Cisco Cisco Email Security Appliance C170 Betriebsanweisung
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User Guide for AsyncOS 10.0 for Cisco Email Security Appliances
Chapter 29 Using Email Security Monitor
Email Security Monitor Pages
The system capacity page can be used to determine the following information:
•
Identify when a appliance is exceeding recommended capacity and configuration optimization or
additional appliances are needed.
additional appliances are needed.
•
Identify historical trends in system behavior which point to upcoming capacity issues.
•
Identify which part of the system is using the most resources to assist with troubleshooting.
It is important to monitor your appliance to ensure that your capacity is appropriate to your message
volumes. Over time, volume will inevitably rise and appropriate monitoring will ensure that additional
capacity or configuration changes can be applied proactively. The most effective way to monitor system
capacity is to track overall volume, messages in the work queue and incidents of Resource Conservation
Mode.
volumes. Over time, volume will inevitably rise and appropriate monitoring will ensure that additional
capacity or configuration changes can be applied proactively. The most effective way to monitor system
capacity is to track overall volume, messages in the work queue and incidents of Resource Conservation
Mode.
•
Volume: It is important to have an understanding of the “normal” message volume and the “usual”
spikes in your environment. Track this data over time to measure volume growth. You can use the
Incoming Mail and Outgoing Mail pages to track volume over time. For more information, see
spikes in your environment. Track this data over time to measure volume growth. You can use the
Incoming Mail and Outgoing Mail pages to track volume over time. For more information, see
and
.
•
Work Queue: The work queue is designed to work as a “shock absorber”-- absorbing and filtering
spam attacks and processing unusual increases in ham messages. However, the work queue is also
the best indicator of a system under stress, prolonged and frequent work queue backups may indicate
a capacity problem. You can use the WorkQueue page to track the average time messages spend in
the work queue and the activity in your work queue. For more information, see
spam attacks and processing unusual increases in ham messages. However, the work queue is also
the best indicator of a system under stress, prolonged and frequent work queue backups may indicate
a capacity problem. You can use the WorkQueue page to track the average time messages spend in
the work queue and the activity in your work queue. For more information, see
.
•
Resource Conservation Mode: When a appliance becomes overloaded, it will enter “Resource
Conservation Mode” (RCM) and send a CRITICAL system alert. This is designed to protect the
device and allow it to process any backlog of messages. Your appliance should enter RCM
infrequently and only during a very large or unusual increase in mail volume. Frequent RCM alerts
may be an indication that the system is becoming overloaded. See
Conservation Mode” (RCM) and send a CRITICAL system alert. This is designed to protect the
device and allow it to process any backlog of messages. Your appliance should enter RCM
infrequently and only during a very large or unusual increase in mail volume. Frequent RCM alerts
may be an indication that the system is becoming overloaded. See
Related Topics
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System Capacity- Workqueue
The Workqueue page shows the average time a message spends in the work queue, excluding any time
spent in the Spam quarantine or in a policy, virus, or outbreak quarantine. You can view time periods
from an hour up to one month. This average can help in identifying both short term events delaying mail
delivery and identify long term trends in the workload on the system.
spent in the Spam quarantine or in a policy, virus, or outbreak quarantine. You can view time periods
from an hour up to one month. This average can help in identifying both short term events delaying mail
delivery and identify long term trends in the workload on the system.
Note
If a message is released from the quarantine into the work queue, the “average time in work queue”
metric ignores this time. This prevents double-counting and distorted statistics due to extended time
spent in a quarantine.
metric ignores this time. This prevents double-counting and distorted statistics due to extended time
spent in a quarantine.