Several modules without data

We have not received data from several agents for some time. According to the debugging log, the XML files are sent. I have checked that in the directory /var/spool/pandora/data_in there are 24675 files of type *.data, it is normal?

It is a clear case of XML queuing that the server is not able to process, it could have happened for several reasons, the most common ones are:

1. Pandora FMS server has stopped, from this moment it doesn’t process any XML.
   • Solution: Re-establish service /etc/init.d/pandora_server start .
2. The Pandora FMS server processes the slowest XML of the amount of these new ones coming in.
   • Solution: Spin up the number of threads to PFMS Data server, in the file /etc/pandora/pandora_serve.conf , modify the parameter dataserver_threads (increase threads).
3.  One or several agents have sent an important amount of XML in a short time, this is because the agents in their configuration file /etc/pandora/pandora_agent.conf have the parameter xml_buffer configured to 1, what does this parameter do?

What it does is to accumulate in the /tmp directory of the agent all the XML that it is NOT able to send to the pandora server due to, for example, server-agent connectivity problems. When this connectivity is recovered, it sends as many XML as it has generated in that time, so if this happens during a long time or with several agents at the same time, it could be that the Pandora FMS server receives an important amount of XML in a short time, and from there the queuing.

• • Solution: move the XML from the /var/spool/pandora/data_in of the server to a temporary directory, for example /tmp, and later put them little by little again in the /var/spool/pandora/data_in of the server to process them little by little.