What is the usage of "eh_deadline" & "eh_timeout" and how is it related to scsi device timeout?

Solution Verified - Updated -

Issue

  • What is usage of eh_deadline & eh_timeout and how is it related to scsi device timeout?
  • What does it mean when I get an invalid arument error attempting to write to eh_deadline?

    echo 90 > /sys/devices/pci0000:00/0000:0e:00.0/host1/scsi_host/host1/eh_deadline
    echo: write error: Invalid argument
    

Environment

  • Red Hat Enterprise Linux 6.5+
  • kernel 2.6.32-431 or later

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