How can I check that multipath round-robin IO is taking place?

Solution Unverified - Updated -

Issue

  • How can I check that multipath round-robin IO is taking place?
  • How can I verify that multipath is using round-robin to access each path in turn and therefore load balancing the data throughput?

Environment

  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 5
  • device-mapper-multipath

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