workload requirement, consider turning on auto scaling for your Amazon DynamoDB tables.

For more information, see Using the Amazon Web Services Management Console with DynamoDB auto scalingp.

Managing throughput capacity automatically with DynamoDB auto scaling

Checks if Amazon EBS optimization is enabled for your Amazon EC2 instances.

An Amazon EBS–optimized instance uses an optimized configuration stack and provides additional, dedicated capacity for Amazon EBS I/O. This optimization provides the best performance for your Amazon EBS volumes by minimizing contention between Amazon EBS I/O and other traffic from your instance..

For more information, see Amazon EBS–optimized instances.

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Amazon Config Managed Rule: ebs-optimized-instance

Yellow: Amazon EBS optimization is not enabled on supported Amazon EC2 instances.

Turn on Amazon EBS optimization on supported instances.

For more information, see Enable EBS optimization at launch.

Amazon EBS–optimized instances

Checks for Provisioned IOPS (SSD) volumes that are attached to an Amazon EBS optimizable Amazon Elastic Compute Cloud (Amazon EC2) instance that is not EBS-optimized.

Provisioned IOPS (SSD) volumes in the Amazon Elastic Block Store (Amazon EBS) are designed to deliver the expected performance only when they are attached to an EBS-optimized instance.

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Yellow: An Amazon EC2 instance that can be EBS-optimized has an attached Provisioned IOPS (SSD) volume but the instance is not EBS-optimized.

Create a new instance that is EBS-optimized, detach the volume, and reattach the volume to your new instance. For more information, see Amazon EBS-Optimized Instances and Attaching an Amazon EBS Volume to an Instance.

Checks the Amazon Elastic Block Store (Amazon EBS) volumes that were running at any time during the lookback period. This check alerts you if any EBS volumes were under-provisioned for your workloads. Consistent high utilization can indicate optimized, steady performance, but can also indicate that an application does not have enough resources.

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Yellow: An EBS Volume that was under-provisioned during the lookback period. To determine if a volume is under-provisioned, we consider all default CloudWatch metrics (including IOPS and throughput). The algorithm used to identify under-provisioned EBS volumes follows Amazon Web Services best practices. The algorithm is updated when a new pattern has been identified.

Consider upsizing volumes that have high utilization.

For more information, see Opt in Amazon Compute Optimizer for Trusted Advisor checks.

Checks the Amazon Elastic Compute Cloud (Amazon EC2) instances that were running at any time during the last 14 days. An alert is sent if daily CPU utilization was greater than 90% on four or more days.

Consistent high utilization can indicate optimized, steady performance. However, it can also indicate that an application does not have enough resources. To get daily CPU utilization data, download the report for this check.

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Yellow: An instance had more than 90% daily average CPU utilization on at least 4 of the previous 14 days.

Consider adding more instances. For information about scaling the number of instances based on demand, see What is Auto Scaling?

Checks for EC2 instances that have a large number of security group rules. Performance can be degraded if an instance has a large number of rules.

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Yellow: An EC2-VPC instance has more than 50 security group rules.

Yellow: An EC2-Classic instance has more than 100 security group rules.

Reduce the number of rules associated with an instance by deleting unnecessary or overlapping rules. For more information, see Deleting Rules from a Security Group.

EC2 Security Groups

Checks each Amazon Elastic Compute Cloud (Amazon EC2) security group for an excessive number of rules.

If a security group has a large number of rules, performance can be degraded.

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Yellow: An Amazon EC2-VPC security group has more than 50 rules.

Yellow: An Amazon EC2-Classic security group has more than 100 rules.

Reduce the number of rules in a security group by deleting unnecessary or overlapping rules. For more information, see Amazon EC2 security groups for your EC2 instances.

Checks for Amazon Elastic Block Store (Amazon EBS) magnetic volumes that are potentially over-utilized and might benefit from a more efficient configuration.

A magnetic volume is designed for applications with moderate or bursty input/output (I/O) requirements, and the IOPS rate is not guaranteed. It delivers approximately 100 IOPS on average, with a best-effort ability to burst to hundreds of IOPS. For consistently higher IOPS, you can use a Provisioned IOPS (SSD) volume. For bursty IOPS, you can use a General Purpose (SSD) volume. For more information, see Amazon EBS Volume Types.

For a list of instance types that support EBS-optimized behavior, see Amazon EBS-Optimized Instances.

To get daily utilization metrics, download the report for this check. The detailed report shows a column for each of the last 14 days. If there is no active EBS volume, the cell is empty. If there is insufficient data to make a reliable measurement, the cell contains N/A. If there is sufficient data, the cell contains the daily median and the percentage of the variance in relation to the median (for example, 256 / 20%)

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Yellow: An Amazon EBS magnetic volume is attached to an instance that can be EBS-optimized or is part of a cluster compute network with a daily median of more than 95 IOPS, and varies by less than 10% of the median value for at least 7 of the past 14 days.

For consistently higher IOPS, you can use a Provisioned IOPS (SSD) volume. For bursty IOPS, you can use a General Purpose (SSD) volume. For more information, see Amazon EBS Volume Types.