What is the difference between hp_tur and tur path checkers for device-mapper-multipath on Red Hat Enterprise Linux?

Solution Verified - Updated -

Issue

  • Starting RHEL 5.5, a new path checker was introduced: hp_tur. Have there been bugs reported on hp_tur when deviating from a standard tur option?
  • Can LUNs' WWID collision impact all types of HP storages?

Environment

  • Red Hat Enterprise Linux (RHEL), including:
    • Red Hat Enterprise Linux 5 (RHEL5)
    • Red Hat Enterprise Linux 6 (RHEL6)
  • device-mapper-multipath managing HP/Hitachi SAN's
  • Pathchecker is either tur (Test Unit Ready) or hp_tur.

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