On 02/28/2019 12:38 PM, Martins, Bruno O wrote:
I am trying to modify /etc/multipath.conf on my system so that the
parameter 'dev_loss_tmo' is changed from the default value.
My multipath.conf file contains the following:
defaults {
no_path_retry "fail"
queue_without_daemon "no"
checker_timeout 15
flush_on_last_del "no"
user_friendly_names "yes"
fast_io_fail_tmo 5
dev_loss_tmo 10
}
If I'm not mistaken, the default settings could be overridden by (built-in)
device section settings.
However, in your case, where you see some rports having your desired setting
but others not, it looks like it's due to multipath-tools only setting the
_tmo's for those rports where it has paths it manages in path groups.
So if you don't have multipath managed paths behind e.g.
rport-3:0-3:0x5000097408369800 it remains to use the rport's default tmo coming
from scsi_transport_fc in the kernel.
If so, we typically don't care for those "unmanaged" ports.
However, when checking the value currently in use I am getting the
wrong value (which is '30') for some of the remote ports:
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-3:0-0:0x5742b0f00007c500:10
rport-3:0-1:0x5742b0f00007c500:10
rport-3:0-2:0x5742b0f00007c500:10
rport-3:0-3:0x5000097408369800:30
rport-3:0-4:0x500009757804cbff:30
systool is giving me the same information:
systool -c fc_remote_ports -v | grep dev_loss_tmo
dev_loss_tmo = "10"
dev_loss_tmo = "30"
dev_loss_tmo = "10"
dev_loss_tmo = "30"
dev_loss_tmo = "30"
dev_loss_tmo = "30"
dev_loss_tmo = "30"
Where is this value coming from? May this be a bug? I couldn't find
anything useful on the Internet regarding this.
I am using the following versions:
rpm -qa multipath-tools
multipath-tools-0.4.9-109.1
uname -a
Linux mysystem 3.0.101-63-default #1 SMP Tue Jun 23 16:02:31 UTC 2015
(4b89d0c) x86_64 x86_64 x86_64 GNU/Linux
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Mit freundlichen Gruessen / Kind regards
Steffen Maier
Linux on IBM Z Development
https://www.ibm.com/privacy/us/en/
IBM Deutschland Research & Development GmbH
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