Unable to set custom 'dev_loss_tmo' value in RHEL7

Solution Verified - Updated -

Issue

  • The value of dev_loss_tmo is set to 20 but still getting the 50 in the output of below command:

    $ less /etc/multipath.conf
[...]
defaults {
        user_friendly_names     yes
        fast_io_fail_tmo        10
        dev_loss_tmo            20   ###
}
[...]

$ for f in /sys/class/fc_remote_ports/rport-*/dev_loss_tmo; do d=$(dirname $f); echo $(basename $d):$(cat $d/node_name):$(cat $f); done
rport-7:0-2:0x50020e8020144afa:50   <---
rport-7:0-3:0x50020e8020144af2:50   <---
rport-8:0-2:0x50020e8020144afb:50   <---
rport-8:0-3:0x50020e8020144af3:50   <---

  • How is the value of dev_loss_tmo calculated in RHEL 7 ?

Environment

  • Red Hat Enterprise Linux 7.2

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