Dell Emulex Family of Adapters - Manual (Page 829)

Emulex Drivers Version 10.2 for Linux User Manual P010081-01A Rev. A
3. Configuration
FC and FCoE Driver Configuration
829
Persistent Configuration with modprobe.conf or lpfc.conf
For the FC RHEL5.x driver, to make the FC and FCoE driver parameters persist across
module loads and reboots, modify the /etc/modprobe.conf file. The FC and FCoE
driver parameters are specified in /etc/modprobe.conf via the “options” command.
For example, the following command sets the verbose flag:
options lpfc lpfc_log_verbose=0xffffffff
For FC RHEL6.x/SLES11-SPx drivers, to make the FC and FCoE driver parameters
persist across module loads and reboots, follow these two steps:
1. In the /etc/modprobe.d directory, create a file with the driver name “lpfc.conf”.
2. In /etc/modprobe.d/lpfc.conf, use the “options” command to add the appropriate
FC and FCoE driver parameters and their desired values. For example, adding the
following command to the lpfc.conf file sets the verbose flag:
options lpfc lpfc_log_verbose=0x3ffff
If driver parameters are modified in the modprobe.conf file or added to the lpfc.conf
file, the FC and FCoE driver must be reloaded for the parameters to take effect. Also, a
new ramdisk image is required if you want the changes to take effect in the next boot.
See “Creating a New Ramdisk Image” on page 830.
If the same parameter is specified on the modprobe command line and also in the
modprobe.conf or lpfc.conf file, then the value specified in the modprobe command
line takes precedence.
Configure Parameters with a Read/Write to sysfs
Sysfs is a virtual file system that exposes the structure of the system. It also includes
interfaces to driver parameters through which the FC and FCoE driver parameters can
be viewed and modified. Since these interfaces are available only after driver load, only
dynamic FC and FCoE driver parameters can be changed. However, both static and
dynamic FC and FCoE driver parameters can be read through sysfs.
Notes:

Sysfs changes exist only during driver load and are lost when the FC and FCoE
driver is unloaded or the system is rebooted.

Driver parameters that are set through module parameters are global; setting
them through sysfs is on a scsi host (adapter port) basis.
For example:
‘echo 0x7f >> /sys/class/scsi_host/host7/lpfc_log_verbose’ only affects host 7.
‘modprobe lpfc lpfc_log_verbose=0x7f’ will apply to all scsi host (ports)
managed by the lpfc driver.
Viewing Parameters with sysfs
The sysfs file system is mounted and available as /sys. You must first identify the
scsi_host that represents the adapter for which you want to modify the FC and FCoE