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15 Scalability and performance of Dell EMC OpenManage Essentials version 2.5
8 Alerts and task management
Recommendations for using the system update feature based on the analysis of the test results:
• Domain Name System (DNS) must be configured such that OME is able to resolve the hostname and
all the received alerts. If the name resolution in OME is not successful, the alerts or events are
received and processed at a slower rate.
• From the test data collected, OME can process alerts at the rate of 1/second. If the alert frequency
increases, the performance of OME will be slower. Alert actions might not always be triggered at a
higher alert frequency.
• Alert actions must be created for the required severity and category such that all alerts are not
processed by the created alert action. This will enhance the performance of OME. For example, if an
alert action is to be created for all critical network alerts, the Critical option must be selected under
Severity Association, and the Network option must be selected under Category and Sources
Association.
• In case of an events storm, where more than 20000 alerts are generated at the same time, OME drops
about 1% alerts after receiving 20000 alerts. This happens while the old alerts are getting purged.
OME receives all the alerts generated without dropping any if alerts are received at a rate of 30
alerts/min without any alerts actions configured, and 9 alerts/sec with all the alerts actions configured.
Table 7 lists an overall data about the size consumed by alerts when received in OME. Note, the OME
configuration used is as per the enterprise configuration requirement in Table 1.
Table 8: OME DB size after receiving the alerts
Initial DB Size after Installing OME
113 MB
DB Size After Discovering 8000 devices
(WS-Man)
847 MB
DB Size After Receiving 2000 Alerts
848 MB
DB Size After Receiving 20000 Alerts
852 MB
DB Size After Receiving 40000 Alerts
857 MB
Task management
• The recommended number of managed targets for a single remote task is 40.
• Schedule no more than 20 remote tasks to run simultaneously.
• The Server Administrator deployment task must be run with a maximum of 20 managed system
targets. For Linux target systems, use of operating system-specific Dell EMC OpenManage Server
Administrator packages are recommended.
• Separate remote tasks must be created for Windows and Linux managed systems.