Primary connection lost on higly loaded AC800M controller
We have one common network for Client and Control Networks. On this network (on primary TCP/IP A or CSA) there is a network hard drive where we keep backups. Usually when we copy big files (some GBs) through the network to the hard drive we receive "Primary Connection Lost" system message for some highly loaded AC800M controllers. What would you suggest? How can we solve it?
Voted best answer
>"We have one common network for Client and Control Networks."
You already know what the problem is. Theres no "magic" solution.
- Split the networks and stop copying large files over the control network.
- Reduce the CPU load on the controllers.
Remember, by using VLANs you can segment traffic between the Control Network and Client Network while still using the same switches.
I agree with Rob.
The "Connection Lost" alarm is raised when the Primary Aspect Server's RNRP service no longer receive the periodic (sent once per second) routing messages from a remote node (in this case a controller). In fact, three consecutive routing messages must go lost before the event is reported by RNRP.
If the network is truly switched, no traffic from the file transfer should reach the controller ports in the switch. If the file transfer is not involving the Primary Aspect Server, it too should be unaware of the file transfer.
This leaves us with a suspicion that the network and/or switches can not handle the file transfer without affecting other traffic going on over the network.
Have you studied the network statistics counters in the switches? Normally, switch-switch communication takes place over FULL DUPLEX and then there should be virtually no errors on any port of that link.
Maybe you have a faulty link between two switches?
If no link errors are seen, the problem is likely due to the switches unable to perform during high load.