RMC communication to VIOS is busy or timed out
There are several issues that can cause Resource Monitoring and Control (RMC) connection problems.
RMC communication issue
If you are getting error messages in PowerVC while an RMC connection runs on Virtual I/O Servers, then there might be a configuration issue. You might see error messages that indicate the following information: RMC communication timed out on the Virtual I/O Servers, Virtual I/O servers are too busy to process the request, or RMC is in a busy state.
- Network Configuration
- If the wrong DNS or host lookup information is provided, then it can cause the Virtual I/O Servers to have a slow response.
- Fibre Channel Configuration
- If the Fibre Channel port connection is not configured properly, then the
lsnportscommand on the Virtual I/O Servers can take a long time. When the
lsnportscommand delays, it can potentially cause other requests to time out.
To resolve this issue, validate your VIOS network and storage configuration.
Performing many concurrent migrations causes RMC to shut down
Performing many concurrent migrations can cause the RMC connection to be moved to Inactive state. In that case, the deployed virtual machines will also be in Inactive state in PowerVC. Additionally, other operations that rely on the RMC connection will fail.
This is a known problems in HMC versions earlier than 8.5.0.
The RMC connection should start running again when the activity slows. At that point, the virtual machines should come out of Inactive state.