[dm-devel] multipathd ignoring dev_loss_tmo setting

[Benjamin Marzinski]

On Thu, Feb 28, 2019 at 11:38:22AM +0000, Martins, Bruno O wrote:
> Hello guys,
> 
> I am trying to modify /etc/multipath.conf on my system so that the
> parameter 'dev_loss_tmo' is changed from the default value.
> 
> However, when checking the value currently in use I am getting the
> wrong value (which is '30') for some of the remote ports:
>

Are you sure those rports are used by multipath devices? multipath only
changes dev_loss_tmo for rports associated with a multipath path device.

-Ben
 
> 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
> rport-4:0-0:0x5742b0f00007c500:10
> rport-4:0-1:0x5742b0f00007c500:10
> rport-4:0-2:0x5000097408369800:30
> rport-4:0-3:0x5742b0f00007c500:10
> rport-4:0-4:0x500009757804cbff:30
> rport-5:0-0:0x5742b0f00007c500:10
> rport-5:0-1:0x5742b0f00007c500:10
> rport-5:0-2:0x5742b0f00007c500:10
> rport-5:0-3:0x5000097408369800:30
> rport-5:0-4:0x500009757804cbff:30
> rport-6:0-0:0x5742b0f00007c500:10
> rport-6:0-1:0x5742b0f00007c500:10
> rport-6:0-2:0x5000097408369800:30
> rport-6:0-3:0x5742b0f00007c500:10
> rport-6:0-4:0x500009757804cbff: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        = "10"
>     dev_loss_tmo        = "10"
>     dev_loss_tmo        = "10"
>     dev_loss_tmo        = "10"
>     dev_loss_tmo        = "10"
>     dev_loss_tmo        = "10"
>     dev_loss_tmo        = "10"
>     dev_loss_tmo        = "10"
>     dev_loss_tmo        = "30"
>     dev_loss_tmo        = "10"
>     dev_loss_tmo        = "30"
>     dev_loss_tmo        = "30"
>     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
> 
> Thanks for your help!
> 
> Kind regards,
> 
> Bruno
> 
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