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AsyncOS 9.1.2 for Cisco Email Security Appliances User Guide

Chapter 40 Testing and Troubleshooting

Troubleshooting Performance

If you suspect that there are there are performance problems with the appliance, utilize the following

strategies:

• Use the rate and hostrate commands to check the current system activity.

The

rate command returns real-time monitoring information about email operations. For more

information, see Displaying Real-time Activity, page 34-16.

The

hostrate command returns real-time monitoring information for a specific host.

• Use the status command to cross-check the historical rates to check for degradation.

• Use the status detail command to check the RAM utilization.

You can use the

status detail command to quickly see the system’s RAM, CPU, and Disk I/O

utilization.

Note RAM utilization should always be less than 45%. If RAM utilization exceeds 45%, then, the appliance

will enter “resource conservation mode;” it initiates a “back-off” algorithm to prevent over-subscription

of resources and sends out the following email alert:

This situation occurs only with an aggressive injection with poor deliverability facilities. If you

encounter RAM utilization exceeding 45%, check the number of messages in the queue and see if a

particular domain is down or unavailable for delivery (via the

hoststatus or hostrate commands).

Also check the status of the system and ensure that delivery is not suspended. If after stopping the

injection you continue to experience a high RAM utilization, contact Cisco Customer Support. See

Cisco Customer Support, page 1-3.

• Is the problem specific to one domain?

Use the

tophosts command to get immediate information about the email queue and determine if a

particular recipient domain has delivery problems.

Check the size of the queue. You can delete, bounce, suspend, or redirect messages in the email

queue to manage its size, or to deal with recipients to a specific, problematic domain. For more

information, see Managing the Email Queue, page 34-22. Use these commands:

–

deleterecipients

–

bouncerecipients

TLS successfully connected to mxe.example.com.

TLS verification completed.

This system (hostname: hostname) has entered a 'resource conservation' mode in order to

prevent the rapid depletion of critical system resources.

RAM utilization for this system has exceeded the resource conservation threshold of 45%.

The allowed injection rate for this system will be gradually decreased as RAM

utilization approaches 60%.