multipath path flapping for hours after a one minute downtime

Solution Verified - Updated -

Issue

  • During firmware upgrades of SAN switches that when we lose a path, the path flaps between active and failed for many hours (up to 10+) afterwards.
  • Also, during this time, performance on the host is horrible. Commands hang, backups fail, etc..

Environment

  • RHEL 6.5 kernel version 2.6.32-431.29.2.el6.x86_64
  • device-mapper-multipath 0.4.9-72.el6_5.4.x86_64
  • EMC SYMMETRIX (Rev: 5874) external storage
  • Cisco UCS 6296UP switch running 5.0(3)N2(2.11.3c)
  • CISCO UCS blades with VIC FCoE HBAs (rev a2)
  • Default/built-in multipath.conf settings for SYMMETRIX (using TUR path_checker)

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