Apache CloudStack calls a series of (python) plugins on the XS host to assist with network and storage operations.
When the XS host is added to CloudStack, the python plugin scripts are copied (scp) to the XS host and installed on /etc/xapi.d/plugins.

These plugins are called via the Java methods in CitrixResourceBase.callHostPlugin*

The debug log for these plugins are in /var/log/SMlog on the XS host.
More details here: http://dlafferty.blogspot.com/2013/08/using-cloudstacks-log-files-xenserver.html

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