How does rr_min_io affect performance with device-mapper-multipath on Red Hat Enterprise Linux?

Solution Verified - Updated -

Issue

  • poor SAN IO perf on BL460 vs Solaris10
  • I/O throughput is not evenly balanced across all paths in a multipath device
  • Our SAN vendor requesting us to enforce rr_min_io from a standard 100 to 1000 (10x more). rr_min_io should not be dictated by storage manufacturer/maker should it?

Environment

  • Red Hat Enterprise Linux (RHEL) including:
    • Red Hat Enterprise Linux 5 (RHEL5)
    • Red Hat Enterprise Linux 6 (RHEL6)
  • device-mapper-multipath managing SAN-based storage with various values of rr_min_io.

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