NPIV I/O hangs when a single path fails in multipath - RHEL 5.5 - Red Hat Customer Portal

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Issue

NPIV I/O hangs when a single path fails in multipath

Environment

Red Hat Enterprise Linux 5.5 (RHEL 5.5) installed on a multipath device
IBM Power Systems Power 6- or Power 7- based system
System is partitioned using VIOS
NPIV capable adapter (8Gb FC adapter)
Multipath configuration to one or more SAN targets connected via NPIV using dm-multipath
NPIV FC adapter is assigned to VIOS and has ports configured and assigned to one or more Linux LPARs
fast_io_fail_tmo on the FC rports set to 5 seconds

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