Communication Link Establishment Error: ucp_ep_create(...)failed: Destination is unreachable

Symptom

The MPI process returns the following error information during communication link establishment:

ucp_ep_create(peer proc=0 peer hostname=6426-node125) failed: Destination is unreachable

Possible Cause

The link establishment request from the ep cannot reach the peer end due to network problems.

Recovery Procedure

• View the error logs except the ucp_ep_create error log and search for the corresponding section in this chapter based on the error log information.
• If the error information can be found in this chapter, go to the corresponding section and rectify the fault.
• If the error information cannot be found in this chapter, the name of the peer node is printed in the ucp_ep_create error log. Check whether the network configuration and NIC configuration of the two nodes are correct.