Changing the timeout value for the FC transport class

You can change the timeout value for the Fibre Channel (FC) transport class when the I/O operation stalls.

The FC transport class keeps all outstanding I/O for a certain time until it determines that the remote port is not responding. This time period is controlled by the timeout value. The default time is 60 seconds. This situation causes a temporary I/O stall in the case of FC link incidents or when paths are varied offline.

Change the timeout value.

Set the timeout value for each remote port by using the sysfs file system.
```
/sys/class/fc_remote_ports/rport-0:0-0/dev_loss_tmo
```
Preset the timeout value for all remote ports when you load the scsi_transport_fc module by using the dev_loss_tmo parameter.