from time to time I got the following error message when querying sensor / sdr informations from the iDRAC6 on R610-11g and R710-11G.
Get Session Challenge command failed: Node busy Error: Unable to establish LAN session Get Device ID command failed Unable to open SDR for reading
I updated iDRAC6 firmware from 1.71 to 1.80 and 1.85 but the error still occurs.
I also use Zabbix Network Monitoring for monitoring several sensors of these servers. Zabbix log mentions "network errors" and tries to reconnect 15 sec later.
I tried to figure out where this problem comes from and also posted in Zabbix Support forum: https://support.zabbix.com/browse/ZBX-3243
In the iDRAC Webinterface I saw under "iDRAC settings -> Properties -> iDRAC-Informations -> Integrated Dell Remote Access Controller 6 - Enterprise"
the attribute "Number of possible active sessions" has a value of "5".
Does this mean that ONLY five simultanious sessions via IPMI (Lan) to the BMC are possible ?
Network monitoring systems try to query many sensor data in parallel. This restriction would make it impossible to query data in nearly-real-time.
On the other hand the NMS should only establish one session and query the sensor data in this single session.
Is there a workaround or is it possible to change the "max sessions" value ?