What is the state of KSM/THP? Did you try disabling them ? I've seen these can cause high iowait (although that was a virtual environment). It would be interesting to see vmstat output. tail /sys/kernel/mm/ksm/run /sys/kernel/mm/transparent_hugepage/khugepaged/defrag /sys/kernel/mm/transparent_hugepage/enabled /sys/kernel/mm/transparent_hugepage/defrag https://www.postgresql.org/message-id/20170718180152.GE17566%40telsasoft.com I realize the postgres params don't seem related to the difference between local/remote/NFS, but did you see all these ? https://www.postgresql.org/docs/current/populate.html Justin
