Best practices when trying to restart EM in APM Cluster
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Best practices when trying to restart EM in APM Cluster


Article ID: 245199


Updated On:


CA Application Performance Management (APM / Wily / Introscope)


Is there any advice to take into account when trying to restart the EM on the MOM?

Is a common procedure or do we have to avoid it as much as possible because it can cause problems?


Release : 10.7.0

Component :EM


Documentation: Best Practice of starting / restarting of MOM and Collectors. 


a) Use the available startup script
b) Allow the EM to gracefully stop. 
DO NOT try to stop and start the EMs (MOM and Collectors) immediately as the Java process can still be running.
It could end with 2 process running and 2nd reporting messages such as "port in use" and potentially a smartstor data corruption.
After running ./EMCtl stop, check that and ensure the java process is not running, you can also use ./ status
c) It is always recommended to start the Collectors before the MOM to avoid overloading MOM, but there is also a risk of overloading Collector that were started first if the Agents were not restarted.
As a best practice, you should start all Collectors at the same time and then the MOM.