Poor write performance with large files on Gluster EC volume

Solution In Progress - Updated -

Issue

On a distributed iozone benchmark test involving sequential writes to large-files, we are seeing poor write throughput when there are multiple threads per client. Stats on the clients show a glusterfs thread at 100% CPU utilization. Overall CPU utilization on the clients is low.

Environment

  • glusterfs*-3.8.0-1.el7.x86_64 (on both clients and servers)
  • RHEL 7.1 (clients)
  • RHEL 7.2 (servers)

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