Multi-node RSM ARC fails jobs when adding more than 1 compute node

- February 23, 2023 at 7:42 pm
  
  Tomas Gintautas
  Subscriber
  
  I have set up a compute cluster with 1 head node and multiple compute nodes underneath using centos7.9 (essentianlly this):
  If I use a queue that contains only one compute node, all calculations go thorugh fine, the moment I add additional nodes to the queue, I start getting this error (with scratch directory set in HPC Side File Management):
  Failed to create working directory on execution nodes via node share/mount.
  ClusterJobs Command Exit Code: 1004
  If I set HPC staging dir in HPC Side File Management, jobs still do not go thoruhg, but the error is different (it hangs at this stage):
  Running Process
  Running Solver : /mnt/resource/ansys_install/v221/ansys/bin/ansys221 -b nolist -s noread -apip off -p meba -i remote.dat -o solve.out -dis -machines af99a381cd6f419783359a34da1f218b000000:8:af99a381cd6f419783359a34da1f218b000001:8 -dir "/mnt/resource/batch/tasks/fsmounts/R/ep30uf1s.w4g"
  Host key verification failed.
  Furthermore, the model calcs fail regardless of RSM test from RSM config gui passing with green tick-mark...
  Does anyone have ideas? What am I missing? the credentials are cached withj arccredentials on master node (and on compute nodes), paswordless SSH is set-up across the cluster.
  Thanks!
- March 8, 2023 at 1:28 pm
  
  George Karnos
  Ansys Employee
  
  The error message:
  Host key verification failed.
  Points to a passwordless SSH issue.
  Test that across the cluster machines.

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