Cisco Cisco Email Security Appliance C390 ユーザーガイド

RAM utilization should always be less than 75%. If RAM utilization exceeds 
75%, 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 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 75%. The allowed injection rate for this system will be 

gradually decreased as RAM utilization approaches 85%.

This situation occurs only with an aggressive injection with poor 
deliverability facilities. If you encounter RAM utilization exceeding 75%, 
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 IronPort Customer Support. See 

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 

. Use these commands: 

deleterecipients

bouncerecipients

redirectrecipients

suspenddel

 / 

resumedel

suspendlistener

 / 

resumelistener