Limiting path failover time for SCSI devices

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Issue

A storage fault causes the SCSI error handler (scsi_eh) threads to spend a long time attempting to recover before failing over to other available paths.

Environment

Red Hat Enterprise Linux 5.10.z kernel kernel-2.6.18-371.6.1.el5 or newer
Red Hat Enterprise Linux 6.4.z kernel kernel-2.6.32-358.32.3.el6 or newer
SCSI devices in a multipath configuration
Storage faults that cause IO to time out on external storage
Red Hat Enterprise Linux 7

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